新园斜拉桥合理索力的确定

Determination of Rational Cable Force for Xinyuan Cable-stayed Bridge

采用基于正装分析的试算法,确定了新园斜拉桥的拉索初始张拉力。分别以结构弯曲应变能最小及弯曲与拉压应变能之和最小为目标函数,对该桥的成桥索力进行优化计算,并与刚性支承连续梁法确定的成桥索力进行了对比分析;然后经过索力局部调整,最终确定了该桥的合理成桥索力,可为斜拉桥合理成桥索力的确定提供了有益的借鉴方法。

Trial method based on the forward analysis was used to determine the initial cable force of Xinyan cable-stayed bridge. Cable force was calculated by the least bending strain energy and the least sum of bending, tensing and pressing strain energy,, and it was compared with cable force determined by rigid bearing continuous beam. Then the rational cable force was determined through regulating cable force. Cable force determined by the least strain energy of cable-stayed bridge is rational.