To analyze the seismic response of steel structure isolation systems under long-period seismic motion,a 9-story steel frame building was selected as the subject.Five steel structure finite element models were establis...To analyze the seismic response of steel structure isolation systems under long-period seismic motion,a 9-story steel frame building was selected as the subject.Five steel structure finite element models were established using SAP2000.Response spectrum analysis was conducted on the seismic motion to determine if it adhered to the characteristics of long-period seismic motion.Modal analysis of each structural model revealed that the isolation structure significantly prolonged the structural natural vibration period and enhanced seismic performance.Base reactions and floor displacements of various structures notably increased under long-period seismic motion compared to regular seismic activity.Placing isolation bearings in the lower part of the structure proved more effective under long-period seismic motion.In seismic design engineering,it is essential to consider the impact of long-period seismic motion on structures and the potential failure of isolation bearings.展开更多
During the construction of prefabricated building engineering, the quality of prefabricated building engineering is often affected by various internal and external factors which affect the sustainable development of t...During the construction of prefabricated building engineering, the quality of prefabricated building engineering is often affected by various internal and external factors which affect the sustainable development of the construction industry. With the advancement of Science and technology, the perfection of industrial chain and the improvement and innovation of architectural design concept, combined with the advantages of steel structure " light, convenient, smart and fast ", the development of fabricated steel structure in residential area is worth popularizing. Therefore, we should make great efforts to popularize the assembled steel structure housing in the urban construction level and promote the housing industrialization development, so as to realize the common development of our countrys housing industrys economic and social benefits.展开更多
With the continuous improvement of China's science and technology, the design method of steel structure is also more and more, how to better apply the module building design method to the related buildings, is the...With the continuous improvement of China's science and technology, the design method of steel structure is also more and more, how to better apply the module building design method to the related buildings, is the current issue to focus on consideration. Therefore, this paper will focus on the design method of multi-layer steel structure module and steel frame composite building structure, and analyze and study its structure, so as to improve the utilization rate of steel structure and promote the development of the construction industry.展开更多
Paint removal from steel structure is executed for shipyards of marine and offshore engineering.Due to environmental unfriendliness and unhealthy drawbacks of sand blasting technique, laser ablation technique is propo...Paint removal from steel structure is executed for shipyards of marine and offshore engineering.Due to environmental unfriendliness and unhealthy drawbacks of sand blasting technique, laser ablation technique is proposed as a substituting method.By absorbing high energy of the 1064 nm pulsed laser, the paint is vaporized quickly.The ablated debris is then collected by using a suction pump.Initial metal surface of the steel is exposed when laser beam irradiates perpendicularly and scans over it.The cleaned surface fulfills the requirements of surface preparation standards ISO 8501 of SA2.The adhesion is further characterized with pull-off test after carrying out painting with Jotamastic 87 aluminum paint.The repainting can be embedded onto the laser cleaned surface to bond much more tightly.The excellent adhesion strength of 20 MPa between repainted coating and the substrate is achieved, which is higher than what is required by shipyards applications.展开更多
Steel structure system of crane deteriorates over time due to environmental effects, material fatigue, and overloading. System structural reliability and remaining service life assessment methods are developed during ...Steel structure system of crane deteriorates over time due to environmental effects, material fatigue, and overloading. System structural reliability and remaining service life assessment methods are developed during the few decades. But until now estimating remaining service life methods of crane steel system by reliability theory begin to develop. Safety assessment of existing steel structure system requires the development of a methodology that allows for an accurate evaluation of reliability and prediction of the remaining life. Steel structures are the supporting elements in the special equipment such as hoisting machinery. Structure reliability and remaining service life safe assessment are important for steel structures. For finding the reason which caused the failure modes （such as fatigue strength failure, stiffness failure and stability failure）, incremental loading method based on possibilistic reliability is applied into dynamic structure failure path research. Through reliability analyzing and calculating for crane, it is demonstrated that fatigue damage is the most common failure mode. Fuzzy fatigue damage accumulation theory is used for basis theory and Paris-Eadogan