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Development of the Probabilistic Evaluation System of Seismic Damage States for Bridge Structures

桥梁结构地震损伤状态概率评价系统的研制

基本信息

批准号：
12555127
负责人：
MIYAMOTO Ayaho
金额：
$ 3.71万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555127/
关键词：
Bridge structure Seismic damage state Evaluation system Damage transition probability matrix Functional damage Social damage Fault tree analysis Graphical user interface

项目摘要

The Great Hanshin Earthquake had affected seriously on many highway bridges in Hanshin area. From a lot of investigations about the failure mechanisms on the highway bridges during strong earthquake, it was found that the consideration as a highway bridge system which consists of many structural elements such as piles, footings, piers, bearings, restrainers, super structures, etc. is very important to improve of the practical design procedure.This study attempted to develop a newly developed probabilistic evaluation system of seismic damage states for bridge structures. At first, non-linear dynamic response analyses for the reinforced concrete bridge pier system were performed and the response values were calculated. And also, the probability of the first excursion for the threshold that corresponds to multiple damage states was calculated for each response value by the application of threshold-crossing in random vibration theory. Next, the damage transition probability matrix was constructed on the basis of probability of the first excursion. Then, the damage transition probability matrix conducted the damage transition model that included the damage interaction between elements. Finally, based on resulting probabilities of multiple damage states of structure elements, both functional and social damage states of the bridge structures damaged by earthquakes were evaluated. In addition, the development of a program for visualizing damage transition over time with graphical user interface made it possible to check the transition of structural damage easily in the behavior of the entire bridge structure during an earthquake. Then, by comparing cases with and without seismic retrofits, the effects of different seismic retrofit measures on seismic performance were evaluated.

阪神大地震对阪神地区的多座公路桥造成了严重影响。通过对公路桥梁在强震作用下的破坏机理的大量研究发现，将公路桥梁作为一个由桩基、基础、桥墩、支座、约束、上部结构等诸多结构单元组成的体系来考虑，对改进实际设计程序具有重要意义。本文试图建立一种新的桥梁结构震害状态概率评估体系。首先对钢筋混凝土桥墩体系进行了非线性动力响应分析，并计算了响应值。应用随机振动理论中的阈值交叉法，计算了每个响应值对应多个损伤状态的阈值第一次偏移的概率。其次，在第一次偏移概率的基础上构造损伤转移概率矩阵；在此基础上，利用损伤转移概率矩阵建立了包含单元间损伤相互作用的损伤转移模型。最后，根据得到的结构单元多重损伤状态概率，对地震作用下桥梁结构的功能和社会损伤状态进行了评估。此外，开发了一个程序，通过图形用户界面可视化随时间的损伤过渡，从而可以在地震期间轻松检查整个桥梁结构的结构损伤过渡。然后，通过对有和没有进行抗震改造的案例进行比较，评价不同的抗震改造措施对抗震性能的影响。