考虑寿命期内材料劣变与损伤积累的桥梁抗震可靠度分析

项目名称： 考虑寿命期内材料劣变与损伤积累的桥梁抗震可靠度分析

项目编号： No.51278376

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 袁万城

作者单位： 同济大学

项目金额： 81万元

中文摘要： 目前我国多数桥梁因材料劣变而存在结构能力退化等问题，且主震-余震序列波会使桥梁损伤积累而更容易破坏。对于材料劣变与损伤积累的桥梁，目前的研究成果和规范尚不能给出合理的地震分析与安全评估方法。而对桥梁抗震可靠度的研究仅局限在构件层次，对体系可靠度的研究不足，有关体系失效模式探索的方法一直存在搜索效率低、结论不够准确等问题。为此，本课题针对典型的公路桥梁，通过在结构的能力与需求模型中体现材料劣变与损伤积累的影响，进而进行桥梁结构抗震可靠度分析。主要内容包括：（1）建立材料劣变与损伤积累影响的能力与需求模型；（2）采用有条件模拟地震波输入，进行逐级增量加载振动台组试验，验证有限元模型与理论分析方法的有效性；（3）通过易损性分析方法得到体系失效模式，采用ANN-MC方法进行可靠度分析；（4）构建桥梁结构抗震可靠度分析方法。研究成果可为桥梁的全寿命设计、既有桥梁的运营以及地震风险评估等提供理论。

中文关键词： 抗震可靠度；材料劣变；损伤积累；体系易损性；振动台试验

英文摘要： Nowadays, structural capacities of many bridges in China degrade due to material deterioration and other reasons. It increases the possibility of fracture or even collapse of these bridges under action of earthquake, especially a sequence of main-shock and after-shock excitations, which always lead to an accumulation of damage in structure. However, our current literatures and design codes have not supplied a reliable method to carry out seismic analysis and assessment of the bridge considering the damage accumulation and the material deterioration. Earlier researches on seismic reliability for bridges mainly focus on the reliability of components but little on that of a total system due to low efficiency and less accuracy in searching for the failure modes of a whole bridge. Therefore, this project focuses on developing a seismic reliability methods and propose a reliability assessment procedure for typical highway bridge systems considering structural material deterioration and damage accumulation. The works mainly include: 1) developing a structural capacity and demand model considering damage accumulation and material deterioration; 2) carrying out multi-excitation shake table experiments to validate the finite element methods and analytical methods using incremental inputs of conditional real groundmotions;

英文关键词： Seismic Reliability；Material Deterioration；Accumulated Damage；Fragility Analysis；Shaking table test