equations are used for mathematical modeling. All fatigue parameter values of the welding box girder of bridge cranes are determined and fatigue remaining life formulas are deduced. After field test and collecting working parameters of numerous cranes, typical fatigue load spectrum was compiled for the dangerous point of box girders used in the area. Fatigue remaining life is assessed for different types and lifting capacities. Safety for steel structure system of bridge crane is assessed by two quantitative indexs： reliability and remaining life. Therefore, the evaluation means is more comprehensive and reasonable. The example shows that the two quantitative indexs are mutually correlated. Through analyzing the 120 t-22.5 m bridge crane of a certain enterprise, a new methodology to estimate remaining service life of steel structure by possibilistic reliability theory is introduced for safety evaluation of structure system.展开更多
In order to establish the baseline finite element model for structural health monitoring,a new method of model updating was proposed after analyzing the uncertainties of measured data and the error of finite element m...In order to establish the baseline finite element model for structural health monitoring,a new method of model updating was proposed after analyzing the uncertainties of measured data and the error of finite element model.In the new method,the finite element model was replaced by the multi-output support vector regression machine(MSVR).The interval variables of the measured frequency were sampled by Latin hypercube sampling method.The samples of frequency were regarded as the inputs of the trained MSVR.The outputs of MSVR were the target values of design parameters.The steel structure of National Aquatic Center for Beijing Olympic Games was introduced as a case for finite element model updating.The results show that the proposed method can avoid solving the problem of complicated calculation.Both the estimated values and associated uncertainties of the structure parameters can be obtained by the method.The static and dynamic characteristics of the updated finite element model are in good agreement with the measured data.展开更多
To examine the seismic performance of a newly fabricated weakened joint at the beam end position,four groups of energy-consuming steel plates with different weakening depths and thicknesses were subjected to horizonta...To examine the seismic performance of a newly fabricated weakened joint at the beam end position,four groups of energy-consuming steel plates with different weakening depths and thicknesses were subjected to horizontal cyclic reciprocating loading tests on beam ends.The tests were designed to evaluate the beams'hysteresis curve,skeleton curve,bearing capacity degradation curve,stiffness degradation curve,and ductility and the nodes'energy dissipation capacity.The test results show that a newly fabricated joint will not undergo brittle damage when the beam-column joint is welded at a displacement of 105 mm.Thus,the hysteresis curve will show an inverse S shape,and an obvious slip phenomenon will occur,which is mainly due to splicing.The diameter of the bolt connecting the slab to the beam flange is slightly smaller than the aperture.Due to the existence of slippage,the skeleton curve has no evident yield point.The joint ductility coefficient is less than 3.0,and the initial rotational stiffness of the joint is also small.The buckling of the splicing panel causes a rapid decrease in the joint bearing capacity.The main approaches,appropriately reducing the weakening depth and increasing the thickness of the splicing plate,can delay the occurrence of buckling and improve the ductility of the joint.展开更多
Nowadays,the scope of bridge construction projects in China is becoming wider,which promotes China's economic development to a large extent and also improves China's transportation system.Meanwhile,people also...Nowadays,the scope of bridge construction projects in China is becoming wider,which promotes China's economic development to a large extent and also improves China's transportation system.Meanwhile,people also put forward new requirements for the quality of steel structure bridges.However,in actual design,due to the influence of many fectors,some problems are inevitable,which will affect the integrity of the design.Therefore,the designer needs to fully grasp the possible design problems,and then take efiective measures to improve the integrity of the design scheme,so as to ensure the quality of the steel structure bridge and improves the safety of the steel structure bridge from the fundamentals.This paper mainly focuses on steel structure bridges,analyzed the current status of steel structure bridge types and their selection,and proposes the integrity design strategy of steel structure bridges.展开更多
he virtual erection simulation system was explained for a steel structure including ship and ocean plant blocks. The simulation system predicted the erection state to optimize any gap or overlap of blocks based on 3-D...he virtual erection simulation system was explained for a steel structure including ship and ocean plant blocks. The simulation system predicted the erection state to optimize any gap or overlap of blocks based on 3-D measurement data. The blocks were modified （cut） on the basis of the simulation result on the ground before erecting them by crane. The re-cutting process was not required and the blocks were erected into a mother ship speedily. Therefore, the erection time is reduced, increasing the dock turnover.展开更多
