大跨度混合梁斜拉桥合理成桥状态的确定

以九江长江大桥为工程背景,以平面杆系有限元程序FBR_CAL_SUO和SUS_CAL_SUO为计算软件,采用恒载平衡法、应力平衡法和最小二乘法相结合的综合法,以控制结构在正常使用荷载作用下主梁的上、下缘的最大、最小应力为主要目标,以调整索力为主要手段,综合考虑恒载、活载、预应力及配重荷载等因素的影响,采用基于正装计算的优化法确定合理成桥状态。以这种方法确定的合理成桥状态与设计数据相比较,比较结果表明,这种方法的结果是准确、可靠的。

Determination on Reasonable Finished State of Long-span Composed Beam Cable-stayed Bridge

Based on the engineering background of Jiujiang Yangtze River Bridge,applying the calculation software of the plane frame finite element program FBR_CAL_SUO and SUS_CAL_SUO,and using the synthesis method of dead load balance method,the stress balance method and the minimum squares method,by the main objective of controlling the maximum and minimum stresses of the upper and lower edges of the main beam under the normal using load of the structure and the main means of adjusting the cable force,the article comprehensively considers the influence of dead load,living load,pre-stressing and heavy load,and determines the reasonable finished state of bridge by the optimized method based on the forward calculation.Compared with the design data,the result of this method to determine the reasonable finished state makes clear that this method is accurate and reliable.