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Seismic performance and failure mechanism of mega-braced frame-core tube structure with different brace patterns

Li, Zuohua, Liu, Pengyuan, Teng, Jun and Wang, Ying (2018) Seismic performance and failure mechanism of mega-braced frame-core tube structure with different brace patterns Advances in Civil Engineering.

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Abstract

The effect of mega braces on structural stiffne ss has been comprehensivel y discussed for various mega-braced frame-core tube structures. However, few studies have considered how mega braces affect the failure mechanism of mega-structures exposed to seismic action, which is a nonlinear process. To address this issue, we present a study on the effects of diff erent brace patterns on the failure mechanism and seismic performance of mega-braced frame-core tube structures. Specifically, the yield order of components, the distribution of plasticity, the distribution of internal forces, the degradation of structural nonlinear stiffness, and the behavior factor have been investigated. This study reveals that the yield of mega braces will change the deformation mode of adjacent mega columns, and thus affect the plasticity distribution of adjacent sub-structures. The enhancement of mega braces improves the exterior tubes (thereby increasing their capacity to serve as the second line of seismic defence), mitigates the rate at which system stiffness degrades, and improves the overstrength of the structural systems. In addition, after mega braces yield, the maintenance of a higher-amplitude axial force changes the proportion of internal force components in mega columns, reducing their ductility and further affecting the overall ductility of the structural system.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
NameEmailORCID
Li, Zuohua
Liu, Pengyuan
Teng, Jun
Wang, Yingying.wang@surrey.ac.uk
Date : 2018
Copyright Disclaimer : Copyright 2018 The Author(s). This is an Open Access article, distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided that the original work is properly cited.
Uncontrolled Keywords : Seismic performance, brace patterns, mega-braced fr ame-core tube structure, behavior factors, nonlinear static pushover analys is, incremental dynamic analysis
Depositing User : Melanie Hughes
Date Deposited : 30 Nov 2018 09:24
Last Modified : 30 Nov 2018 09:24
URI: http://epubs.surrey.ac.uk/id/eprint/849956

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