Modern public buildings, such as multiplex cinemas and theaters, along with application of state of the art sound effects bring high acoustic insulation demands. Cinemas are often a part of building complexes such as ...Modern public buildings, such as multiplex cinemas and theaters, along with application of state of the art sound effects bring high acoustic insulation demands. Cinemas are often a part of building complexes such as shopping malls with subjects that produce serious level of noise and vibrations. Apart to regular use of polyurethane in thermal insulation purposes, it is widely used in field of acoustic insulation. Usage of polyurethane foam pads, with specific dynamic characteristics, as a base for structure supports gives a wide range of possibilities in controlling the amount of structural noise and vibrations transferred to the structure. Structure itself and acoustical pads becomes an integral system that behaves together and need to be analyzed as a whole in extensive design. Dynamic characteristics of acoustic pads depend on stress level and in same time they represent elastic supports to the structure and therefore analyzes and design is an iterative process. In other way, introduce of non-conventional material in bearing structure brings some issues, such as transfer of shear forces, that has to be governed by proper structural detailing. There are several possibilities of application in bearing structures, such as above and below steel structure. This paper gives an overall view on polyurethane as material, construction and design principles and example of usage of acoustic pads in steel structure of＂Ster＂ cineplex in Belgrade.展开更多
<div style="text-align:justify;"> In this paper, perlite was used as a kind of modifier to prepare waterborne fire resistive coatings for steel structure. The influence of perlite on the properties of ...<div style="text-align:justify;"> In this paper, perlite was used as a kind of modifier to prepare waterborne fire resistive coatings for steel structure. The influence of perlite on the properties of the fire resistive coatings was investigated with the help of thermogravimetric analysis (TGA), micro-scale combustion calorimetry (MCC) and fire protection test. The TGA results showed that the char residue weight of the coatings was increased when perlite was loaded and the anti-oxidation performance was enhanced as well and MCC data indicated the addition of perlite reduced the peak heat release rate and total heat release. After the fire protection test, the results confirmed that the fire resistant time of the coating coated with 5 wt% perlite increased up to 114.4 min when the temperature of the sample boards’ backside reached 500?C. </div>展开更多
Considering the distribution law of the steel columns and bifurcated supports of the fan-shaped roof, the general idea of construction is to install the intermediate structural beam through the temporary supports, the...Considering the distribution law of the steel columns and bifurcated supports of the fan-shaped roof, the general idea of construction is to install the intermediate structural beam through the temporary supports, then connect with the steel columns to form a stable whole, and then install them to the outside in turn by radiation, and monitor the unloading process. The construction quality of the single-layer curved reticulated shell steel roof is ensured, and the installation of the reticulated shell steel roof is successfully completed.展开更多
With the acceleration of urbanization, the scale of super high-rise buildings in China continues to expand. As one of the main structural forms of super high-rise buildings, steel structure has the advantages of high ...With the acceleration of urbanization, the scale of super high-rise buildings in China continues to expand. As one of the main structural forms of super high-rise buildings, steel structure has the advantages of high strength, light weight and strong seismic resistance. Therefore, it is of great significance to study the steel structure construction technology of super high-rise buildings. In this paper, the design principles of building steel structure are expounded, the design principles and design problems are analyzed, and the stability design points and stability calculation methods of building steel structure are studied. Therefore, a stable design method that can improve the quality of construction projects is obtained, in order to provide reference for construction enterprises and promote the development of China's construction industry.展开更多
The steel structure of the Chengmen Building of Anyi County Vocational Education is a single-span 65.55m truss structure. In order to ensure the safety of the construction process, reduce aerial work, and ensure the w...The steel structure of the Chengmen Building of Anyi County Vocational Education is a single-span 65.55m truss structure. In order to ensure the safety of the construction process, reduce aerial work, and ensure the welding quality and construction progress of the chord and web members of the main truss, the integral hoisting method is used for construction. At present, there are few similar projects in China. In order to study the stress-displacement state during the integral hoisting and installation of the main truss, a simulation model is established based on Midas/Civil finite element software. The assembly, hoisting and installation of the main truss are studied in three stages to find out where the maximum stress value and the maximum displacement value appear, and to summarize the change rules of stress and displacement, so as to ensure that the maximum stress and the maximum displacement are within a controllable range during the integral hoisting and installation construction process of the truss, which can meet the design requirements and ensure the construction safety.展开更多
