非对称斜拉桥温度效应对索力影响分析

Analysis on Influence of Temperature Effect on Cable Force of Asymmetric Cable-stayed Bridge

以延安市吴起县某斜拉桥为工程背景,建立空间杆系有限元模型,分析了该桥在整体升降温、梯度温度及索梁温差的影响下斜拉索索力的变化规律。结果表明,该桥温度效应对索力影响显著,且不同位置拉索对温度效应的敏感度不同。该结果可对本桥设计阶段调索、施工阶段监控及使用阶段的桥梁健康检测及维护提供参考,并可为类似的斜拉桥工程提供借鉴。

According to the engineering background of a cable-stayed bridge in Wuqi County of Yan'an City,a space member system finite element model is established to analyze the change rule of stayed cable force of this bridge under the influence of overall temperature variation, gradient temperature and cable-beam temperature difference. The results show that the temperature effect has an obvious influence on the cable force, and the sensitivities of the cable force to the temperature effect are different in the different positions.The results can be referred for the cable adjustment in the design stage of this bridge, the monitor in the construction stage and the health inspection and maintenance of the bridge in the service stage, and can be also referred for the construction of the similar cable-stayed bridges.