Effect of Ground Motion Duration and Different Duration Indexes on the Seismic Response of Structures
In this paper,70 natural seismic waves with different durations are selected,and the seismic records after spectral matching are divided into long and short-duration seismic record sets with 5％～75％significant duration,IDA analysis and elasto-plastic time-his-tory analysis are carried out for the 10-story RC frame structure to study the effects of seismic duration on the seismic response of the structure.Further,selected 35 natural seismic waves,different seismic record sets were constructed by intercepting the corresponding acceleration time segments with different strong motion duration indexes such as bracketed duration,5％～75％and 5％～95％significant duration.The effects of different duration indexes on peak response and hysteretic energy dissipation of RC frame structures were ana-lyzed.The results show that under the same ground motion intensity,the long duration ground motion will lead to greater inter story de-formation and collapse probability of the structure,and the total hysteretic energy dissipation of the structure will increase significantly with the increase of the duration;Under the rare earthquake level,the bracketed duration and 5％～95％significant duration indexes can be selected for the analysis of structural inter story deformation and the peak displacement of the floors,while under the extremely rare earthquake level,the bracketed duration has higher reliability.For the peak velocity of the floor,the mean and variation coefficient of the calculation results of different earthquake sets did not show significant difference;In addition,under the same ground motion intens-ity,it is recommended to choose the bracketed duration for structural hysteretic energy dissipation analysis.
Duration of ground motionGround motion duration indexElastoplastic time history analysisSeismic response of structure
万方数据
维普
