高墩大跨曲线刚构桥最大悬臂与成桥阶段稳定性分析

摘要

With high pier large-span curved bridge as the research object,based on Euler stability theory,by a-dopting space finite element method,considering possible adverse load conditions,the structure stability during both maximum cantilevering and completion operation stage has been calculated and analyzed.Through the re-search,it has been found that:the maximum cantilevering state is the most unstable state during construction process;it is the permanent load that controls the stability of the bridge structure,while there is not serious or quite small impact on the bridge stability from live load,wind load or temperature;during cantilever construction stage,significant increasing of transverse displacement appears at the pier top of curved rigid frame bridge,while less impact has been found for the stage of completion operation,especially the impact from wind load;the rela-tions between the characteristic value of stability,pier height and curve radius of high pier large-span curved rig-id frame bridge have been obtained,which could provide references for design,construction and linear monito-ring for similar bridges.%以高墩大跨曲线刚构桥为研究对象，基于欧拉稳定理论，利用空间有限元法，考虑可能的不利荷载工况，对最大悬臂状态和成桥运营阶段的结构稳定性进行计算分析。研究表明：最大悬臂状态是施工过程中最不稳定的状态；对该桥结构稳定性起控制作用的是恒载，活载、风荷载、温度等对桥梁稳定影响不大或者比较小；在悬臂浇筑阶段，曲线刚构桥墩顶的横向位移显著增大，在成桥阶段时影响较小，尤其是风荷载的影响；得出高墩大跨曲线刚构桥墩高、曲率半径与稳定特征值之间的关系，为同类桥梁的设计、施工及线性监控提供参考。