钢管混凝土拱稳定分析的三维退化层合曲梁单元

为计算钢管混凝土拱的屈曲荷载，本文在文1]三维退化梁单元的基础上，采用等效数值积分法，构造,出120－20结点三维退化层合曲梁单元，并考虑几何非线性影响，给出用于层合梁或拱线弹性稳定性分析的有限元列式，最后，以绍兴轻纺大桥为工程背景，计算出轻纺大枯钢管混凝土拱面内及面外屈曲的稳定系数。

Finite element analysis on stability of steel pipe-concretearch by the degenerated 3-d laminated curved beam elements

Based on the degenerated 3 dimensional beam element in , we proposed the degenerated 3 dimensional laminated curved beam element concerning geometrical nonlinear, which can be used for analysis on critical load of linear-elastic buckling of steel pipe-concrete arch of ShaoXing QingFang bridge. All the applications and results of them elucidate that the method and the elements presented in the paper are more effectively than much of the others. As a result, the method is a prospective method and is especially well applied to overall analysis in engineering problems.