超宽斜拱塔斜拉桥桥面板横向应力分析

The bridge deck transverse stress analysis of super-wide oblique arch tower cable-stayed bridge

在超宽斜拱塔斜拉桥结构设计中为了考虑桥面板横向空间效应的影响,在桥面板整体分析的基础上对局部受力复杂部位进行应力分析。通过工程实例,选取混凝土标准梁段,用ANSYS建立有限元计算模型,考虑结构自重、预应力、温度梯度、活载等荷载工况,对混凝土桥面板进行横向应力分析。研究表明,结构自重、梯度降温、活载对桥面板横向应力影响较为明显,局部受力复杂部位出现应力集中现象。文章最后总结出双边箱桥面板在各种荷载工况作用下的受力特点,为超宽斜拱搭斜拉桥的合理结构设计和施工提供有益的参考依据。

To analyze the impact of the bridge deck transverse spatial effects on the structural design of super-wide oblique arch tower cable-stayed bridge, a stress analysis of local complex stress areas is needed besides the overall structure analysis. In this research, with the concrete standard beam section in a practical construction as case study, a finite element model based on ANSYS is established; then the bridge deck transverse stress under different conditions, such as structure weight, prestress, temperature gradient, the live load and etc. are analyzed. According to this research, elements like structural weight, cooling gradient, and live load on bridge deck exert more obvious effects on transverse stress, and stress concentration is found in local complex areas. The paper finally summerizes some mechanical characteristics of the bilateral box bridge deck, which proves that it is rational and useful to design and construct the super-wide bilateral box cable-stayed bridges.