钢管混凝土拱稳定分析的有限元法

在 2 0结点三维块体等参元及 1 6结点相对位移板壳元 1 ] 的基础上、引入梁的基本假定 ,采用等效数值积分法 ,构造出 1 2 - 2 0结点三维退化平面和柱面层合曲梁单元 ,同时给出用于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 ,计算出轻纺大桥钢管混凝土拱面内屈曲及面外侧倾屈曲的临界荷载。

The Finite Element Analysis on Stability of Steel Pipe-Concrete Arch

Based on 3 D iso parameter element and the plate shell element of relative displacement (Xu Xing 1993), and combining with beam assumption and layer integration, 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 pipeconcrete arch of ShaoXing QingFang bridge. All the applicatitions and results of them elucidate that the method and the elements presented in the paper are more effective 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.