组合梁斜拉桥合理成桥状态确定方法对比分析

THE COMPARATIVE ANALYSIS OF DETERMINING METHODS FOR THE REASONABLE FINISHED STATE OF CABLE-STAYED BRIDGE

为探究大跨度组合梁斜拉桥合理成桥状态确定方法的特点及异同,以西固黄河大桥为背景,用影响矩阵法和最小弯曲能量法分别对其进行索力优化,其中影响矩阵法以两桥塔间的主梁合理线形为目标函数,最小弯曲能量法以大桥的弯曲应变能为目标函数,分别确定了对应的合理成桥状态。最后对两种成桥状态下的优化索力、主梁线形和主塔弯矩进行了对比,通过对比发现两种方法确定的优化索力相差较大,结构线形和弯矩也不同。

In order to explore the characteristics and differences of the methods for determining the reasonable finished state of long-span cable-stayed bridges with composite beam.Taking Xigu Yellow River Bridge as engineering background,this article has used the influence matrix method and the minimum bending energy method to optimize its cable force.The objective function of influence matrix method is the linear of beams.However another one is the energy of this structure reached the minimum one.Both method can get the reasonable state of Xigu Yellow River Bridge.Finally,this paper compared the cable force,linear of the beam and the moment of main tower of this two methods.By comparing this two method,we can see the cable forces abtained by two methods have a large difference,and the geometry and bending moments are also disparate.