特大跨连续刚构桥下挠成因分析及处治应用  

Analysis on the Causes of Deflection under Ultra Long Span Continuous Rigid Frame Bridges and Application of Treatment Measures

作　　者：张澎 耍荆荆 ZHANG Peng;SHUA Jing-jing(Yangzhou Polytechnic Institute,Yangzhou 225000,China;CCCC Highway Consultants Co.Ltd.,Beijing 100010,China)

机构地区：[1]扬州工业职业技术学院,扬州市225000 [2]中交公路规划设计院有限公司,北京市100010

出　　处：《公路》2025年第3期98-103,共6页Highway

摘　　要：依托某主跨225 m的六跨连续刚构桥,通过实桥检测及调查数据,对桥梁的跨中下挠病害进行原因分析。利用有限元软件分析了本桥重点因素对下挠和应力的影响,在此基础上采用了体外预应力措施对下挠进行处治。理论计算表明,体外预应力能减少下挠值并对桥梁应力起到改善作用。加固中及加固后下挠情况的监测结果,验证了体外预应力对特大跨连续刚构桥跨中下挠速度和下挠量的改善作用。In the paper,relying on a 6-span continuous rigid frame bridge with a main span of 225 m,the causes of mid span deflection defects of the bridge are analyzed through real bridge testing and investigation data.The influence of key factors on deflection and stress of this bridge are analyze d by using finite element software.Based on this,external prestressing measures are adopted to tre at deflection.Theoretical calculations show that external prestressing can reduce deflection values and improve bridge stress.The monitoring results of deflection during and after reinforcement have verified the improvement effect of external prestressing on deflection velocity and deflection amount of longbridge engineering;extra large span continuous rigid frame bridge;deflection treatment;prestressing loss;external prestressingspan continuous rigid frame bridges.

关 键 词：桥梁工程 特大跨连续刚构桥 下挠处治 预应力损失 体外预应力 

分 类 号：U445.71[建筑科学—桥梁与隧道工程]