高墩大跨连续刚构桥最大悬臂施工阶段稳定性分析  

Stability Analysis of the Maximum Cantilever of High Pier Large-span Continuous Rigid Frame Bridge in Construction Stage

作　　者：盛伟兵 何润 Sheng Weibing;He Run(Jiangxi Institute of Construction,Nanchang 330200,China;Xiamen Engineering Co.,Ltd.,CCCC First Highway,Xiamen 361021,China)

机构地区：[1]江西建设职业技术学院,江西南昌330200 [2]中交一公局厦门工程有限公司,福建厦门361021

出　　处：《市政技术》2025年第3期125-130,共6页Journal of Municipal Technology

基　　金：江西省教育厅科学技术研究项目:高墩大跨连续刚构桥全过程稳定性分析研究(GJJ2207304)。

摘　　要：为确保高墩连续刚构桥施工期间的安全性,以新站特大桥为例,运用有限元仿真技术对双肢薄壁高墩连续刚构桥在最大悬臂施工阶段的稳定性进行了深入分析。在理想状态和墩顶偏位缺陷状态2种情况下,分别对最大悬臂施工阶段结构的线性、几何非线性和双重非线性的稳定性进行了综合分析。研究结果表明:在理想状态下,仅考虑线性稳定性时,最大悬臂状态的结构稳定系数为13.36;当考虑几何非线性时,该稳定系数降至12.32;进一步考虑双重非线性后,该稳定系数进一步降低至7.83,分别较理想状态下降了7.78%和41.39%。在墩顶偏位缺陷状态下,仅考虑线性稳定性时,最大悬臂状态的结构稳定系数为13.26;考虑几何非线性后,该稳定系数降至11.65;考虑双重非线性时,该稳定系数降至5.31,分别较理想状态下线性稳定系数下降了12.8%和60.25%。由此可见,在进行最大悬臂施工阶段稳定性分析时,非线性稳定性在实际应用中具有更高的价值,且墩顶偏位缺陷对稳定性有一定影响,施工时应严格控制桥墩的垂直度。In order to ensure the safety of high pier continuous rigid frame bridgeduring the construction,the Xinzhan Large Bridge was taken as anexample tomake an in-depth analysis of the stability of double leg thin-walled high pier continuous rigid frame bridges during the maximum cantilever construction stage by finite element simulation technology.Under two conditions of ideal state and pier top offset defect state,the structure stability of linear,geometric nonlinear,and double nonlinear during the maximum cantilever construction stage were comprehensively analyzed.The research results indicate when only linear stability is considered,the maximum structural stability coefficient of the cantilever state is 13.36 under an ideal state;When geometric non-linearity is considered,the stability coefficient drops to 12.32;With further consideration of the dual nonlinearity,the stability coefficient further decreases to 7.83,which is 7.78%and 41.39%lower than the ideal state,respectively.When only linear stability is considered under the pier top displacement defect,the maximum structural stability coefficient of the cantilever state is 13.26;With consideration of geometric nonlinearity,the stability coefficient decreases to 11.65;With consideration of dual nonlinearity,the stability coefficient drops to 5.31,which is 12.8%and 60.25%lower than the ideal linear stability coefficient,respectively.It can be seen that nonlinear stability has higher value in practical applications during the stability analysis of the maximum cantilever construction stage.The deviation defect of the pier top has a certain impact on stability so that the verticality of the pier should be strictly controlled during construction.

关 键 词：稳定性 双肢薄壁高墩 连续刚构桥 悬臂施工 非线性分析 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]