The present study investigates the effect of earthquake sequences on the response of reinforced concrete hilly buildings having typical configurations, that is, stepback and split-foundation, with three different story ratios. A set of 30 as-recorded mainshock-aftershock sequence of earthquake ground motions is considered for this study. Mainshock acceleration time histories are scaled at two distinct intensity levels to obtain the mainshock-damaged building. These mainshock-damaged hilly buildings are then subjected to aftershocks. A comparative study is performed for various response quantities, such as peak interstory drift ratio, peak floor acceleration, and peak roof displacement of undamaged and mainshock-damaged buildings under aftershocks. Further, fragility analysis is carried out to study the effect of aftershocks on undamaged and mainshock-damaged hilly buildings. Subsequently, component-wise seismic loss estimation due to damage in the non-structural and structural components is performed. It is concluded from the study that the building components that contribute maximum to the expected repair cost ratio vary with respect to the intensity of the aftershocks. Also, the estimated seismic loss is higher in mainshock-damaged split-foundation buildings in comparison to stepback buildings.

中文翻译：

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地震序列作用下钢筋混凝土山地建筑抗震性能评价

本研究研究了地震序列对具有典型配置（即退步式基础和分体式基础）以及三种不同层数比例的钢筋混凝土山地建筑响应的影响。本研究考虑了一组已记录的 30 个主震-余震地震地面运动序列。主震加速时程按两个不同的强度级别进行缩放，以获得主震损坏的建筑物。这些在主震中受损的山丘建筑随后又遭受余震。对未受损和主震受损建筑物在余震作用下的峰值层间位移比、峰值楼板加速度、峰值屋顶位移等各种响应量进行了对比研究。此外，还进行了易损性分析，以研究余震对未损坏和主震损坏的山地建筑的影响。随后，对由于非结构和结构部件的损坏而造成的按部件的地震损失进行估计。研究得出的结论是，对预期修复成本比例贡献最大的建筑构件随余震强度的不同而变化。此外，与后退式建筑相比，主震损坏的分体式基础建筑的估计地震损失更高。