摘要
正交异性钢桥面板承受着车辆动荷载的反复作用,容易造成疲劳累计损伤,导致钢桥面板出现疲劳开裂现象。为研究某城市桥梁钢桥面板的疲劳寿命,建立钢桥面板有限元模型,选取钢桥面板4种典型疲劳细节,根据实测所得到的城市车辆荷载频值谱,计算得到相应的应力历程和应力谱。基于线弹性断裂力学理论,对这4种疲劳细节进行疲劳寿命分析,结果表明:在桥梁设计基准期内钢桥面板不会发生疲劳破坏。
An orthotropic steel bridge deck endures the repeated action of vehicle dynamic loads, it is easy for fatigue cumulative damage to occur,which will lead to .the fatigue cracking of the deck. For the study of fatigue life of the bridge deck in a city, a finite element model of the steel decks was set up, and four kinds of typical fatigue details of the decks were selected, based on the measured frequency value spectrum of urban vehicle load, the corresponding stress history and stress spectrum were calculated. Based on linear elastic fracture mechanics theory, the fatigue life of these four details was analyzed, the results showed that fatigue damage would not occur during the bridge design reference period.
出处
《钢结构》
北大核心
2015年第5期33-35,共3页
Steel Construction
基金
国家自然科学基金资助项目(51478120
51108087)