Through a series of steel column processing control measures, such as automatic cutting and blanking, U-shaped assembly, BOX assembly, CO2 backing weld, submerged arc automatic welding, the construction accuracy of la...Through a series of steel column processing control measures, such as automatic cutting and blanking, U-shaped assembly, BOX assembly, CO2 backing weld, submerged arc automatic welding, the construction accuracy of large steel box column is improved. Through the construction accuracy control of key process of box column on-site installation, the accurate positioning and installation of steel box column is ensured. The welding deformation problem is well solved through the verification of the solid engineering construction. This experience has a great reference value for steel box column processing and construction accuracy control.展开更多
With the wide application and promotion of steel structure in China, the technical problems of complex structure construction are increasingly prominent. Combined with the mechanics and key technical points in structu...With the wide application and promotion of steel structure in China, the technical problems of complex structure construction are increasingly prominent. Combined with the mechanics and key technical points in structural mechanics, relevant designers effectively analyze the technical difficulties that need to be solved in the overall construction and installation process of steel structure. Taking a construction project as an example, this paper analyzes the difficulties and key points in the construction of the project, and on this basis, analyzes the implementation requirements and control key points of the main processes in the construction of the project, such as vertical/horizontal truss hoisting, high-altitude welding, metal curtain wall installation, etc., and puts forward corresponding measures, so as to provide reference for the implementation of such projects.展开更多
Prefabricated steel structure residence refers to the residential system constructed by uniform and standard steel members and transported to the construction site. The traditional construction method is that people d...Prefabricated steel structure residence refers to the residential system constructed by uniform and standard steel members and transported to the construction site. The traditional construction method is that people do a lot of on-site construction such as steel binding, formwork support and concrete pouring. The carbon emission is very serious, which damages the surrounding environment and causes serious pollution problems in urban construction. Compared with traditional residential structures, prefabricated steel structure residence has high strength and light weight. With the advantages of flexible design and layout, large space for effective use, high degree of integration, good economic benefits, etc., and recyclable steel, it is green and environmentally friendly, which meets the requirements of the national sustainable development strategy, and is widely promoted in modern residential buildings. This paper focuses on taking Beijing Dongao Village Talent Public Rental Housing Project as an example, summarizing and analyzing the characteristics, structural composition and characteristic practices in the construction process of prefabricated steel structure houses.展开更多
With the further deepening of the sustainable development strategy of China's construction industry, steel structure workshop has been more widely used in construction projects, especially in engineering construct...With the further deepening of the sustainable development strategy of China's construction industry, steel structure workshop has been more widely used in construction projects, especially in engineering construction. It has become a widely used form in the construction of factory buildings, and is also an important manifestation of the technological upgrading and popularization of China's contemporary construction industry. However, due to the influence of many aspects in the construction of steel structure workshop, there are still many uncontrollable constraints in its construction process. Therefore, it is necessary to carry out in-depth analysis on the construction process of steel structure workshop, and explore the assembly construction process of steel structure workshop and its quality control measures.展开更多
With the rapid development of China's market economy, especially in the process of urbanization, a large number of civil engineering projects have sprung up, which has laid a solid foundation for the improvement o...With the rapid development of China's market economy, especially in the process of urbanization, a large number of civil engineering projects have sprung up, which has laid a solid foundation for the improvement of the country's comprehensive strength and people's quality of life. In the process of steel structure construction, it is necessary to strengthen the application, management and control in strict accordance with the corresponding construction technology control points, so as to ensure the construction safety and quality. To promote the development of construction engineering, it is necessary to analyze the technology of concrete and steel structure engineering as a whole, improve the level of construction technology, and promote the stable development of construction engineering.展开更多
