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Softening effects of RC nonstructural flat walls on ductile concrete buildings

机译：钢筋混凝土非结构墙对延性混凝土建筑物的软化效果

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Nonstructural reinforced concrete flat walls architecturally designed as exterior/partition walls in concrete buildings were severely damaged by the 2011 earthquake off the Pacific coast of Tohoku. This damage was observed in the monolithic nonstructural flat walls of relatively old ductile concrete buildings. Although these flat walls might affect the overall seismic performance and behavior of a building, the nonstructural wall effects have not been clarified because of the complex interactions among the structural components. To understand these effects, this paper conducts an experimental and numerical investigation of the nonstructural wall effects, focusing on a typical residential building damaged by the 2011 earthquake. A single-story, one-bay moment-resisting frame model of the building with a nonstructural flat wall was tested to clarify the fundamental behavior. The results reveal that the wall significantly contributed to the seismic performance of the overall frame until it failed in shear, subsequently losing structural effectiveness. Such experimental wall behavior could be simulated by the isoparametric element model. Moreover, the structural effects of the nonstructural flat walls on the global seismic performance and behavior of the investigated building were discussed through earthquake response analyses using ground motions recorded near the building site and pushover analyses. Consequently, the building damage could be simulated in an analytical case considering the nonstructural flat walls, showing larger inter-story drifts in the lower stories due to softening of the walls. The analytical results also indicated that the softening of the nonstructural flat walls decreased the building ductility, as defined by ultimate inter-story drifts. Copyright (C) 2017 John Wiley & Sons, Ltd.
机译：非结构性钢筋混凝土平墙在建筑上被设计成混凝土建筑物的外墙/隔墙，在2011年东北太平洋沿岸地震中受到严重破坏。在相对较旧的可延展混凝土建筑物的整体式非结构性平坦墙中观察到了这种损坏。尽管这些平坦的墙可能会影响建筑物的整体抗震性能和性能，但由于结构组件之间的复杂相互作用，因此尚未弄清非结构墙的影响。为了理解这些影响，本文对非结构墙效应进行了实验和数值研究，重点是受2011年地震破坏的典型住宅建筑。对具有非结构性平坦墙的建筑物的单层，单舱抗弯框架模型进行了测试，以阐明基本行为。结果表明，在剪力作用破裂之前，墙对整个框架的抗震性能起了重要作用，随后丧失了结构有效性。这样的实验墙行为可以通过等参单元模型来模拟。此外，通过地震响应分析，使用记录在建筑工地附近的地震动和推覆分析，讨论了非结构平壁对被调查建筑物的整体地震性能和行为的结构影响。因此，可以在考虑非结构性平坦墙的分析情况下模拟建筑物损坏，显示由于墙体的软化，较低楼层的层间位移较大。分析结果还表明，非结构性平坦墙体的软化降低了建筑物的延展性，这是由最终的层间位移确定的。版权所有（C）2017 John Wiley＆Sons，Ltd.

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