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Study on Fatigue Design Load for Steel Bridge Piers and Steel Girder Bridges

钢桥墩及钢梁桥疲劳设计荷载研究

基本信息

批准号：
17560429
负责人：
NAKAMURA Shozo
金额：
$ 2.2万
依托单位：
Nagasaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17560429/
关键词：
fatigue design live load modification factor steel highway bridges Monte Carlo simulation percentage of heavy vehicles

项目摘要

The latest version of the design code for highway bridges specifies that the fatigue design should be carried out. Details of the design method are described in the fatigue design recommendations. However, the accuracy of the fatigue damage verification is not clear for a variety of traffic flow. In addition, its applicability to steel bridge piers is not clearly defined. In this study, fatigue design load for steel bridge piers and steel girder bridges considering traffic flow characteristics is examined. The studied structures are two-lane steel girder bridges and portal frame steel bridge piers supporting two-lane simply supported or three-span continuous bridges. Fatigue damages by T-load specified in the Japanese Design Code for Highway Bridges and simulated traffic flow at span center in girder bridges and column side of rigid connection in bridge piers are calculated. The Monte Carlo simulation technique is used to produce the traffic flow. In the simulation, some values expressing the properties of traffic flow and structures are changed to evaluate their influence on fatigue damages or love load modification factor. The fatigue damages of steel girder bridges obtained by Monte Carlo simulation are compared with that calculated by the fatigue design recommendations to examine its accuracy. The obtained fatigue damages are also used to evaluate the live load modification factor far girder bridges and bridge piers. Finally, new fatigue design loads for these structures are proposed and their validity is confirmed.

最新版的公路桥梁设计规范明确要求进行疲劳设计。在疲劳设计建议中详细描述了设计方法。然而，对于各种交通流，疲劳损伤验证的准确性尚不明确。此外，其对钢桥墩的适用性也没有明确界定。本文研究了考虑交通流特性的钢桥墩和钢梁桥的疲劳设计荷载。研究的结构为两车道钢梁桥和支撑两车道简支或三跨连续桥的门式框架钢桥墩。计算了日本《公路桥梁设计规范》规定的t荷载、梁桥跨中心模拟交通流和桥墩刚性连接柱侧的疲劳损伤。采用蒙特卡罗模拟技术对交通流进行模拟。在模拟中，通过改变一些表达交通流和结构特性的值来评估它们对疲劳损伤或爱荷修正系数的影响。将蒙特卡罗模拟得到的钢梁桥疲劳损伤值与疲劳设计建议值进行了比较，验证了其准确性。所得的疲劳损伤也用于梁桥和桥墩活载修正系数的计算。最后，对这些结构提出了新的疲劳设计载荷，并对其有效性进行了验证。