In recent years, China has stepped up its efforts to open its economy to the outside world, thus effectively promoting the sound development of the social economy and creating a good foundation for the development and...In recent years, China has stepped up its efforts to open its economy to the outside world, thus effectively promoting the sound development of the social economy and creating a good foundation for the development and expansion of the field of science and technology. As a result, a large number of new technologies have been developed and widely used by people in many fields with good results. Especially in the civil engineering industry, the continuous improvement of engineering construction technology has laid a solid foundation for the continuous improvement of civil engineering construction quality. At present, China's urbanization construction has been widely implemented, and the number of civil construction projects in various regions has gradually increased, which makes people put forward higher requirements on the construction technology level of construction projects. Steel structure is an important part in civil engineering projects. The construction effect of steel structure is often closely related to the construction quality of civil engineering projects, and it is also an important foundation for the sustainable and stable development of civil engineering industry. In view of this, this article mainly focuses on the comprehensive and in-depth research and analysis of steel structure construction technology in civil engineering construction, hoping to be helpful for the future good development of the civil engineering industry in our country.展开更多
基金Anhui Province Young and Middle-aged Teacher Training Action Excellent Young Teacher Cultivation Project(YQYB2023162)Anhui University Natural Science Research Key Project(KJ2021A1410)Special Topic of the Higher Education Institution Scientific Research Development Center of the Ministry of Education(ZJXF2022080)。
文摘To analyze the seismic response of steel structure isolation systems under long-period seismic motion,a 9-story steel frame building was selected as the subject.Five steel structure finite element models were established using SAP2000.Response spectrum analysis was conducted on the seismic motion to determine if it adhered to the characteristics of long-period seismic motion.Modal analysis of each structural model revealed that the isolation structure significantly prolonged the structural natural vibration period and enhanced seismic performance.Base reactions and floor displacements of various structures notably increased under long-period seismic motion compared to regular seismic activity.Placing isolation bearings in the lower part of the structure proved more effective under long-period seismic motion.In seismic design engineering,it is essential to consider the impact of long-period seismic motion on structures and the potential failure of isolation bearings.
文摘During the construction of prefabricated building engineering, the quality of prefabricated building engineering is often affected by various internal and external factors which affect the sustainable development of the construction industry. With the advancement of Science and technology, the perfection of industrial chain and the improvement and innovation of architectural design concept, combined with the advantages of steel structure " light, convenient, smart and fast ", the development of fabricated steel structure in residential area is worth popularizing. Therefore, we should make great efforts to popularize the assembled steel structure housing in the urban construction level and promote the housing industrialization development, so as to realize the common development of our countrys housing industrys economic and social benefits.
文摘With the continuous improvement of China's science and technology, the design method of steel structure is also more and more, how to better apply the module building design method to the related buildings, is the current issue to focus on consideration. Therefore, this paper will focus on the design method of multi-layer steel structure module and steel frame composite building structure, and analyze and study its structure, so as to improve the utilization rate of steel structure and promote the development of the construction industry.
基金supported by the National Natural Science Foundation of China (U1609209)National Natural Science Foundation of China (61605162)+2 种基金NSFC-Liaoning Province united foundation (U1608259)National Natural Science Foundation of China (51501219)the financial support from the China Scholarship Council
文摘Paint removal from steel structure is executed for shipyards of marine and offshore engineering.Due to environmental unfriendliness and unhealthy drawbacks of sand blasting technique, laser ablation technique is proposed as a substituting method.By absorbing high energy of the 1064 nm pulsed laser, the paint is vaporized quickly.The ablated debris is then collected by using a suction pump.Initial metal surface of the steel is exposed when laser beam irradiates perpendicularly and scans over it.The cleaned surface fulfills the requirements of surface preparation standards ISO 8501 of SA2.The adhesion is further characterized with pull-off test after carrying out painting with Jotamastic 87 aluminum paint.The repainting can be embedded onto the laser cleaned surface to bond much more tightly.The excellent adhesion strength of 20 MPa between repainted coating and the substrate is achieved, which is higher than what is required by shipyards applications.
