钢桥面板顶板-U肋焊缝剪应力分布规律研究

Study on Shear Stress Distribution Law of U-rib-to-deck Weld in Steel Bridge Deck

摘要

正交异性钢桥面板顶板-U肋焊缝疲劳裂纹受剪应力影响突出。为研究车辆荷载作用下顶板-U肋焊缝剪应力特点,建立了正交异性钢桥面板节段有限元模型,分析了正交异性钢桥面板在轮载作用下受力变形特征,探究了顶板-U肋焊缝剪应力随轮载移动的变化规律以及顶板-U肋变形对剪应力分量的影响。结果表明,顶板-U肋过焊孔处焊缝剪应力被轮载影响的范围为相邻2个舱室(约6400mm),且一轮位于横隔板上方时剪应力达到峰值。过焊孔处焊缝横桥向剪应力大于舱室中间位置,而舱室1/8跨、1/4跨纵桥向剪应力大于过焊孔处。通过施加单向等效位移荷载,发现顶板-U肋竖向整体下挠主要会引起焊缝纵桥向剪应力;焊缝横桥向剪应力主要由竖向整体下挠及U肋变形协同引起,且U肋局部变形不是引起纵桥向剪应力的主要原因。

Abstract

The fatigue crack of the U-rib-to-deck weld of the orthotropic steel bridge deck is significantly affected by the shear stress. To investigate the shear stress characteristics of these welds under vehicle loads, a segmental finite element model of an orthotropic steel deck was established. The stress and deformation characteristics of the orthotropic steel bridge deck under wheel load were analyzed. The variation law of the shear stress of the U-rib-to-deck weld with the movement of the wheel load and the influence of the U-rib-to-deck deformation on the shear stress component were explored. The results show that the shear stress of the weld at the access hole of the U-rib-to-deck is affected by the wheel load in two adjacent cabins (about 6400 mm) and the shear stress reaches the peak when one wheel is located above the cabin. The transverse shear stress of the weld at the access hole is greater than that in the middle of the cabin, while the longitudinal shear stress of the 1/8 span and 1/4 span of the cabin is greater than that at the access hole. By applying unidirectional equivalent displacement load, it is found that the longitudinal shear stress of the weld is mainly caused by the vertical overall deflection. The transverse shear stress of the weld is mainly caused by the vertical overall deflection and the deformation of the U-rib, and the local deformation of the U-rib is not the primary cause of the longitudinal shear stress.

关键词

桥梁工程 / 钢桥面板 / 顶板-U肋焊缝 / 受力特征 / 数值模拟

Key words

bridge engineering / steel bridge deck / U-rib-to-deck weld / stress characteristic / numerical simulation

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基金资助

国家自然科学基金面上项目(52378153)