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.

最新版公路桥梁设计规范规定应进行疲劳设计。设计方法的详细信息在疲劳设计建议中进行了描述。然而，对于各种交通流，疲劳损伤验证的准确性尚不清楚。此外，其对钢桥墩的适用性也没有明确的规定。在这项研究中，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桥或三跨连续桥的门式刚架钢桥墩。计算了日本公路桥梁设计规范中规定的T荷载引起的疲劳损伤以及梁桥跨中心和桥墩刚性连接柱侧的模拟交通流。蒙特卡罗模拟技术用于产生交通流。在模拟中，一些表达交通流和结构特性的值被改变，以评估它们对疲劳损伤或爱荷载修正因子的影响。将蒙特卡罗模拟得到的钢梁桥疲劳损伤与疲劳设计建议计算的疲劳损伤进行比较，检验其准确性。获得的疲劳损伤也可用于评估远梁桥和桥墩的活载修正系数。最后，提出了这些结构的新疲劳设计载荷，并证实了其有效性。