塔墩梁固结的三塔四跨矮塔斜拉桥成桥状态力学参数研究

摘要

In order to improve the construction control precision of pier-tower-beam rigid frame extradossed cable-stayed bridge with three towers and to provide theoretical basis for parameter identification and error correction, the sensitivity of design parameters are analyzed for an extradossed cable-stayed bridge. The influences of the design parameters on the deflection of girders, the stress of girders, the cable force and the displacement of towers in the bridge's finished state are compared. The results indicate that the main influence parameters are the weight of concrete, the tensile cable force, the seasonal temperature differences, and the temperature difference between cable and girder. The elastic modulus of concrete, the sunshine thermal and the temperature difference between two sides of towers have a little influence on the finished state of the bridge. The results have reference to the same kind of bridges construction.%为了提高塔墩梁固结的三塔四跨矮塔斜拉桥的施工控制精度,为后续的参数识别和误差修正提供理论基础,以国内某矮塔斜拉桥为工程背景,通过计算比较各设计参数在成桥状态时对主梁线形、应力、成桥索力和主塔偏位的影响,分析各设计参数的敏感性.研究结果表明:主梁容重、拉索初张力、季节温差和索梁温差为主要设计参数,而混凝土弹模、日照温差和索塔两侧温差对成桥状态的影响较小,为次要参数.研究结果可为同类型斜拉桥的施工控制提供参考.