混合梁斜拉桥合理成桥状态确定方法研究

摘要

In order to obtain the optimal values of cable force ,and determine the reasonable finished bridge state for large span composite girder cable‐stayed bridge ,the space finite element simulation a‐nalysis model of the w hole bridge is established .Considering the characteristics of its span arrange‐ment and structure ,the method and basic principles for determining the reasonable finished bridge state is analyzed ,calculated with the influence matrix method and minimum bending energy method , and the objective function is minimization the maximum displacement of tower and girder .Through calculation ,the stress of the main pylon ,the main girder and the stay cables in the finished state and the operating state can satisfy the requirements of standard , the reasonable finished state of cable‐stayed bridge in accordance with the requirements .%为了更好的得到较优的斜拉索索力值，确定大跨度混合梁斜拉桥的合理成桥状态，建立了全桥的空间有限元仿真分析模型，针对大跨度混合梁斜拉桥的跨径布置和结构特点，分析合理成桥状态的确定方法和基本原则，确定了其合理成桥状态采用了影响矩阵法和最小弯曲能量法两种方法综合计算，并以主塔和主梁的最大位移最小为目标的方法。经计算，结构在成桥状态和运营状态下的主梁、主塔和斜拉索应力均满足规范要求，确定的斜拉桥合理成桥状态符合要求。