摘要
为确定不同等级公路钢桥面板的疲劳荷载模型,以某钢箱梁斜拉桥为例,建立钢箱梁节段有限元模型,分析钢桥面板典型疲劳细节的应力影响线特征,选取不同等级的5条公路,通过动态称重(WIM)数据获取交通荷载分布,将实测疲劳荷载谱在典型疲劳敏感细节上进行影响线加载,计算实际车流下各细节的疲劳损伤并确定主导致伤车型,基于等效损伤原理确定钢桥面板疲劳荷载模型,并验证疲劳荷载模型的适应性。结果表明:不同等级公路钢桥面板的疲劳荷载模型不同,高速公路为六轴卡车,一级、二级公路为四轴卡车,三级、四级公路为二轴卡车;提出的疲劳荷载模型能够较好地代表不同等级公路的实际交通荷载水平。
To determine the fatigue load models for the steel bridge decks of the highways of different classes, a steel box girder cable-stayed bridge was taken as an example, the finite element model for the steel box girder segment of the bridge was built up and the stress influence line characteristics of the typical fatigue details of the steel bridge decks were analyzed. 5 highways of the different classes were selected and the traffic load distribution of the highways was acquired based on the weigh-in-motion (WIM) data. The influence lines of the typical fatigue-sensitive details were loaded, using the measured fatigue load spectra, the fatigue damage of the different details under the actual truck flow was calculated and the vehicle types that mainly caused the damage were made certain. On the principle of equivalent damage, the fatigue load models for the steel bridge decks were determined and the applicability of the models was verified. The results demonstrate that the fatigue load models for the steel bridge decks of the highways of the different classes are different, of which the model for the expressway is the six-axle truck, for the highways of Classes I and II is the four-axle truck and for the highways of Classes III and IV is the two-axle truck. The fatigue load models proposed in this paper can well represent the actual traffic load levels of the highways of the different classes. © 2017, Journal Press, China Railway Bridge Science. All right reserved.
出处
《桥梁建设》
EI
CSCD
北大核心
2017年第2期31-36,共6页
Bridge Construction
基金
国家重点基础研究发展计划(973项目)子题(2015CB057703)
国家自然科学基金项目(51578073)~~
关键词
公路桥
钢桥面板
疲劳荷载模型
动态称重
影响线
疲劳损伤
有限元法
highway bridge
steel bridge deck
fatigue load model
weigh-in-motion
influence line
fatigue damage
finite element method
