Wind loading is one of the most important loads for controlling the design of large-span roof structures. Equivalent static wind loads, which can generally aim at determining a specific response, are widely used by st...Wind loading is one of the most important loads for controlling the design of large-span roof structures. Equivalent static wind loads, which can generally aim at determining a specific response, are widely used by structural designers. A method for equivalent static wind loads applicable to multi-responses is proposed in this paper. A modified load- response-correlation （LRC） method corresponding to a particular peak response is presented, and the similarity algorithm implemented for the group response is described. The main idea of the algorithm is that two responses can be put into one group if the value of one response is close to that of the other response, when the structure is subjected to equivalent static wind loads aiming at the other response. Based on the modified LRC, the grouping response method is put forward to construct equivalent static wind loading. This technique can simultaneously reproduce peak responses for some grouped responses. To verify its computational accuracy, the method is applied to an actual large-span roof structure. Calculation results show that when the similarity of responses in the same group is high, equivalent static wind loads with high accuracy and reasonable magnitude of equivalent static wind distribution can be achieved.展开更多
According to the relationship between load and response, the equivalent static wind load(ESWL) of a structure can be estimated by load-response correlation(LRC) method, which can be accurately used to estimate the bac...According to the relationship between load and response, the equivalent static wind load(ESWL) of a structure can be estimated by load-response correlation(LRC) method, which can be accurately used to estimate the background ESWL of a structure. The derivation of the classical expression of LRC formula is based on a specific command response at a critical position, and the ESWL distribution has only one form in this case. In this paper, a general expression of LRC formula is derived based on a specific command response at all positions. For the general expression, ESWLs can be expressed by load-response correlation coefficients, response-response correlation coefficients, RMS values of the fluctuating wind loads, and peak factor in the form of matrices. By comparing the expressions of LRC method, it was found that the classical expression was only one form of the general one. The general expression which introduces the response-response correlation coefficients provided more options for structural engineers to estimate ESWLs and offered further insights into the LRC method. Finally, a cable-stayed bridge, a rigid three span continuous girder bridge, and a suspension bridge were used to verify the correctness of the general expression of LRC method.展开更多
In this paper,the along-wind and cross-wind fluctuating load distributions along the height of high-rise buildings and their correlations are obtained through simultaneous pressure measurements in a wind tunnel.Some t...In this paper,the along-wind and cross-wind fluctuating load distributions along the height of high-rise buildings and their correlations are obtained through simultaneous pressure measurements in a wind tunnel.Some typical methods proposed in some relative litera-tures,i.e.,load-response correlation(LRC),and quasi-mean load(QML)and gust load envelope(GLE)methods,are verified in terms of their accuracy in describing the background equivalent static wind load distribution on high-rise buildings.Based on the results,formulae of the distribution of background equivalent static load on high-rise buildings with typical shapes are put forward.It is shown that these formulae are of high accuracy and practical use.展开更多
This paper introduces some aspects of wind-resistant studies of our research team on tall buildings and structures.Wind tunnel tests were carried out on 27 typical tall building models by using wind pressure scanning ...This paper introduces some aspects of wind-resistant studies of our research team on tall buildings and structures.Wind tunnel tests were carried out on 27 typical tall building models by using wind pressure scanning and HFFB techniques.The characteristics of wind pressures and forces acting on these buildings were analyzed.Some results have been adopted in a Shanghai code for structural design of steel tall buildings.Interference effects on wind forces and wind pressures among two and three tall buildings were experimentally investigated with about 10000 testing conditions.Regression analyses of the interference factors under different parameter conditions were made and the main regression formulas are presented.Theoretical study on equivalent static wind loads of tall buildings and structures are then introduced.Especially,a new concept of"mode coupling factor"and a modified SRSS method for wind response and equivalent static wind load of complicated tall buildings and structures with consideration of multi mode contributions and their coupling effects are presented.Finally,practical applications of wind-resistant studies on tall building and structures,taking the Guangzhou New TV Tower as an example,are presented.展开更多
In this paper,an analytical framework to evaluate the along-wind-induced dynamic responses of a transmission tower is presented.Two analytical models and a new method are developed:(1)a higher mode generalized force s...In this paper,an analytical framework to evaluate the along-wind-induced dynamic responses of a transmission tower is presented.Two analytical models and a new method are developed:(1)a higher mode generalized force spectrum(GFS)model of the transmission tower is deduced;(2)an analytical model that includes the contributions of the higher modes is further derived as a rational algebraic formula to estimate the structural displacement response;and(3)a new approach,applying load with displacement(ALD)instead of force,to solve the internal force of transmission tower is given.Unlike conventional methods,the ALD method can avoid calculating equivalent static wind loads(ESWLs).Finally,a transmission tower structure is used as a numerical example to verify the feasibility and accuracy of the ALD method.展开更多
基金Ministry of Science and Technology of China Under Grant No.SLDRCE10-B-04the National Natural Science Foundation Under Grant No.50621062
文摘Wind loading is one of the most important loads for controlling the design of large-span roof structures. Equivalent static wind loads, which can generally aim at determining a specific response, are widely used by structural designers. A method for equivalent static wind loads applicable to multi-responses is proposed in this paper. A modified load- response-correlation （LRC） method corresponding to a particular peak response is presented, and the similarity algorithm implemented for the group response is described. The main idea of the algorithm is that two responses can be put into one group if the value of one response is close to that of the other response, when the structure is subjected to equivalent static wind loads aiming at the other response. Based on the modified LRC, the grouping response method is put forward to construct equivalent static wind loading. This technique can simultaneously reproduce peak responses for some grouped responses. To verify its computational accuracy, the method is applied to an actual large-span roof structure. Calculation results show that when the similarity of responses in the same group is high, equivalent static wind loads with high accuracy and reasonable magnitude of equivalent static wind distribution can be achieved.
