连续刚构桥墩抗裂实体有限元分析

Finite Element Analysis of Anti-crack Entity of Continuous Rigid Frame Bridge Pier

对多跨连续刚构桥墩做了线性和非线性有限元分析,比较分析了桥墩应力和裂缝大小在梁单元与实体模型下的差异。结果表明,梁单元模型桥墩的拉应力与裂缝均比实体模型要小,并且梁单元模型桥墩两肢V腿合并处应力与裂缝大小严重失真;收缩徐变、汽车荷载和整体降温是引起桥墩受拉的主要原因;中跨合拢前互推两侧梁体,可以有效改善桥墩受力。

The linear and nonlinear finite element analysis of a multi-span continuous rigid frame bridge pier is made. The difference of pier stress and crack size are compared and analyzed in the beam element and entity model. The result shows that the tensile stress and crack of bridge pier in beam element model are smaller than the entity model, and the stress and crack size at two V-type combined supports of pier in beam model are seriously distorted. The shrinkage and creep, vehicle load and overall cooling are the main factors to cause the tension of bridge pier. To push each other on the both sides of beam before the mid-span closure can effectively improve the stress of bridge pier.