Estimation of Lateral Drifts of RC Wall Structural System by Monitored Coupling Beams

IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL
Yu-Jiang Zhou, Xiao-Ting Wang, Jie Chen, Dan Xu, Yao Cui, Tao Wang
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引用次数: 0

Abstract

This study aims to enhance understanding of seismic damage patterns of RC wall structural system (RCW) by monitoring the mechanical behavior of coupling beams. The coupling beam, configured with elastic steel truss and friction dampers, is able to consume massive energy during earthquakes, and continuously get the complete histories of sustained forces and deformations by measuring strains of truss diagonal web members and the sliding of friction dampers, respectively. The histories of sliding and force are useful to comprehensively understand the status of dampers and the lateral deformation of coupled wall systems, which further determine the seismic damage state of the overall structure and whether the dampers shall be replaced after an earthquake. In this paper, a series of quasi-static tests were first performed on the proposed coupling beams. The results from the tests indicated that the force contribution of truss chord members gradually increased in a nonlinear pattern with respect to the deformation of coupling beam. This was attributed to the axial force sustained by the coupling beam. Then a theoretical model was proposed to build up the relationship between the strain of diagonal web members and the sustained shear force. The coefficient was given by the equation derived from the simplified model, which provides a prediction with the largest error of 10%. Subsequently, the measured sliding displacements of friction dampers were correlated to the lateral deformation of RC walls considering the bending, shearing, and axial compression of coupled walls. This relationship was examined by a quasi-static test on a three-story coupled wall substructure, and acceptable prediction results can be obtained. These correlations make it possible to assess the damage state of the overall building. The findings of this study not only contribute to the development of a more accurate theoretical model for coupling beams but also offer a practical monitoring technique.

监测耦合梁法估算RC墙结构体系侧移
本研究旨在通过监测耦合梁的力学行为,提高对RC墙结构体系地震损伤模式的认识。组合梁配置弹性钢桁架和摩擦阻尼器,在地震作用下消耗大量能量,通过测量桁架斜腹板的应变和摩擦阻尼器的滑动,连续得到完整的持续力和变形历史。滑移史和受力史有助于全面了解减震器的状态和耦合墙体体系的侧向变形,进而确定整体结构的震害状态以及地震后是否需要更换减震器。本文首先对所提出的耦合梁进行了一系列准静力试验。试验结果表明,桁架弦杆的力贡献随连接梁的变形呈非线性逐渐增大。这是由耦合梁承受的轴向力造成的。在此基础上,建立了斜腹板应变与持续剪力关系的理论模型。该系数由简化模型推导出的方程给出,给出了最大误差为10%的预测结果。随后,考虑耦合墙体的弯曲、剪切和轴压,摩擦阻尼器的实测滑动位移与RC墙体的侧向变形相关。通过对三层连墙子结构的准静力试验验证了这种关系,得到了较好的预测结果。这些相关性使得评估整个建筑的损坏状态成为可能。本研究结果不仅有助于建立更精确的耦合梁理论模型,而且提供了一种实用的监测技术。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Earthquake Engineering & Structural Dynamics
Earthquake Engineering & Structural Dynamics 工程技术-工程:地质
CiteScore
7.20
自引率
13.30%
发文量
180
审稿时长
4.8 months
期刊介绍: Earthquake Engineering and Structural Dynamics provides a forum for the publication of papers on several aspects of engineering related to earthquakes. The problems in this field, and their solutions, are international in character and require knowledge of several traditional disciplines; the Journal will reflect this. Papers that may be relevant but do not emphasize earthquake engineering and related structural dynamics are not suitable for the Journal. Relevant topics include the following: ground motions for analysis and design geotechnical earthquake engineering probabilistic and deterministic methods of dynamic analysis experimental behaviour of structures seismic protective systems system identification risk assessment seismic code requirements methods for earthquake-resistant design and retrofit of structures.
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