大跨环形矮塔斜拉桥主塔力学性能分析

Mechanical Performance Analysis of the Main Tower of Large-span Annular Extradosed Cable-stayed Bridge

以大跨度环形矮塔斜拉桥的主塔为研究对象,借助大型有限元程序midas进行了静力及地震动时程分析,通过提取杆系模型中的最不利内力,对索塔锚固区及下塔柱钢混结合段空间应力进行分析。结果表明:1)钢塔在静力及地震工况下强度及稳定均满足要求;2)索塔锚固区及钢混结合段应力状态良好、构造细节处理较为合理。

This paper takes the main tower of the large-span annular extradosed cable-stayed bridge as the research object.The static and time-history analysis was carried out by using the large finite element program Midas.The spatial stress of anchorage zone of the cable and the steel-concrete joint section of the lower pier was analyzed by extracting the most unfavorable internal forces in the beam-column model.The results show that:1)the strength and stability of the tower meet the specifications under static and seismic conditions;2)The stress state of the cable tower anchorage zone and the steel-concrete joint section is normal,and the structural detail treatment is reasonable.