System reliability analysis of building clusters considering inter-structural seismic demand correlation

IF 5.7 1区 工程技术 Q1 ENGINEERING, CIVIL
Mengjie Xiang , Mengze Lyu , Jiaxu Shen , Zekun Xu , Jun Chen
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引用次数: 0

Abstract

The seismic engineering demand parameters (EDPs) of building clusters exhibit significant spatial correlations and need full consideration in regional risk and reliability assessments. This study presents an efficient scheme to determine the joint distribution of multi-structure EDPs, which captures all EDP correlations and enables direct calculation of system reliability for building clusters. This scheme generates spatially correlated random ground motion fields through ground motion cross power spectrum density (PSD) models with stochastic harmonic function simulations. Subsequently, the decoupled multi-probability density evolution method (M−PDEM) is integrated to conduct seismic analysis of building clusters under random ground motion fields to determine their EDP joint distribution. An example of three linear single-degree-of-freedom (SDOF) models shows that the proposed scheme requires only hundreds of analyses to achieve the same accuracy as 105 Monte Carlo Simulation (MCS) analyses, while also capturing the nonlinear correlations among EDPs. Finally, an engineering application of three reinforced concrete (RC) frame shear-wall buildings under a rare earthquake scenario is investigated, and the joint collapse probability by the scheme is compared with that by commonly-adopted assumptions of mutual independence and linear correlation. The results reveal that relative errors by the two assumptions can reach up to 39 % and 22 %, respectively.

考虑结构间地震需求相关性的建筑群系统可靠性分析
建筑群的地震工程需求参数(EDPs)表现出显著的空间相关性,需要在区域风险和可靠性评估中予以充分考虑。本研究提出了一种确定多结构 EDPs 联合分布的有效方案,该方案能捕捉到所有 EDP 相关性,并能直接计算建筑群的系统可靠性。该方案通过地动交叉功率谱密度 (PSD) 模型与随机谐波函数模拟,生成空间相关的随机地动场。随后,集成了解耦多概率密度演化法(M-PDEM),对随机地面运动场下的建筑群进行地震分析,以确定其 EDP 的联合分布。三个线性单自由度(SDOF)模型的实例表明,拟议方案只需数百次分析即可达到与 105 次蒙特卡罗模拟(MCS)分析相同的精度,同时还能捕捉 EDP 之间的非线性相关性。最后,研究了罕见地震情况下三栋钢筋混凝土(RC)框架剪力墙建筑的工程应用,并将该方案得出的联合倒塌概率与通常采用的相互独立和线性相关假设得出的联合倒塌概率进行了比较。结果表明,两种假设的相对误差可分别达到 39% 和 22%。
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来源期刊
Structural Safety
Structural Safety 工程技术-工程:土木
CiteScore
11.30
自引率
8.60%
发文量
67
审稿时长
53 days
期刊介绍: Structural Safety is an international journal devoted to integrated risk assessment for a wide range of constructed facilities such as buildings, bridges, earth structures, offshore facilities, dams, lifelines and nuclear structural systems. Its purpose is to foster communication about risk and reliability among technical disciplines involved in design and construction, and to enhance the use of risk management in the constructed environment
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