不同单元形式对悬索桥受力分析的影响

应用有限元方法对悬索桥进行受力分析时，可采用轴向拉力对刚度贡献的桁架单元或索单元来模拟主缆和吊杆，分别在ANSYS程序中用桁架单元和Midas／Civil结构分析程序中用受拉索单元来模拟主缆和吊杆对算例悬索桥进行静力分析，给出应用这两种单元模式进行悬索桥结构分析的差异，得出用桁架单元代替索单元并用Ernest公式修正弹性模量以考虑索的垂度效应的近似方法精度和适用条件，进而给出用非线性杆系有限元法进行悬索桥受力分析的结论性建议。

Influence of Different Elements on Suspension Bridge Analysis

When the finite element method is used to analyze the suspension bridge, the truss element or cable element can be used to simulate the main cable and the hanger. The truss element in ANSYS and tension cable element in Midas/Civil are used to simulate the main cable and the hanger while a nonlinear static analysis of exemplified suspension bridge is carried through. The difference between calculated results from different elements is also given. Finally, the accuracy and applicable conditions about the approximate method of using truss element to replace cable element are presented, and the elastic modulus is amended by means of Ernest. Formulas. Moreover, a conclusive proposal on the analysis of suspension bridge subjected to loads is also presented.