无背索曲塔曲梁斜拉桥参数敏感性要点详解.doc

无背索曲塔曲梁斜拉桥参数敏感性分析 刘世明1,2 刘永健1 （1.长安大学 桥梁与隧道陕西省重点实验室，陕西西安 710064；2.华北水利水电学院 土木与交通学院，郑州450011；） 摘 要：以为工程背景，采用MIDAS/CIVIL有限元分析软件，考虑，。结果表明：。关键词：；；；中图分类号：U448.22 文献标识码：A Sensitivity Analysis of Parameters for Curved-pylon and Curved-girder Cable-stayed Bridge without Back-stays LIU Shiming，LYongjian （1.Key Laboratory for Bridge and Tunnel of Shaanxi Province, Changan University, Xian 710064,china;2.North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011, China;） Abstract：corresponding to the design value at the completion of the bridge construction, according to the construction of Dongguanshuidao bridge, which is a curved-pylon and curved-girder cable-stayed bridge, the analytical model is founded through the finite element analysis software MIDAS/CIVIL, and the parameters change such as structural unit weight and concrete elasticity modulus and cable elasticity modulus and temperature action are considered, sensitivity analysis of the parameters are carried out. The results show that the sensitive parameter of the deformation of the beam at the direction of y axis is temperature, and the sensitive parameters of the deformation of the beam at the direction of z axis and stress of the beam and the deformation of the top pylon and the stress of the pylon bottom are temperature and structural self-weight; the maximum deformation increment at the direction of z axis of the beam is -12.2mm caused by temperature drop, which is located at 1/4 point of the main span; temperature drop can cause the stress increment of the upper and lower beam and the stress differences of the left side and right side of upper and lower beam section are greater, torsion is obvious, the deformation increment caused by temperature drop of the top pylon at the direction of x axis, y axis and z axis are 7.4mm, 3.2mm and -21.3mm respectively, the tensile stress is occurrence at the upper and lower edge of pylon bottom section when temperature drop, the maximum tensile s