考虑主缆弯曲刚度后对悬索桥的影响

通过完全无弯曲刚度的链条“主缆”模型与有一定弯曲刚度的铁丝“主缆”模型的对比试验，及针对试验情况所进行的有限元分析，初步研究了考虑悬索桥主缆弯曲刚度后的影响情况。试验结果以及数值模拟计算结果均表明，随着悬索桥跨度的增加，主缆垂跨比的减小，主缆实际存在的弯曲刚度对垂度的影响较大，如果再考虑索夹局部加强作用等的因素，则对一些悬索桥的受力和变形可能产生不利的影响，因此应该考虑主缆实际存在的弯曲刚度。

THE RESEARCH OF INFLUENCE ON SUSPENSION BRIDGES AFTER CONSIDERING BENDING RIGIDITY OF CABLE

With the development of long-span suspension bridges,analysis of cable is more and more precise.But so far,all the analysis is based on the assumption that the influence of bending rigidity on cable is so small and can be ignored.This paper has preliminarily researched the influence after cable of suspension bridges considering bending rigidity,by establishing two contrast modeling tests,the chain-made cable model with no bending rigidity and the wire-made cable model with some bending rigidity,and making the finite element analysis corresponding to the models.Both experiment and numerical simulation results show that bending rigidity of cable which really exists has a greater influence on sag,as the span of suspension bridges increasing along with the sag-to-span of cable reducing.If factors like the local reinforced effects of cable clamp are taken into account,it may have an adverse impact on force and deformation of some suspension bridges.So bending rigidity of cable which really exists should be considered on some analysis of suspension bridges.