摘要
大跨变高度连续梁在施工阶段受到混凝土收缩徐变的影响,导致桥梁线形随时间推移而变化,同时线形变化也引起结构应力变化,所以在施工过程中必须加以重视和控制。以老山高架桥主桥为工程背景,采用桥梁有限元仿真技术,模拟大跨变高度连续梁桥全部施工流程,对不同施工阶段连续梁主梁线形及关键截面应力开展分析,研究施工过程中收缩徐变对桥梁建成后线形和应力的影响,根据研究结果优化了施工控制方案。通过对理论值与实测值对比分析,表明施工过程中全桥线形和应力控制良好,施工过程结构安全。
During the construction of long-span variable height continuous beams,the effects of concrete shrinkage and creep induce time-dependent deformations in the bridge′s geometric alignment,which further trigger structural stress redistribution.These phenomena necessitate rigorous monitoring and control throughout construction.This study takes the main span of Laoshan Bridge as the engineering case,and uses the bridge finite element simulation technology to simulate the whole construction process of a long-span variable height continuous beam bridge.The geometric alignment of the main girder and the stresses at critical cross-sections of continuous beam at different construction stages are analyzed,and the influence of shrinkage and creep during construction on the alignment and stress of the bridge after completion is studied.According to the research results,the construction control scheme is optimized.Comparative analysis between theoretical predictions and field measurements demonstrates that the global geometric alignment and stress distribution are effectively controlled,ensuring structural safety during construction.
作者
刘永
LIU Yong(China Railway 25th Bureau Group 2nd Engineering Co.Ltd.,Nanjing Jiangsu 210046,China)
出处
《铁道建筑技术》
2025年第9期152-155,164,共5页
Railway Construction Technology
基金
中铁二十五局集团有限公司科技开发计划项目(2020-C17)。
关键词
收缩徐变
变高度连续梁
线形
应力
shrinkage and creep
variable height continuous beams
alignment
stress
