湘潭市湘江四桥系杆锚固区局部应力分析

针对湘潭市湘江四大桥主跨结构为(120 400 120)m的斜拉钢管混凝土系杆拱桥,该桥系杆锚固于混凝土边主梁上,系杆锚固区受力状态复杂的情况,基于有限元分析,发现设计结构存在局部拉应力过大的现象,为了解决该问题,对系杆锚固区的结构设计进行修改及进一步力学分析,提出减小锚固槽壁及支座对锚下变形约束的结构设计思路和具体措施,以实现减小局部应力的目的。所得结论和建议可供同类结构设计参考。

Local stress analysis in the tie bar anchorage zone of the forth Xiangjiang river bridge in Xiangtan

The forth Xiangjiang river bridge in Xiangtan is a (120 400 120) m cable-stayed tired-arch steel tube confined concrete bridge.The tie bars are anchored in the concrete main beams of the side span.Based on the finite element analysis,the oversize local tensile stress exists in the structure.In order to solve this problem,the structure design of the anchorage zone was modified and the further mechanics analysis was made.Also the design methods and specific measures,that reduce the restriction for anchorage deformation provided by the anchorage trough wall and the support,were put forward.The result shows that the local stress decreases.The conclusions and suggestions are useful to the design for similar structure.