摘要
本文以渠江特大桥(139+278+139)m矮塔斜拉桥为研究对象,通过建立MIDAS全桥有限元模型,对桥梁结构进行了静力特性分析和施工阶段受力状态研究。重点研究了施工过程监控方法,建立了完整的监测系统和预警指标体系。通过桥面线形和轴线偏位的监测分析、静力计算结果显示、施工阶段索力分析;针对施工过程主梁根部应力突变的现象,提出了分级张拉、对称张拉、临时支撑系统及温度补偿等四种控制突变的方法。研究成果可为同类桥梁的施工控制和监测提供参考。
This paper takes the Qujiang Special Bridge(139+278+139)m low-pylon cable-stayed bridge as the research object.By establishing a MIDAS full-bridge finite element model,a static characteristic analysis and construction-phase stress state study of the bridge structure were conducted.The focus was on the construction process monitoring method,with a complete monitoring system and early warning index system established.Through monitoring and analysis of deck alignment and axis deviation,static calculation results,and construction-phase cable force analysis;in response to the phenomenon of stress abrupt changes at the main girder root during construction,four control methods were proposed:graded tensioning,symmetric tensioning,temporary support systems,and temperature compensation.The research findings can provide a reference for construction control and monitoring of similar bridges.
作者
王荣超
WANG Rong-chao(China Railway 15th Bureau Group Co.,Ltd.Third Engineering Company,Chengdu 641419,China)
出处
《价值工程》
2026年第7期10-12,共3页
Value Engineering
关键词
矮塔斜拉桥
悬臂浇筑
施工监控
施工过程力学性能
low tower cable-stayed bridge
cantilever casting
construction monitoring
mechanical properties during construction process
