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《Journal of Vibration and Shock》 2018-12
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Comparative analysis of action mechanisms for high-rise structures under near-fault and far-field long-period ground motions

WANG Bo;DAI Huijuan;WU Tao;LIU Boquan;School of Civil Engineering,Chang'an University;School of Architecture and Civil Engineering,Xi'an University of Science and Technology;  
Three types of long-period ground motions including far-field harmonic-like ground motions,near-fault forward-directivity ground motions,and near-fault fling-step ground motions were selected as objects. Firstly,based on the analysis of correlation between the maximum instantaneous input energy of long-period ground motion and the maximum displacement response of a SDOF system,the concept of instantaneous input energy ratio was proposed,and the structural failure modes under different types of long-period ground motions were discussed. Then,one 12-layer RC frame structure was taken for example,and the controlled IMF components of long-period ground motions for the elastic-plastic seismic response were analyzed based on Hilbert-Huang Transform( HHT). Besides,the instantaneous energy curves and accumulative energy curves for different types of long-period ground motions were investigated. And on this basis,the concepts of valid longperiod ground motion,valid peak and energy gradient were proposed,and the action mechanisms of long-period ground motions on high-rise structures were studied from the perspectives of frequency and time domains,respectively. The results show that the valid peaks of long-period ground motions are larger than those of ordinary ground motions,and it reveals the internal mechanism which causes the seismic responses of high-rise structures under long-period ground motions are larger than those under ordinary ground motions; the analysis of energy gradients shows that the energy release characteristics of different types of long-period ground motions are obviously different,and it reveals the action mechanisms of long-period ground motions. For the far-field harmonic-like ground motion,it has the pulse cyclic action mechanism which is easy to cause the cumulative damage failure; for the near-fault forward-directivity ground motion and near-fault fling-step ground motion,they have the pulse impact action mechanism which is easy to cause the first exceed failure.
【Fund】: 国家自然科学基金项目(51708037;51408483);; 中国博士后科学基金面上资助项目(2017M610616);; 陕西省博士后科研资助项目(2017BSHEDZZ111);; 中央高校基本科研业务费专项资金资助项目(300102288111)
【CateGory Index】: TU973.31
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