基金supported by National Scientific and Technological Support Projects during the 11th Five-Year Plan Period (Grant No. 2006BAK02B04)Shanxi Provincial Youth Science and Technology Research Fund of China (Grant No. 2006021029)+2 种基金Shanxi Provincial Natural Science Foundation of China (Grant No. 2008011043-1)Shanxi Provincial High-tech Industrialization Project of China (Grant No20090020)Doctor Fund of Taiyuan University of Science and Technology of China (Grant No. 20092005)
文摘Steel structure system of crane deteriorates over time due to environmental effects, material fatigue, and overloading. System structural reliability and remaining service life assessment methods are developed during the few decades. But until now estimating remaining service life methods of crane steel system by reliability theory begin to develop. Safety assessment of existing steel structure system requires the development of a methodology that allows for an accurate evaluation of reliability and prediction of the remaining life. Steel structures are the supporting elements in the special equipment such as hoisting machinery. Structure reliability and remaining service life safe assessment are important for steel structures. For finding the reason which caused the failure modes （such as fatigue strength failure, stiffness failure and stability failure）, incremental loading method based on possibilistic reliability is applied into dynamic structure failure path research. Through reliability analyzing and calculating for crane, it is demonstrated that fatigue damage is the most common failure mode. Fuzzy fatigue damage accumulation theory is used for basis theory and Paris-Eadogan equations are used for mathematical modeling. All fatigue parameter values of the welding box girder of bridge cranes are determined and fatigue remaining life formulas are deduced. After field test and collecting working parameters of numerous cranes, typical fatigue load spectrum was compiled for the dangerous point of box girders used in the area. Fatigue remaining life is assessed for different types and lifting capacities. Safety for steel structure system of bridge crane is assessed by two quantitative indexs： reliability and remaining life. Therefore, the evaluation means is more comprehensive and reasonable. The example shows that the two quantitative indexs are mutually correlated. Through analyzing the 120 t-22.5 m bridge crane of a certain enterprise, a new methodology to estimate remaining service life of steel structure by possibilistic reliability theory is introduced for safety evaluation of structure system.
基金Project(50678052) supported by the National Natural Science Foundation of China
文摘In order to establish the baseline finite element model for structural health monitoring,a new method of model updating was proposed after analyzing the uncertainties of measured data and the error of finite element model.In the new method,the finite element model was replaced by the multi-output support vector regression machine(MSVR).The interval variables of the measured frequency were sampled by Latin hypercube sampling method.The samples of frequency were regarded as the inputs of the trained MSVR.The outputs of MSVR were the target values of design parameters.The steel structure of National Aquatic Center for Beijing Olympic Games was introduced as a case for finite element model updating.The results show that the proposed method can avoid solving the problem of complicated calculation.Both the estimated values and associated uncertainties of the structure parameters can be obtained by the method.The static and dynamic characteristics of the updated finite element model are in good agreement with the measured data.
基金The National Natural Science Foundation of China(No.51968043,51978320).
文摘To examine the seismic performance of a newly fabricated weakened joint at the beam end position,four groups of energy-consuming steel plates with different weakening depths and thicknesses were subjected to horizontal cyclic reciprocating loading tests on beam ends.The tests were designed to evaluate the beams'hysteresis curve,skeleton curve,bearing capacity degradation curve,stiffness degradation curve,and ductility and the nodes'energy dissipation capacity.The test results show that a newly fabricated joint will not undergo brittle damage when the beam-column joint is welded at a displacement of 105 mm.Thus,the hysteresis curve will show an inverse S shape,and an obvious slip phenomenon will occur,which is mainly due to splicing.The diameter of the bolt connecting the slab to the beam flange is slightly smaller than the aperture.Due to the existence of slippage,the skeleton curve has no evident yield point.The joint ductility coefficient is less than 3.0,and the initial rotational stiffness of the joint is also small.The buckling of the splicing panel causes a rapid decrease in the joint bearing capacity.The main approaches,appropriately reducing the weakening depth and increasing the thickness of the splicing plate,can delay the occurrence of buckling and improve the ductility of the joint.
