四线铁路圆端形薄壁空心桥墩的弹塑性稳定分析

以四线圆端形薄壁空心墩为研究对象,利用通用有限元程序ANSYS进行非线性屈曲分析,探讨了结构原始缺陷及混凝土材料非线性对四线超宽圆端形薄壁空心墩稳定性的影响,将有限元弹塑性稳定分析得出的极限临界荷载与按铁路桥梁设计规范中计算桥墩纵向整体稳定性的屈曲临界荷载公式结果进行了分析比较,并对四线铁路圆端形薄壁空心墩的稳定性能作出了评价.

Analysis of Elastoplastic Stability of Hollow Piers with Round End and Thin Wall for Four-lane Railway

Hollow piers with round end and thin wall for four-lane railway is taken as an example to make nonlinear buckling analysis and to probe the influence of structure initial defect and concrete material nonlinearity on the super-wide four-lane hollow pier with round end and thin wall by using the general finite element program ANSYS.The limit critical load of finite element elastoplastic stability is compared with the result of critical buckling load formulae by the design specification of railway bridge to compute the longitudinal stability of pier,and the stability of the hollow pier with round end and thin wall for four-lane railway is evaluated.