悬索桥主缆成桥线形确定的有限元新算法

New Finite Element Algorithm for Determination of Geometric Shape of Completed Bridge Main Cable of Suspension Bridge

为提高悬索桥主缆线形确定的有限元算法的执行效率,对单悬索结构ANSYS程序找形原有算法的不足进行分析,提出模型更新位移预测和残差补偿算法。该算法通过主动预测的变步长来更新模型,并采用有效方法来处理大步长更新所带来的不利后果。采用该新算法对2座桥进行计算,结果表明该新算法找形分析的计算结果可靠,计算精度及效率高。

To improve the executing efficiency of the finite element algorithm for determina tion of geometric shape of the completed bridge main cable of suspension bridge, the deficiency of the original shape-finding algorithm in the ANSYS program for single main cable suspension structure is analyzed and the displacement prediction and residual error compensation algorithm for model updating is proposed. The proposed new algorithm can update the model by the actively predicted variable step size and can handle the unfavorable results produced by the model updating of large step size by the effective method. With the new algorithm, the main cables of two suspension bridges are calculated and the results prove that the calculations of the shape finding analysis in the new algorithm are reliable and the calculation precision and efficiency are high.