基金Sponsored by the National Natural Science Foundation of China(Grant No.51508107)the China Postdoctoral Science Foundation(Grant No.2016M590592)the Natural Science Foundation of Fujian Province(Grant No.2015J05098)。
文摘According to the relationship between load and response, the equivalent static wind load(ESWL) of a structure can be estimated by load-response correlation(LRC) method, which can be accurately used to estimate the background ESWL of a structure. The derivation of the classical expression of LRC formula is based on a specific command response at a critical position, and the ESWL distribution has only one form in this case. In this paper, a general expression of LRC formula is derived based on a specific command response at all positions. For the general expression, ESWLs can be expressed by load-response correlation coefficients, response-response correlation coefficients, RMS values of the fluctuating wind loads, and peak factor in the form of matrices. By comparing the expressions of LRC method, it was found that the classical expression was only one form of the general one. The general expression which introduces the response-response correlation coefficients provided more options for structural engineers to estimate ESWLs and offered further insights into the LRC method. Finally, a cable-stayed bridge, a rigid three span continuous girder bridge, and a suspension bridge were used to verify the correctness of the general expression of LRC method.
文摘In this paper,the along-wind and cross-wind fluctuating load distributions along the height of high-rise buildings and their correlations are obtained through simultaneous pressure measurements in a wind tunnel.Some typical methods proposed in some relative litera-tures,i.e.,load-response correlation(LRC),and quasi-mean load(QML)and gust load envelope(GLE)methods,are verified in terms of their accuracy in describing the background equivalent static wind load distribution on high-rise buildings.Based on the results,formulae of the distribution of background equivalent static load on high-rise buildings with typical shapes are put forward.It is shown that these formulae are of high accuracy and practical use.
基金supported by the National Natural Science Foundation of China(Grant No.90715040)
文摘This paper introduces some aspects of wind-resistant studies of our research team on tall buildings and structures.Wind tunnel tests were carried out on 27 typical tall building models by using wind pressure scanning and HFFB techniques.The characteristics of wind pressures and forces acting on these buildings were analyzed.Some results have been adopted in a Shanghai code for structural design of steel tall buildings.Interference effects on wind forces and wind pressures among two and three tall buildings were experimentally investigated with about 10000 testing conditions.Regression analyses of the interference factors under different parameter conditions were made and the main regression formulas are presented.Theoretical study on equivalent static wind loads of tall buildings and structures are then introduced.Especially,a new concept of"mode coupling factor"and a modified SRSS method for wind response and equivalent static wind load of complicated tall buildings and structures with consideration of multi mode contributions and their coupling effects are presented.Finally,practical applications of wind-resistant studies on tall building and structures,taking the Guangzhou New TV Tower as an example,are presented.
基金National Natural Science Foundation of China Under Grant No.50638010Foundation of Ministry of Education for Innovation Group Under Grant No.IRT0518
文摘In this paper,an analytical framework to evaluate the along-wind-induced dynamic responses of a transmission tower is presented.Two analytical models and a new method are developed:(1)a higher mode generalized force spectrum(GFS)model of the transmission tower is deduced;(2)an analytical model that includes the contributions of the higher modes is further derived as a rational algebraic formula to estimate the structural displacement response;and(3)a new approach,applying load with displacement(ALD)instead of force,to solve the internal force of transmission tower is given.Unlike conventional methods,the ALD method can avoid calculating equivalent static wind loads(ESWLs).Finally,a transmission tower structure is used as a numerical example to verify the feasibility and accuracy of the ALD method.
