A newnumerical method based on vector form intrinsic finite element（VFIFE） is proposed to simulate the integral lifting process of steel structures. First, in order to verify the validity of the VFIFE method, taking...A newnumerical method based on vector form intrinsic finite element（VFIFE） is proposed to simulate the integral lifting process of steel structures. First, in order to verify the validity of the VFIFE method, taking the steel gallery between the integrated building and the attached building of Nanjing M obile Communication Buildings for example, the static analysis was carried out and the corresponding results were compared with the results achieved by the traditional finite element method. Then, according to the characteristics of dynamic construction of steel structure integral lifting, the tension cable element was employed to simulate the behavior of dynamic construction. The VFIFE method avoids the iterative solution of the stiffness matrix and the singularity problems. Therefore, it is simple to simulate the complete process of steel structure lifting construction.Finally, by using the VFIFE, the displacement and internal force time history curves of the steel structures under different lifting speeds are obtained. The results show that the lifting speed has influence on the lifting force, the internal force, and the displacement of the structure. In the case of normal lifting speed, the dynamic magnification factor of 1. 5 is safe and reasonable for practical application.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
In recent years, in order to implement the national green development requirements and implement the sustainable development strategy, the traditional wooden formwork and steel pipe scaffold can no longer meet the req...In recent years, in order to implement the national green development requirements and implement the sustainable development strategy, the traditional wooden formwork and steel pipe scaffold can no longer meet the requirements of energy conservation and environmental protection. With the increasingly fierce competition in the housing construction industry, the construction period and cost are continuously reduced. Under the dual pressure of national policy and market environment, the combined construction of aluminum alloy formwork and integrated attached lifting scaffold is timely and shows significant advantages. The combination of the aluminum formwork and the climbing frame is beneficial to the interpenetration of working procedures, the structure, decoration and outdoor works are carried out simultaneously, the construction waste is reduced, the cost of civilized measures is saved, the safety factor of operators is high, the aluminum formwork adopts a quick dismantling system, the construction period is saved, the rigidity of the aluminum formwork is large, the concrete forming quality is good, the turnover times are large, and the recycling value is high.展开更多
基金The National Natural Science Foundation of China(No.51308105)
文摘A newnumerical method based on vector form intrinsic finite element（VFIFE） is proposed to simulate the integral lifting process of steel structures. First, in order to verify the validity of the VFIFE method, taking the steel gallery between the integrated building and the attached building of Nanjing M obile Communication Buildings for example, the static analysis was carried out and the corresponding results were compared with the results achieved by the traditional finite element method. Then, according to the characteristics of dynamic construction of steel structure integral lifting, the tension cable element was employed to simulate the behavior of dynamic construction. The VFIFE method avoids the iterative solution of the stiffness matrix and the singularity problems. Therefore, it is simple to simulate the complete process of steel structure lifting construction.Finally, by using the VFIFE, the displacement and internal force time history curves of the steel structures under different lifting speeds are obtained. The results show that the lifting speed has influence on the lifting force, the internal force, and the displacement of the structure. In the case of normal lifting speed, the dynamic magnification factor of 1. 5 is safe and reasonable for practical application.
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In recent years, in order to implement the national green development requirements and implement the sustainable development strategy, the traditional wooden formwork and steel pipe scaffold can no longer meet the requirements of energy conservation and environmental protection. With the increasingly fierce competition in the housing construction industry, the construction period and cost are continuously reduced. Under the dual pressure of national policy and market environment, the combined construction of aluminum alloy formwork and integrated attached lifting scaffold is timely and shows significant advantages. The combination of the aluminum formwork and the climbing frame is beneficial to the interpenetration of working procedures, the structure, decoration and outdoor works are carried out simultaneously, the construction waste is reduced, the cost of civilized measures is saved, the safety factor of operators is high, the aluminum formwork adopts a quick dismantling system, the construction period is saved, the rigidity of the aluminum formwork is large, the concrete forming quality is good, the turnover times are large, and the recycling value is high.
