Nonprobabilistic time-dependent reliability analysis for uncertain structures under interval process loads

IF 3 3区 工程技术 Q2 ENGINEERING, MECHANICAL Probabilistic Engineering Mechanics Pub Date : 2024-10-01 DOI:10.1016/j.probengmech.2024.103687
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Abstract

In this paper, a novel nonprobabilistic analysis framework is proposed to evaluate the time-dependent reliability of uncertain structures under time-varying loads. Firstly, a novel uncertainty propagation method is developed by combining interval process integration and surrogate-based interval analysis and the correlation coefficient between responses of adjacent time steps is further analyzed. Subsequently, the nonprobabilistic time-dependent reliability is analyzed base on the first-passage theory and the established interval model. Unlike existing nonprobabilistic methods that consider time-invariant external loads, the proposed method applies an interval process to describe time-varying external loads, thereby offering a broader range of applicability. Compared to existing nonprobabilistic methods that consider time-varying loads, the proposed method establishes a more refined nonprobabilistic time-dependent reliability model based on the first passage theory, achieving higher accuracy. The effectiveness and superiority of the proposed method are validated through a numerical example and an engineering application.
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区间过程载荷下不确定结构的非概率时间相关可靠性分析
本文提出了一种新的非概率分析框架,用于评估不确定结构在时变载荷作用下的时变可靠性。首先,结合区间过程积分法和基于代用的区间分析法,开发了一种新的不确定性传播方法,并进一步分析了相邻时间步的响应之间的相关系数。随后,基于第一通道理论和已建立的区间模型,分析了非概率随时间变化的可靠性。与现有的考虑时间不变外部载荷的非概率方法不同,所提出的方法采用区间过程来描述时间变化的外部载荷,因此具有更广泛的适用性。与现有的考虑时变载荷的非概率方法相比,所提出的方法以第一通道理论为基础,建立了更精细的非概率时变可靠性模型,实现了更高的精度。通过一个数值实例和一个工程应用验证了所提方法的有效性和优越性。
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来源期刊
Probabilistic Engineering Mechanics
Probabilistic Engineering Mechanics 工程技术-工程:机械
CiteScore
3.80
自引率
15.40%
发文量
98
审稿时长
13.5 months
期刊介绍: This journal provides a forum for scholarly work dealing primarily with probabilistic and statistical approaches to contemporary solid/structural and fluid mechanics problems encountered in diverse technical disciplines such as aerospace, civil, marine, mechanical, and nuclear engineering. The journal aims to maintain a healthy balance between general solution techniques and problem-specific results, encouraging a fruitful exchange of ideas among disparate engineering specialities.
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