基于极值分布理论和Copula技术的桥梁系统地震可靠性分析方法研究
结题报告
批准号:
52008047
项目类别:
青年科学基金项目
资助金额:
24.0 万元
负责人:
张金
依托单位:
学科分类:
结构工程
结题年份:
2023
批准年份:
2020
项目状态:
已结题
项目参与者:
张金
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中文摘要
由于材料老化及静动力作用导致的结构性能退化,我国铁路公路交通网中的部分桥梁难以满足结构抗震的要求。考虑地震动以及桥梁结构的双重不确定性,常采用基于概率的可靠度分析方法对桥梁的抗震性能进行评估。如何高效准确评估构件在非平稳地震动下的极值响应分布以及微小失效概率,明确构件地震需求之间的相关特性成为桥梁系统地震可靠性分析的关键内容。本项目拟引入谱表示-随机函数方法对完全非平稳地震动做降维模拟,提出改进的伪相关性折减拉丁超立方抽样方法确定结构-地震动分析样本,对结构非线性极值响应分数矩进行估计,再结合平移广义对数正态分布模型建立结构构件极值响应分布及微小失效概率评估方法;最后基于Copula函数研究构件地震需求相关性的尾部特征及时变特性,从而建立和完善针对复杂桥梁系统的地震可靠性分析方法,揭示在役桥梁地震可靠性的概率演化规律。研究成果可为桥梁的全寿命周期抗震设计及区域地震风险评估提供科学依据。
英文摘要
Due to the deterioration of the structural performance caused by the aging of materials and the combined effect of static and dynamic forces, some bridges in Chinese railway and highway transportation networks are difficult to meet the seismic requirements of the structures. Considering the double uncertainty of ground motions and bridge structure, the probability-based reliability analysis method is often used to evaluate the seismic performance of the bridge. How to efficiently and accurately evaluate the extreme response distribution and small failure probability of structural members under non-stationary ground motions, as well as to clarify the relevant characteristics between the seismic requirements of the members become the key content to the seismic reliability analysis of bridge systems. This project intends to introduce a spectral representation-random function method to perform dimensionality reduction simulation on completely non-stationary ground motion, and propose an improved pseudo-correlation reduction Latin hypercube sampling method to determine the structure-ground motion analysis samples and the fractional moments of the structural nonlinear seismic response are estimated, and then combined with the shift generalized lognormal distribution model to establish extreme response distribution and the tiny failure probability evaluation method of the structural members; Finally, based on the Copula function, the tail characteristics and time-varying characteristics of component seismic demand correlation are studied, so as to establish and improve the seismic reliability analysis method for complex bridge systems, and reveal the probability evolution law of seismic reliability of in-service bridges. The research results can provide a scientific basis for the life-cycle seismic design of the bridge and regional earthquake risk assessment.
期刊论文列表
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科研奖励列表
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专利列表
DOI:10.3969/j.issn.1001-8360.2023.02.017
发表时间:2023
期刊:铁道学报
影响因子:--
作者:张金;陈克坚;曾永平;郭恒;郑史雄;范晨阳
通讯作者:范晨阳
DOI:10.1016/j.istruc.2021.07.039
发表时间:2021-10
期刊:Structures
影响因子:4.1
作者:Zhi-Qiang Chen;Shixiong Zheng;Jin Zhang;Hong-yu Jia
通讯作者:Zhi-Qiang Chen;Shixiong Zheng;Jin Zhang;Hong-yu Jia
DOI:10.3390/buildings13102492
发表时间:2023-09
期刊:Buildings
影响因子:3.8
作者:Jin Zhang;Yunpeng Hu;Xiang Liu;Meng-yao Peng
通讯作者:Jin Zhang;Yunpeng Hu;Xiang Liu;Meng-yao Peng
DOI:--
发表时间:2021
期刊:工程力学
影响因子:--
作者:宋帅;吴元昊;徐佰顺;吴刚;张金
通讯作者:张金
DOI:10.1016/j.engstruct.2021.113157
发表时间:2021-11
期刊:Engineering Structures
影响因子:5.5
作者:Zhi-Qiang Chen;Shixiong Zheng;Zihan Ding;Jin Zhang;Yu-ji Tai
通讯作者:Zhi-Qiang Chen;Shixiong Zheng;Zihan Ding;Jin Zhang;Yu-ji Tai
国内基金
海外基金