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Softening effects of RC nonstructural flat walls on ductile concrete buildings

Authors
Sanada, YasushiYoon, RokhyunAkahori, TakumiOjio, YutoChoi, HoKim, Yousok
Issue Date
Aug-2017
Publisher
WILEY
Keywords
isoparametric element model; moment-resisting frame; numerical analysis; reinforced concrete; seismic performance evaluation; static cyclic loading test
Citation
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS, v.46, no.10, pp.1645 - 1665
Journal Title
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
Volume
46
Number
10
Start Page
1645
End Page
1665
URI
https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/5444
DOI
10.1002/eqe.2874
ISSN
0098-8847
Abstract
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.
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