部分斜拉桥合理成桥状态的研究

部分斜拉桥结构以主梁受弯来承受大部分荷载,拉索索力可改善主梁受力状态,因此部分斜拉桥与斜拉桥一样,通过优化拉索索力来确定部分斜拉桥合理成桥状态下的内力非常必要。采用影响矩阵法原理,以结构应变能最小作为目标函数,对索力加以合理的约束条件,解决了多变量非线性函数的有约束优化问题,从而获得恒载作用下的最优索力和与之对应的合理成桥状态。并对已建部分斜拉桥索力进行实例优化分析。

Research on Rational State of Accomplishment of Partial Cable-stayed Bridge

In the partial cable stayed bridge the main beam takes most of the load,while the forces in the cable can change the internal-force state of the main beam into better condition.So it is necessary to optimize the cable forces to make sure the most rational state of partially accomplished cable stayed bridge.Based on the affection matrix theory,the non-linear optimum problem with many variances and restrictions was successfully solved with the minimum energy of the stress in the structure as target function with rational restriction of the cable forces.Furthermore,the most optimum cable force and the corresponding rational state of accomplished bridge were(obtained.)As an example,an optimum analysis was carried out of the cable forces of partially accomplished cable bridge.