地震动特性对半刚接钢框架内填暗竖缝RC墙结构位移反应影响

Effects of ground motion characteristics on the seismic behavior of partially-restrained steel frame with concealed vertical slits RC infill walls

为研究半刚接钢框架内填暗竖缝RC墙结构(简称PSRCW结构)在近场向前方向性效应速度脉冲、滑冲效应速度脉冲和远场加速度循环效应地震作用下的抗震性能,根据现行建筑抗震规范设计了1榀10层PSRCW结构算例,选择了3组共计75条向前方向性效应、滑冲效应速度脉冲近场地震波和带加速度循环效应远场地震波,采用动力弹塑性时程法对其进行了分析。结果表明,滑冲效应速度脉冲近场地震波对PSRCW结构产生的地震位移响应最大,向前方向性速度脉冲近场地震对PSRCW结构产生的位移响应次之,远场加速度循环效应地震波导致PSRCW结构地震响应最小。多遇地震下,PSRCW结构对应于远场地震波、近场向前方向性速度脉冲近场地震波、滑冲效应速度脉冲近场地震波所产生的最大层间位移角均值分别为0.16%、0.26%、0.32%,均满足现行抗震规范限值1/250的要求。罕遇地震下,PSRCW结构对应上述三类地震波所产生的最大层间位移角均值分别为0.8%、1.98%、3.70%。滑冲效应速度脉冲近场地震波所产生的层间位移角已无法满足现行抗震规范限值1/50的要求,PSRCW结构的合理抗震设计需考虑带速度脉冲的两类近场地震波影响。

In order to investigate the seismic behavior of partially-restrained steel frame with concealed vertical slits RC infill walls(PSRCW)subjected to far-fault earthquake waves,near-fault earthquake waves with fling step velocity pulse,and near-fault earthquake waves with forward directivity effect,a ten-story PSRCW structure is designed according to the current Chinese seismic code.Three groups with a total of 75 earthquake waves are selected,and the seismic behavior of PSRCW is analyzed by the nonlinear time history analysis method.The results show that the near-fault earthquake waves with fling-step effect result in the largest displacement response on the PSRCW structure,the near-fault earthquake waves with forward directivity effect produce the moderate seismic displacement response,and the far-fault earthquake waves lead to the smallest seismic displacement response.Under the small earthquake level,the maximum inter-story drift ratios of PSRCW are 0.16%,0.26%and 0.32%responding to far-fault earthquake waves,near-fault earthquake waves with forward directivity and fling-step velocity pulse,which satisfies the 1/250 inter-story drift ratio requirement of Chinese seismic code.Under the rare earthquake level,the maximum inter-story drift ratios of PSRCW are 0.8%,1.98%and 3.70%corresponding to the above three types of earthquake waves.The 1/50 inter-story drift ratio requirement from Chinese seismic code for near-fault earthquake waves with fling step velocity pulse com not be satisfied.Therefore,the velocity pulse effect of near-fault earthquake waves should be considered reasonably for the seismic design of PSRCW structure.