关键词: 非线性静力, 斜张桥, 动力分析, 临界风速, 拉索, 自振特性, 振型, 迭代法, 空间组合, 动态非线性

Abstract: In this paper a space computation model for cable-stayed bridges is proposed. Having introduced the eccentric space thin-walled girder and the space combined cable elements, the author has derived element elastic stiffness matrix, geometric stiffness and masse matrix. The nonlinaer behaviour of cable tension which depends on the change of deflection is included in equivalent geometric stiffness. The nonlinear behaviours of beam and tower resulting from axial-flexual deformed interaction are considered. The nonlinear static equations are solved by modified iterative method. In dynamic analysis with the consideration of axial force effect the natural vibration property for systems of plane and spave is computed in consistant-mass matrix, so that data can be provided for determining critical wind velocity. In dynamic response analysis (earthquake and vehicle vibration) dynamic nonlinaarity is considered by using linearized mode superpostion method in order to use middle-small sized computers.