单拱面预应力混凝土系杆拱桥空间稳定极限承载力分析

Ultimate load analysis on spacial stability of single arch bowsting prestressed concrete bridge

基于 U.L.列式单元增量平衡方程 ,采用单元节点截面内力塑性系数法建立钢筋混凝土空间梁单元弹塑性刚度矩阵 ,并编制了单拱面预应力混凝土系杆拱桥空间稳定极限承载力计算程序。理论分析结果与两个模型试验结果良好接近 ,验证了分析方法的正确性。

The elasto plastic matrix of space beam element to calculate the single arch bowsting prestressed concrete bridge is established and the program is compiled.This method is based on the U.L. formula and the plastic coefficient method of element section internal force.The analysis results and the experiment results of two test models have a good agreement,the reliability of the method and program is tested.The safety factor of elasto plastic stability and the ratio of width to span of arch is discussed initially.