悬浇过程应力应变监控技术在大跨度连续梁中的应用  

Application of Stress And Strain Monitoring Technology in Large Span Continuous Beams During Suspension Pouring

作　　者：张永辉 ZHANG Yonghui(Xinjiang Highway and Bridge Testing Center Co.,Ltd.,Urumqi,Xinjiang 830000,China)

机构地区：[1]新疆公路桥梁试验检测中心有限责任公司,新疆乌鲁木齐830000

出　　处：《黑龙江交通科技》2025年第4期63-66,71,共5页Communications Science and Technology Heilongjiang

摘　　要：为探究大跨度连续梁桥悬臂浇筑施工过程及成桥后,桥梁结构的竖向位移和内部应力的变化情况,以西水东引引干渠大桥悬臂施工法中的桥梁监控技术为背景,结合数值模拟和工程监测对比分析,研究结果表明:施工阶段主梁竖向位移随悬挑长度增加而增大,最大值出现在浇筑9^(#)块后,竖向位移最大值为15.5 mm,成桥后最大竖向位移为13.8 mm;成桥后混凝土收缩徐变将引起结构预拱度增加,10年徐变收缩预拱度将增加29.6%;施工过程中主梁最大拉应力为1.31 MPa,最大压应力为11.58 MPa,分别出现在0^(#)墩顶和1^(#)块下边缘,实际检测数据显示,大桥最大竖向位移为16.2 mm,峰值压应力为10.88 MPa,与数值模拟结果相差分别相差4.5%和6%,数值模拟和实际监测结果具有一致性,且均处于安全可控范围。In order to explore the changes of vertical displacement and internal stress of large-span continuous beam bridge during cantilever pouring construction and after completion of the bridge,the bridge monitoring technology in the cantilever construction method of the Yinganqu Bridge is used as the background,combined with numerical simulation and engineering monitoring comparative analysis,the research results show that:During the construction phase,the vertical displacement of the main beam increases with the increase of the cantilever length.The maximum vertical displacement is 15.5 mm after the pouring of 9^(#)block and 13.8mm after the completion of the bridge.The shrinkage and creep of concrete will lead to the increase of structural pre-camber,and the 10-years creep and shrinkage pre-camber will increase by 29.6%.In the construction process,the maximum tensile stress of the main beam is 1.31 MPa and the maximum compressive stress is 11.58 MPa,which appear respectively at the top of pier 0 and the lower edge of block 1^(#).The actual test data show that the maximum vertical displacement of the bridge is 16.2 mm and the peak compressive stress is 10.88 MPa,which is 4.5%and 6%different from the numerical simulation results,respectively.The results of numerical simulation and actual monitoring are consistent,and both are in a safe and controllable range.

关 键 词：悬臂施工 监控技术 连续梁 

分 类 号：U443[建筑科学—桥梁与隧道工程]