自锚式悬索桥损伤吊索系统拉力重分布研究

为研究吊索损伤对自锚式悬索桥吊索系统内力的影响机理,以某主跨160 m的混凝土自锚式悬索桥为工程依托,采用非线性静力分析方法,对吊索不同损伤程度下结构的力学响应进行研究。研究结果表明:吊索损伤引起吊索系统的拉力重分布,主要发生在损伤吊索和与之同跨同侧相邻的2根吊索之间,具有相邻性;相较于单根吊索损伤,相邻2根吊索发生损伤后结构的力学响应更为剧烈,且与这2根吊索分别发生损伤引起同侧吊索拉力重分布的叠加效果几乎等效。研究结果可用于自锚式悬索桥损伤索力控制,同时可为损伤吊索监测提供技术指导。

Study of internal force redistribution of damaged hanger system of self-anchored suspension bridge

In order to study the mechanism of the influence of hanger damage on the internal force of the self-anchored suspension bridge hanger system, a concrete self-anchored suspension bridge with a main span of 160 m was taken as an example. The nonlinear static analysis method was used to study the mechanics of the structure under different damage degrees of the hanger. The response was analyzed. The results show that the hanger damage causes the redistribution of the tension of the hanger system, which mainly occurs between the hanger and the two hangers adjacent to the same side of the hanger, with adjacency. Compared with the single hanger, in the damage, the mechanical response of the structure is more severe after the damage of two adjacent hangers, and the superposition effect of the two hangers respectively causing the damage of the same side hanger tensile force is almost equivalent. The research content can be used to control the damaged cable force of self-anchored suspension bridge and provide technical guidance for the monitoring of damaged sling.