Precise analysis of the floor acceleration amplification(FAA)factor is crucial for accurately predicting the acceleration on acceleration-sensitive nonstructural components and estimating the seismic safety of nonstru...Precise analysis of the floor acceleration amplification(FAA)factor is crucial for accurately predicting the acceleration on acceleration-sensitive nonstructural components and estimating the seismic safety of nonstructural components.However,the existing literature on FAA did not analyze various influencing factors quantitatively.For solving this problem,one novel quantitative analyzing method of FAA considering various influencing factors in terms of structural type,structural height,site category,structural period,relative height and ground motion intensity based on instrumented buildings data from the Center for Engineering Strong Motion Data(CESMD)is proposed.The analysis results revealed that the site categories can significantly affect the FAA values of various types of structures,however,which has not been emphasized in previous studies.Correlation analysis reveals that the relative height is strongly correlated with the FAA,which is consistent with several seismic design codes.While,the parameters in terms of the site category,structural height and structural type also significantly correlated with the FAA.The results indicate that these three factors should be incorporated into the seismic design code.This study offers valuable insights and recommendations for the design of acceleration-sensitive nonstructural components in terms of FAA.展开更多
The seismic design forces of nonstructural components(NSCs)in buildings are closely related to floor acceleration response amplification.To investigate the differences in acceleration responses of structures with diff...The seismic design forces of nonstructural components(NSCs)in buildings are closely related to floor acceleration response amplification.To investigate the differences in acceleration responses of structures with different structural types,fundamental periods,and seismic design levels,56 reinforced concrete and steel structures with fundamental periods ranging from 0.37 s to 5.68 s were selected.For each structure,100 sets of earthquake motions were used as inputs for elastic time history analysis.Based on the resulting 26,500 sets of floor acceleration response data,the amplification rules of peak floor acceleration/peak ground acceleration(PFA/PGA)along the height of various structures and the corresponding floor response spectrum characteristics were studied.The nonlinear changes of PFA/PGA along the height of long period structures were compared with the codes of different countries.Moreover,more suitable prediction equations were proposed based on the structural characteristics.Finally,to solve the issue that existing research still cannot accurately reflect the acceleration amplification coefficient of NSCs with different dynamic characteristics in main structures with different periods,a normalized floor response spectrum is proposed that can simultaneously consider the effects of input ground motion characteristics and the main structure,which can be better used in the seismic design of NSCs.展开更多
基金National Natural Science Foundation of China under Grant Nos.52278173,52378150 and 52078398Foundation of Key Laboratory of Structures Dynamic Behavior and Control(Ministry of Education)in Harbin Institute of Technology under Grant No.HITCE202008。
文摘Precise analysis of the floor acceleration amplification(FAA)factor is crucial for accurately predicting the acceleration on acceleration-sensitive nonstructural components and estimating the seismic safety of nonstructural components.However,the existing literature on FAA did not analyze various influencing factors quantitatively.For solving this problem,one novel quantitative analyzing method of FAA considering various influencing factors in terms of structural type,structural height,site category,structural period,relative height and ground motion intensity based on instrumented buildings data from the Center for Engineering Strong Motion Data(CESMD)is proposed.The analysis results revealed that the site categories can significantly affect the FAA values of various types of structures,however,which has not been emphasized in previous studies.Correlation analysis reveals that the relative height is strongly correlated with the FAA,which is consistent with several seismic design codes.While,the parameters in terms of the site category,structural height and structural type also significantly correlated with the FAA.The results indicate that these three factors should be incorporated into the seismic design code.This study offers valuable insights and recommendations for the design of acceleration-sensitive nonstructural components in terms of FAA.
基金Natural Science Foundation of China under Grant Nos.52078471,52078472 and 52208509National Key Research and Development Plan of China under Grant No.2019YFE0112700+2 种基金Natural Science Foundation of Heilongjiang Province under Grant No.LH2022E121Special Project for Basic Scientific Research Business Expenses of the Institute of Engineering Mechanics,China Earthquake Administration under Grant No.2022C04Director’s Fund Director’s Fund of Earthquake Agency of Inner Mongolia Autonomous Region under Grant No.2023MS10。
文摘The seismic design forces of nonstructural components(NSCs)in buildings are closely related to floor acceleration response amplification.To investigate the differences in acceleration responses of structures with different structural types,fundamental periods,and seismic design levels,56 reinforced concrete and steel structures with fundamental periods ranging from 0.37 s to 5.68 s were selected.For each structure,100 sets of earthquake motions were used as inputs for elastic time history analysis.Based on the resulting 26,500 sets of floor acceleration response data,the amplification rules of peak floor acceleration/peak ground acceleration(PFA/PGA)along the height of various structures and the corresponding floor response spectrum characteristics were studied.The nonlinear changes of PFA/PGA along the height of long period structures were compared with the codes of different countries.Moreover,more suitable prediction equations were proposed based on the structural characteristics.Finally,to solve the issue that existing research still cannot accurately reflect the acceleration amplification coefficient of NSCs with different dynamic characteristics in main structures with different periods,a normalized floor response spectrum is proposed that can simultaneously consider the effects of input ground motion characteristics and the main structure,which can be better used in the seismic design of NSCs.
