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.

高速公路桥的设计代码的最新版本指定应进行疲劳设计。设计方法的详细信息在疲劳设计建议中描述。但是，对于各种交通流量，疲劳损伤验证的准确性尚不清楚。此外，它对钢桥墩的适用性尚未明确定义。在这项研究中，研究了考虑交通流量特征的钢桥墩和钢梁桥的疲劳设计负荷。研究的结构是两车道钢梁桥和门户框架钢桥墩，这些桥墩支撑了两车道，或者是三跨连续桥。计算了日语设计代码中指定的高速公路桥梁中指定的疲劳损坏，并计算了桥梁桥的跨度中心的模拟交通流量，并计算了桥梁码头中刚性连接的圆柱侧。蒙特卡洛模拟技术用于产生交通流量。在模拟中，一些表达交通流量和结构特性的值会更改以评估它们对疲劳损害或爱负荷修饰因子的影响。将通过蒙特卡洛仿真获得的钢梁桥的疲劳损坏与通过疲劳设计建议计算出来的精度进行了比较。所获得的疲劳损伤还用于评估活载荷修饰因子远处桥桥和桥墩。最后，提出了针对这些结构的新疲劳设计负载，并确认了它们的有效性。