温度对拱桥短吊杆应力的影响

Influence of Temperature on Short Suspender Stress of Arch Bridge

既有拱桥健康检测结果表明,短吊杆是拱桥易损构件之一。该文主要研究温差荷载对拱桥短吊杆截面应力的影响。假定短吊杆两端与拱肋及桥面均为固结,首先通过吊杆表面温度实测数据得出吊杆沿周向温度分布规律,再根据径向温度梯度得出吊杆横截面温度分布模型。然后,根据温度分布模型探讨短吊杆局部温差应力的大小及分布规律。同时,结合整体温差荷载作用下吊杆截面应力的理论推导和参数分析,探讨了吊杆截面不均匀应力分布情况及应力增大系数的范围。

The health inspection result of the existing arch bridges shows that the short suspender is one of the most vulnerable components of arch bridges.If two ends of the short suspender are concreted with the arch rib and bridge deck,the measured data of surface temperature of the suspender can give the distribution law of temperature around the suspender,and the radial temperature gradient can give the cross-sectional temperature distribution model of suspender.The article discusses the local temperature difference stress and its distribution law of short suspender according to the temperature distribution model.Based on the theoretical derivation and the parameter analysis of the suspender section stress in the overall temperature difference load,the article discusses the non-uniform stress distribution of suspender section and the range of stress magnification coefficient.