PC斜拉桥的时变分析──确定性分析

Time-Dependet Analysis of PC Cable-Stayed Bridge-Certainty Analysis

通过对现有各种理论的研究和比较，认为Trost-Basant提出的“按龄期调整的有效模量法”是适合于PC斜拉桥分阶段施工特点的收缩徐变计算理论。根据该理论推导了新的增量形式的时变方程式，通过编程运算，可以将结构在各个阶段有节点力和位移的增量在一次运算中求出。同时还选用了目前广泛采用的多种收缩徐变模式进行了比较计算，认为BP-KX模式较适合于PC斜拉桥的时变分析。并通过对运营13年后的红水河铁路斜拉桥的实桥测试，将试验数据与计算结果进行分析比较，进一步论证了所提出的理论和方法的可行性，同时还得出了几点有意义的结论。

The authors compare different existing theories and picked out the Age-Adjusted Effective Modulus Method presented by Trost-Bazant as one that fits in with the stage-bystage construction procedure of PC cable-stayed bridges. Following this theory, a new incremental time-dependent equation is derived which enables the calculation, through one programed computer operation, of the forces and displacements at all nodes of the structure under different construction stages. Moreover, the BP-KX Model is opted from among different kinds of shrinkage and creep models in current use to be fitting in better with the time-dependent analysis for PC cable-stayed bridge. By comparing the calculated results with site measurements obtained from the Hong Shui River Railway Bridge which has been in service for 13 years, the applica bility of the proposed theory and method is further verified. In addition, several meaningful conclusions are made.