【作者】 严圣友；

【导师】 项贻强；

【作者基本信息】 浙江大学 ， 桥梁与隧道工程， 2004， 硕士

【摘要】 本文以钢管混凝土拱桥为研究对象，借助于平面有限元计算程序GQJS以及大型通用空间有限元分析程序ANSYS，对钢管混凝土拱桥在不考虑非线性效应即线弹性范围内的静力和动力特性进行了理论分析，在此基础上，进行了静力和环境脉动以及激振情况下的动力试验研究；另外，鉴于稳定性问题是钢管混凝土拱桥中比较突出的一个问题，文中对拱桥的稳定性和极限承载力进行了探索研究，在稳定性分析中，分别进行了特征值稳定性分析、考虑几何非线性的稳定性分析以及考虑双重非线性的稳定性分析，分析了拱肋的材料类型对极限承载力的影响。理论分析和试验研究表明：对钢管混凝土组合结构进行简化计算时，采用换算截面法的计算精度较采用统一模量法的高；本文根据实际截面建立钢管混凝土拱桥空间模型的计算精度较高，且建模简单易行，与实际结构测试值吻合较好；对钢管混凝土拱桥采用振动—频率法测试吊杆的索力，由于其吊杆相对较短，计算中应考虑抗弯刚度和边界条件的影响；钢管混凝土拱桥的风撑对稳定性影响很大，拱脚处的X撑对稳定性的影响不大，双重非线性对稳定性的影响很大，几何非线性对稳定性的影响相对较小；与相同结构类型的拱桥比，采用钢管混凝土拱肋时其承载力较高，且经济性和延性较好。更多还原

【Abstract】 The CFST arch bridge is taken as the subject investigated in this paper. With the planar finite element program-GQJS and the great general spatial finite element program-ANSYS, the linear elastic static and dynamic analysis of the CFST arch bridge is done, based on which, the static and dynamic experimental investigation is also done. For the CFST arch bridge, the stability problem is more prominent. The stability and the ultimate bearing capacity of the CFST arch bridge are studied in the paper. In the stability analysis, both the eigenvalue stability problem and the nonlinear stability problem are analyzed. The influence of the arch rib’s material on the ultimate bearing capacity is also analyzed. Indicated by the theory analysis and the experimental investigation, when the CFST structure is calculated by the simplification method, the calculation accuracy using the transformed section method is higher than using the uniform modulus .method. According to the true section, the spatial model of the CFST arch bridge is established. This method is simple and feasible, and the calculation result is more close to the values obtained by testing the true structure. The force of the boom’s cable of the CFST arch bridge is indirectly measured by adopting vibration-frequency method, because the boom of the CFST arch bridge is short relatively, the influence of the flexural rigidity and the boundary condition should be taken into account in the calculation. The wind brace and the double non-linearity affect greatly on the CFST arch bridge’s stability, while the influence of the X brace near the arch springing and the geometrical non-linearity-on the CFST arch bridge’s stability is little relatively. If the arch rib of the arch bridge uses the CFST material, the ultimate bearing capacity is high, and the economical efficiency and the ductility is good.更多还原