大跨径斜拉桥桥面铺装在活载作用下的力学特点

应用有限元分析软件MIDAS对润扬长江公路大桥北汊斜拉桥进行了成桥阶段的静力分析,并将计算得的整桥力学特点通过局部模型边界条件,反映在局部正交异性板桥面铺装有限元模型上。研究表明斜拉桥主梁轴向受力这一力学特点对桥面铺装将产生直接的影响。跨中主梁轴向受拉部分增加了该处桥面铺装的纵向拉应力,非跨中主粱轴向受压部分削减了该处桥面铺装的纵向拉应力。因此在做同类型的桥面铺装设计时,应以跨中截面作为控制截面。

Mechanical Specific Character of Long-span Cable-stayed Bridge Pavement under Live Loading

In the paper, the static characteristics of the cable-stayed bridge of Runyang are analyzed by using Finite Element Method. To analyze the mechanical characteristics of the bridge pavement, the static characteristics of the cable-stayed bridge are transferred to the model of orthotropic steel bridge deck through the model's boundaries. The result shows that the axial tension of the beam increases the pavement's longitudinal tension stress while the axial compression decreases the pavement's longitudinal tension stress. When we design the pavement of the cable-stayed bridge, we should take the midspan section as the control section.