轴力作用下钢桥面板构造细节受力分析

Stress Analysis on Structural Detailsof Orthotropic Steel Bridge Deck under Axial Force

为研究正交异性钢桥面板在轴力作用下的受力情况,建立全桥杆系有限元模型,获取钢桥面板所受轴力信息;建立钢桥面板局部有限元模型,提取各工况下疲劳细节关注点处应力,分析应力的变化情况,获取各疲劳细节最不利加载工况,比较研究最不利加载工况下各构造细节在轴力作用下的疲劳性能。结果表明,轴力对各细节应力幅影响较小,对U肋与横隔板围焊处和横隔板焊趾处平均应力影响较大,对U肋与顶板焊缝和弧形缺口平均应力影响较小。

In order to study the stress of orthotropic steel bridge deck under axial force,the finite element modle of whole bridge was established,and the axial force information of the steel bridge was obtained.The local finite element model of the steel bridge deck was established,and the stress at the fatigue details under each working condition was extracted,and the stress change was analyzed,and the most unfavorable loading conditions for each fatigue detail was obtained.The fatigue performance of each structure detail under the action of axial force under the most unfavorable loading condition was compared and studied.The results show that the axial force has little influence on the stress amplitude of each detail,has a great influence on the average stress of the toe on U-rib and the toe on diaphragm,and has a little influence on the average stress of the U-rib roof weld and the arcshaped notch.