文摘Nowadays,the scope of bridge construction projects in China is becoming wider,which promotes China's economic development to a large extent and also improves China's transportation system.Meanwhile,people also put forward new requirements for the quality of steel structure bridges.However,in actual design,due to the influence of many fectors,some problems are inevitable,which will affect the integrity of the design.Therefore,the designer needs to fully grasp the possible design problems,and then take efiective measures to improve the integrity of the design scheme,so as to ensure the quality of the steel structure bridge and improves the safety of the steel structure bridge from the fundamentals.This paper mainly focuses on steel structure bridges,analyzed the current status of steel structure bridge types and their selection,and proposes the integrity design strategy of steel structure bridges.
基金supported by the Korea Institute of Marine Science & Technology promotion (KIMST)
文摘he virtual erection simulation system was explained for a steel structure including ship and ocean plant blocks. The simulation system predicted the erection state to optimize any gap or overlap of blocks based on 3-D measurement data. The blocks were modified （cut） on the basis of the simulation result on the ground before erecting them by crane. The re-cutting process was not required and the blocks were erected into a mother ship speedily. Therefore, the erection time is reduced, increasing the dock turnover.
文摘Modern public buildings, such as multiplex cinemas and theaters, along with application of state of the art sound effects bring high acoustic insulation demands. Cinemas are often a part of building complexes such as shopping malls with subjects that produce serious level of noise and vibrations. Apart to regular use of polyurethane in thermal insulation purposes, it is widely used in field of acoustic insulation. Usage of polyurethane foam pads, with specific dynamic characteristics, as a base for structure supports gives a wide range of possibilities in controlling the amount of structural noise and vibrations transferred to the structure. Structure itself and acoustical pads becomes an integral system that behaves together and need to be analyzed as a whole in extensive design. Dynamic characteristics of acoustic pads depend on stress level and in same time they represent elastic supports to the structure and therefore analyzes and design is an iterative process. In other way, introduce of non-conventional material in bearing structure brings some issues, such as transfer of shear forces, that has to be governed by proper structural detailing. There are several possibilities of application in bearing structures, such as above and below steel structure. This paper gives an overall view on polyurethane as material, construction and design principles and example of usage of acoustic pads in steel structure of＂Ster＂ cineplex in Belgrade.
文摘<div style="text-align:justify;"> In this paper, perlite was used as a kind of modifier to prepare waterborne fire resistive coatings for steel structure. The influence of perlite on the properties of the fire resistive coatings was investigated with the help of thermogravimetric analysis (TGA), micro-scale combustion calorimetry (MCC) and fire protection test. The TGA results showed that the char residue weight of the coatings was increased when perlite was loaded and the anti-oxidation performance was enhanced as well and MCC data indicated the addition of perlite reduced the peak heat release rate and total heat release. After the fire protection test, the results confirmed that the fire resistant time of the coating coated with 5 wt% perlite increased up to 114.4 min when the temperature of the sample boards’ backside reached 500?C. </div>
文摘Considering the distribution law of the steel columns and bifurcated supports of the fan-shaped roof, the general idea of construction is to install the intermediate structural beam through the temporary supports, then connect with the steel columns to form a stable whole, and then install them to the outside in turn by radiation, and monitor the unloading process. The construction quality of the single-layer curved reticulated shell steel roof is ensured, and the installation of the reticulated shell steel roof is successfully completed.
文摘With the acceleration of urbanization, the scale of super high-rise buildings in China continues to expand. As one of the main structural forms of super high-rise buildings, steel structure has the advantages of high strength, light weight and strong seismic resistance. Therefore, it is of great significance to study the steel structure construction technology of super high-rise buildings. In this paper, the design principles of building steel structure are expounded, the design principles and design problems are analyzed, and the stability design points and stability calculation methods of building steel structure are studied. Therefore, a stable design method that can improve the quality of construction projects is obtained, in order to provide reference for construction enterprises and promote the development of China's construction industry.
文摘The steel structure of the Chengmen Building of Anyi County Vocational Education is a single-span 65.55m truss structure. In order to ensure the safety of the construction process, reduce aerial work, and ensure the welding quality and construction progress of the chord and web members of the main truss, the integral hoisting method is used for construction. At present, there are few similar projects in China. In order to study the stress-displacement state during the integral hoisting and installation of the main truss, a simulation model is established based on Midas/Civil finite element software. The assembly, hoisting and installation of the main truss are studied in three stages to find out where the maximum stress value and the maximum displacement value appear, and to summarize the change rules of stress and displacement, so as to ensure that the maximum stress and the maximum displacement are within a controllable range during the integral hoisting and installation construction process of the truss, which can meet the design requirements and ensure the construction safety.
