拉索弹性模量时效改变对斜拉桥抗震性能的影响

文章以在建的某斜拉桥为实例,结合ANSYS重启动功能及参量瞬变命令,编制了基于真实初始静平衡状态下及斜拉索Eep时效改变下的地震动几何非线性时程响应通用求解程序,并与以初始索力为计算依据的斜拉索Eep时效不变状态下的计算结果进行了对比分析,得出拉索弹性模量时效改变对斜拉桥抗震性能的影响规律,为大跨斜拉桥地震响应的合理计算分析和抗震设计提供参考。

Effects of Time varying with Elasticity Equivalent Modulus of Cable on Seismic Behavior of Cable stayed Bridge

Effects of time-varying with Ernst＇s equivalent elasticity medulus（Eep） of cables on seismic behavior of cable-stayed bridge is carded out in the paper. Taking a cable-stayed bridge for example, a general program to solve the geomet - rical nonlinear seismic time-history response was established based on the state of truly initial static equilibrium and time-varying effects with Eep of cables,the solution was compared with the results under the time-invariant Eep of cables calculated by the initial cable tension.It is indicated that time-varying of Eep played a role to the stress and deformation of cable-stayed bridge.In state with big initial sag, the bigger the variation of tension vibration amplitude of cables, the larger the role was.After taking the effects of time-varying with Eep into account,the maximum amplitude of vibration tension of cable in mid-span reduced and the minimum one increased;the positive displacement amplitude of the mid-span in the vertical direction increased and the negative one reduced; correspondently, the positive envelope values of in-plane moment of beam in the range of main span reduced and the negative one increased.