Multiple performance criteria-based risk assessment forstructures equipped with MR dampers

IF 1.4 4区工程技术 Q3 ENGINEERING, CIVIL

Earthquakes and Structures Pub Date : 2021-05-01 DOI:10.12989/EAS.2021.20.5.495

M. Mohebbi, S. Bakhshinezhad

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引用次数: 1

Abstract

In this paper, a procedure to seismic risk assessment of structures equipped with magnetorheological (MR) damper considering multiple performance criteria has been presented while accounting for uncertainties of the applied excitation, structure and damper properties, and damage state thresholds. The procedure employes the Latin hypercube sampling (LHS) method to generate 30 sample random MR-Structure systems and incremental dynamic analysis (IDA) has been conducted under 20 earthquakes to evaluate engineering demand parameters. Fragilities have been evaluated using the Monte Carlo simulation (MCS) method in each intensity measure and have been integrated with the hazard curve to determine the reliability during lifetime. For numerical analysis, an eight-story nonlinear shear building with bilinear hysteresis behavior has been adopted. The effectiveness of the introduced methodology is illustrated through a seismic risk assessment of the structure equipped with passive-off and passive-on MR dampers. Numerical results have shown the capability of MR dampers in significant mitigation of the seismic risk of the nonlinear structure. Moreover, it is observed that considering multiple performance criteria of the structural system, non-structural components, and MR damper stroke length and the interaction between them has led to increase the seismic risk. Also, the uncertainty of the applied excitation shows more remarkable influence with respect to the other sources of uncertainties.

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基于多性能标准的MR阻尼器结构风险评估

本文提出了一种考虑多种性能标准的磁流变阻尼器结构地震风险评估程序，同时考虑了外加激励、结构和阻尼器性能以及损伤状态阈值的不确定性。该程序采用拉丁超立方体抽样（LHS）方法生成了30个样本的随机MR结构系统，并在20次地震下进行了增量动力分析（IDA），以评估工程需求参数。在每个强度测量中，都使用蒙特卡罗模拟（MCS）方法评估了脆弱性，并将其与危险曲线相结合，以确定寿命期间的可靠性。数值分析采用了具有双线性滞回特性的八层非线性剪切建筑。通过对配备被动关闭和被动开启MR阻尼器的结构进行地震风险评估，说明了所引入方法的有效性。数值结果表明，磁流变阻尼器能够显著降低非线性结构的地震风险。此外，还观察到，考虑到结构系统、非结构部件和MR阻尼器行程长度的多种性能标准以及它们之间的相互作用，导致了地震风险的增加。此外，相对于其他不确定性来源，施加激励的不确定性表现出更显著的影响。

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

Earthquakes and Structures ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL

CiteScore

2.90

自引率

20.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Earthquakes and Structures, An International Journal, focuses on the effects of earthquakes on civil engineering structures. The journal will serve as a powerful repository of technical information and will provide a highimpact publication platform for the global community of researchers in the traditional, as well as emerging, subdisciplines of the broader earthquake engineering field. Specifically, some of the major topics covered by the Journal include: .. characterization of strong ground motions, .. quantification of earthquake demand and structural capacity, .. design of earthquake resistant structures and foundations, .. experimental and computational methods, .. seismic regulations and building codes, .. seismic hazard assessment, .. seismic risk mitigation, .. site effects and soil-structure interaction, .. assessment, repair and strengthening of existing structures, including historic structures and monuments, and .. emerging technologies including passive control technologies, structural monitoring systems, and cyberinfrastructure tools for seismic data management, experimental applications, early warning and response