文摘Through a series of steel column processing control measures, such as automatic cutting and blanking, U-shaped assembly, BOX assembly, CO2 backing weld, submerged arc automatic welding, the construction accuracy of large steel box column is improved. Through the construction accuracy control of key process of box column on-site installation, the accurate positioning and installation of steel box column is ensured. The welding deformation problem is well solved through the verification of the solid engineering construction. This experience has a great reference value for steel box column processing and construction accuracy control.
文摘With the wide application and promotion of steel structure in China, the technical problems of complex structure construction are increasingly prominent. Combined with the mechanics and key technical points in structural mechanics, relevant designers effectively analyze the technical difficulties that need to be solved in the overall construction and installation process of steel structure. Taking a construction project as an example, this paper analyzes the difficulties and key points in the construction of the project, and on this basis, analyzes the implementation requirements and control key points of the main processes in the construction of the project, such as vertical/horizontal truss hoisting, high-altitude welding, metal curtain wall installation, etc., and puts forward corresponding measures, so as to provide reference for the implementation of such projects.
文摘Prefabricated steel structure residence refers to the residential system constructed by uniform and standard steel members and transported to the construction site. The traditional construction method is that people do a lot of on-site construction such as steel binding, formwork support and concrete pouring. The carbon emission is very serious, which damages the surrounding environment and causes serious pollution problems in urban construction. Compared with traditional residential structures, prefabricated steel structure residence has high strength and light weight. With the advantages of flexible design and layout, large space for effective use, high degree of integration, good economic benefits, etc., and recyclable steel, it is green and environmentally friendly, which meets the requirements of the national sustainable development strategy, and is widely promoted in modern residential buildings. This paper focuses on taking Beijing Dongao Village Talent Public Rental Housing Project as an example, summarizing and analyzing the characteristics, structural composition and characteristic practices in the construction process of prefabricated steel structure houses.
文摘With the further deepening of the sustainable development strategy of China's construction industry, steel structure workshop has been more widely used in construction projects, especially in engineering construction. It has become a widely used form in the construction of factory buildings, and is also an important manifestation of the technological upgrading and popularization of China's contemporary construction industry. However, due to the influence of many aspects in the construction of steel structure workshop, there are still many uncontrollable constraints in its construction process. Therefore, it is necessary to carry out in-depth analysis on the construction process of steel structure workshop, and explore the assembly construction process of steel structure workshop and its quality control measures.
文摘With the rapid development of China's market economy, especially in the process of urbanization, a large number of civil engineering projects have sprung up, which has laid a solid foundation for the improvement of the country's comprehensive strength and people's quality of life. In the process of steel structure construction, it is necessary to strengthen the application, management and control in strict accordance with the corresponding construction technology control points, so as to ensure the construction safety and quality. To promote the development of construction engineering, it is necessary to analyze the technology of concrete and steel structure engineering as a whole, improve the level of construction technology, and promote the stable development of construction engineering.
文摘In recent years, China has stepped up its efforts to open its economy to the outside world, thus effectively promoting the sound development of the social economy and creating a good foundation for the development and expansion of the field of science and technology. As a result, a large number of new technologies have been developed and widely used by people in many fields with good results. Especially in the civil engineering industry, the continuous improvement of engineering construction technology has laid a solid foundation for the continuous improvement of civil engineering construction quality. At present, China's urbanization construction has been widely implemented, and the number of civil construction projects in various regions has gradually increased, which makes people put forward higher requirements on the construction technology level of construction projects. Steel structure is an important part in civil engineering projects. The construction effect of steel structure is often closely related to the construction quality of civil engineering projects, and it is also an important foundation for the sustainable and stable development of civil engineering industry. In view of this, this article mainly focuses on the comprehensive and in-depth research and analysis of steel structure construction technology in civil engineering construction, hoping to be helpful for the future good development of the civil engineering industry in our country.
