中承式拱桥吊索损伤对吊索系静张力的影响

基于中承式拱桥的有限元建模,考虑到吊索损伤对吊索拉伸刚度的影响,运用一阶矩阵摄动理论,采用刚性拱模型,研究了中承式拱桥吊索损伤对吊索系静张力的影响,导出了吊索系张力矢量因损伤变化的表达式,并用工程实例进行计算机仿真研究。研究结果表明:吊索的损伤会引起吊索系静张力的重新分布,即引起损伤吊索自身静张力的减小及邻近吊索静张力增大,随着损伤的增大,这种变化也逐渐增大;损伤大小与吊索静张力的变化呈近似的线性关系。这一结果对中承式拱桥吊索损伤的检测有实际参考价值。

Effect on sling system tension from sling damage in mid-supported arch bridge

Based on the finite element model of a mid-supported arch bridge, the effect of sling damage on static tension of sling system is researched. An engineering example is studied from simulation. The research result indicates that the sling damage can lead to tension change in the damage sling itself and the sling near the damage sling. The change of sling tension increases when the damage becomes more serious. The research result is valuable to the practical damage detection of sling in mid-supported arch bridge.