雷堡坳大桥高墩稳定性分析

根据有限元计算方法,对雷堡坳大桥最大悬臂施工阶段的各种工况进行稳定特征值分析。结果表明,结构自重、施工临时荷载、挂篮等竖向荷载对结构稳定性起主导作用,尤其挂篮突然脱落、上部结构悬浇箱梁一端滞后施工一个梁段对桥梁结构的稳定性影响较大,增设横系梁可以提高桥墩的稳定性。

Stability Analysis of LeiBaoAo Bridge With High Pier

Based on the finite element calculation method,the paper analyzed stability eigenvalue of the Lei Bao Ao bridge,which is in maximum cantilever construction stage under various working conditions.The results shows that the dead weight of structure,temporary load,the vertical hanging basket load plays the dominant role on the structure stability,especially that the basket breaks off in a sudden,the upper structure suspending cast box beam lagged behind the construction of a beam segment makes a great influence on the stability of bridge structure,while adding the cross beam can improve the stability of bridge pier.