钢筋混凝土拱桥加固施工次序方案及效果评价  

Schemes and Effect Evaluation of Retrofit Construction Sequences for Reinforced Concrete Arch Bridge

作　　者：徐略勤[1,2] 杨忠友 周水兴[1,2] 岳克锋 沈正璇 XU Lueqin;YANG Zhongyou;ZHOU Shuixing;YUE Kefeng;SHEN Zhengxuan(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]重庆交通大学山区桥梁及隧道工程国家重点实验室,重庆400074

出　　处：《重庆交通大学学报（自然科学版）》2024年第6期8-15,共8页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：重庆英才创新领军人才计划项目(cstc2022ycjh-bgzxm0133);重庆市教委科技研究计划项目(KJQN201900737)。

摘　　要：为研究钢筋混凝土拱桥最优的加固施工次序,以一座在役4跨箱形拱桥的加固方案为背景,设计了3组针对性的加固方案,并对不同拆除加固施工次序下的主拱圈力学性能进行了分析;采用恒载应力变化率(αD)和荷载效应变化率(αN)评价了施工中拱圈的应力变化规律及加固后原拱圈的荷载效应。研究结果表明:拱上结构的拆建次序对加固后主拱圈的力学性能影响较小,但对加固过程中主拱圈的受力状态影响较大;拱顶对称拆除时αD<0,结构处于“卸载”状态,有利于拱桥施工中的受力;αN随着拱上结构恒载减小而增大,且增速减缓,故加固层材料利用率也随拱上结构恒载减小而增大,且增幅变缓;αN越大,则加固效果越好。In order to study the optimal reinforcement construction sequence of reinforced concrete arch bridge,three sets of targeted reinforcement schemes were designed against the background of the reinforcement scheme design of a four-span box-shaped arch bridge in service,and the mechanical properties of the main arch ring under different demolition and reinforcement construction sequences were analyzed.The stress change law of the arch ring during construction and the load effect of the original arch ring after reinforcement were evaluated by using the change rate of dead-load stress(αD)and the change rate of load effect(αN).The research results show that the demolition and retrofit sequence of the arch building has little influence on the mechanical properties of the main arch ring after reinforcement,but it has a great influence on the stress state of the main arch ring during the reinforcement process.When the arch vault is symmetrically demolishedαD<0,the structure is in the state of"unloaded",which is conducive to the stress of the arch bridge in the construction process.The change rate of load effect(αN)increases with the decrease of the dead load of the arch structure and the growth rate slows down.Therefore,the utilization rate of the reinforcement layer material also increases with the decrease of the dead load of the arch structure,and the growth rate slows down.The larger theαN,the better the reinforcement effect.

关 键 词：桥梁工程 钢筋混凝土拱桥 恒载应力变化率 荷载效应变化率 加固施工次序方案 效果评价 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]