带拉杆及横撑的双肋钢管混凝土拱稳定分析的有限单元法

文中在２０结点三维块体等参元与１６结点相对位移板壳元的基础上，引入梁的基本假定，采用等效数值积分法，构造出１２￣２０结点三维退化平面和柱面层合曲梁单元，给出用于梁或拱线弹性稳定性分析的有限元列式。并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 ofSteel Pipe - Concrete Arches with LevelTorsion Bars and Traverse Supports

Based on 3 - D iso - parameter element and the plate shell element of relative displacement , and combining with beam assume 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 pipe - concrete arch of ShaoXing QingFang bridge. All the ap-plicatitions 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.