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Survey on the Fatigue Damages of Highway Bridges in Metropolitan Districts and Study on their Protective Measures

都市区公路桥梁疲劳损伤调查及防护措施研究

基本信息

批准号：
62302041
负责人：
NAKAI Hiroshi
金额：
$ 3.52万
依托单位：
Osaka City University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62302041/
关键词：
Fatigue Steel bridges Highway bridges Damages survey Structural details 都市高速道路局部応力解析

项目摘要

A series of survey on actual cases of fatigue damages in highway bridges and research of how to protect then from fatigue damages was executed in this study during the last three years, from 1987 until 1989, because these problems have become one of the most important ones for the maintenance of the current expressways in metropolitan districts.In the first year 1987, a number of available reports and literatures on the actual fatigue damages of highway bridges were collected and these examples were categorized and arranged according to their structural details. At the same time, discussion was made on the analytical method to be adopted in order to clarify the causes of these fatigue damages.In the following years, 1988, an analytical method, based on finite strip method and finite element method, to evaluate the stress concentration in the structural details of highway bridges was developed and it was proved that this method was effective for evaluating the actual stress concentratio … More n at the structural details. In addition, a method to simulate the stress induced by the actual traffic flow upon the highway bridges was developed based on statistical approach. Furthermore, as a case study, a method for protecting the sole plate near the bearing shoes of highway bridges against fatigue damage, which has been often and frequently observed and whose cases should rapidly be found from the standpoint of fatigue, was researched.In the final year 1989, the remaining problem, i.e., the study on the protection of the fatigue damages in highway bridges was carried out. For this purposes, the standard for the structural details by some Japanese Highway Administrations were collected and the most desirable types in terms of fatigue were discussed. Moreover, a survey through questionare on the best structural detail of highway bridges to protect against the fatigue damages was performed among steel bridge designers and fabricators, and these results were summarized in a report so as to serve as a valuable reference for future studies. Less

由于疲劳损伤问题已成为当前大都市区高速公路养护中的重要问题之一，本研究在1987~1989年间对公路桥梁疲劳损伤的实际案例进行了一系列调查，并对如何防止疲劳损伤进行了研究。1987年第一年，收集了大量现有的关于公路桥梁实际疲劳损伤的报告和文献，并按结构细节进行了分类和整理。1988年，提出了一种基于有限条法和有限单元法相结合的分析方法，对公路桥梁结构细节处的应力集中进行了评估，证明了该方法对…实际应力集中的评估是有效的在结构细节上有更多的n。此外，还提出了一种基于统计方法的模拟实际车流对公路桥梁产生的应力的方法。并以此为例，研究了公路桥梁承重鞋底底板的疲劳损伤防护方法，这是一种经常被观察到并应从疲劳的角度迅速发现的情况。1989年底，开展了剩余问题--公路桥梁疲劳损伤防护的研究。为此，收集了日本一些公路管理部门的结构细节标准，并就疲劳方面的最理想类型进行了讨论。此外，还在钢桥设计者和施工者中对防止疲劳损伤的公路桥的最佳结构细节进行了调查，并将这些结果总结在报告中，以供今后的研究参考。较少