山区薄壁高墩大跨连续刚构桥施工过程中稳定性研究  

Study on stability of thin-walled and long-span continuous rigid frame bridge during construction in mountainous area

作　　者：谌蛟 许鹏 袁胜涛 聂良鹏 保优 陈玉山 吴平伟 SHEN Jiao;XU Peng;YUAN Shengtao;NIE Liangpeng;BAO You;CHEN Yushan;WU Pingwei(Yunnan Tongqu Engineering Testing Co.,Ltd.,Kunming Yunnan 650041,China)

机构地区：[1]云南通衢工程检测有限公司,云南昆明650041

出　　处：《工业安全与环保》2024年第10期19-24,30,共7页Industrial Safety and Environmental Protection

基　　金：云南省交通运输厅科技项目(云交科教便[2020]91号)。

摘　　要：连续刚构桥是重丘山岭的复杂地带使用最为广泛的结构形式之一,其施工阶段的结构稳定性及安全性不容忽视。以墩高为138m连续刚构桥作为研究对象,利用桥梁专用软件MidasCivil建立该桥的空间有限元模型,模拟计算该桥薄壁墩最高裸墩、最大悬臂阶段和成桥3种状态的稳定性,对理论公式与有限元模型计算结果进行对比分析。结果表明,每个施工阶段在各工况下的稳定性满足要求,最大悬臂状态为最不利工况,其风荷载及温度荷载对桥墩稳定性影响不大,结构自重对最高裸墩稳定性影响较大,在成桥状态下整体升降温对桥梁结构稳定性影响较小;通过局部单元建立平衡方程进行理论推导,并与有限元分析的结果进行对比分析,其结果较吻合。Continuous rigid frame bridge is one of the most widely used structures in the complex area of heavy hills and mountains,and the structural stability and safety of the construction phase can not be ignored.Taking a continuous rigid frame bridge with 138 m pier height as research object.The spatial finite element model of the bridge was estab lished by using the bridge special software Midas Civil,and the stability of the thin-wall pier at the highest bare pier,the maximum cantilever stage and the complete bridge was calculated by simulation.The results of theoretical formula and finite element model were compared and analyzed,which showed that the stability of each construction stage met the requirements of the stability under various conditions,and the largest cantilever status was the most unfavorable condition.Its work conditions and temperature lotus loads had little effect on the stability of the pier,and structural self-weight had a great impact on the stability of the highest naked pier,while the overall rise and cooling under the bridge state had little impact on the stability of the bridge structure.A balanced equation was established through local units for theoretical derivation,and its results were compared with those of finite element analysis,in addition,the re sults of the two methods were compatible.

关 键 词：薄壁高墩 连续刚构桥 施工过程 有限元 稳定性分析 

分 类 号：U445[建筑科学—桥梁与隧道工程] U448.23[交通运输工程—道路与铁道工程]