钢-混叠合梁斜拉桥恒载索力优化分析

Analysis on Optimization of Dead Load Cable Tension of Cable-stayed Bridge with Concrete-Steel Beam

为使钢-混叠合梁斜拉桥索力得到最大程度的优化,利用ANSYS有限元软件对某实际工程进行建模、施加约束及荷载、求解等步骤之后,调用软件的优化分析模块,以主梁的弯曲应变能作为目标函数,各拉索索力作为设计变量,采用一阶分析法进行迭代优化,从而获得优化的拉索索力。分析结果表明:该优化方法是准确、有效的,可以用于叠合梁斜拉桥的索力优化;叠合梁斜拉桥优化后的各索索力及索力分布规律对同类型叠合梁斜拉桥达到合理成桥状态时的索力判定及调整具有一定的指导意义。

In order to optimize the cable tension of cable-stayed bridge with concrete--steel beam, the model for a bridge project was built with ANSYS, and constraints and loads were applied. The optimized cable tension was obtained by calling the optimization analysis module of ANSYS, using the bending strain of main beam as objective function, setting each cable tension as design variables and applying first-order methods for iterative optimization. The results show that the optimization is accurate and effective, and the distribution of cable tension after the optimization helps to determine and adjust the cable tension when the bridge is completed.