【摘要】 对一座施工到最大双悬臂时的预应力混凝土斜拉桥进行稳定性有限元分析,该桥的主梁为双主肋式,通过选取不同的主梁有限元模型进行特征值屈曲计算,讨论了这些有限元模型对于主梁刚度的模拟的特点,指出了传统单主梁和双主梁模型的缺点。针对双主梁模型,提出了一种采用等效刚度模拟横向连接的方法,可简化计算。更多还原

【Abstract】 The stability of a prestressed concrete cable-stayed bridge was analyzed with FEM while the construction of the longest double cantilever finished.The girder of this bridge was double main rib.Different kinds of finite element model of the girder were selected in the eigenvalue buckling analysis.According to the results,the characteristics of these finite element models in simulation of the girder rigidity are discussed.The disadvantages of the traditional single-girder and double-girder models are pointed out.The method of using equivalent rigidity to simulate the lateral connection of double-girder model is also proposed.It is convenient.更多还原