钢筋混凝土拱桥主拱圈加固方式及效果研究  

Study on Strengthening Method and its Effects on Main Arch Ring in Reinforced Concrete Arch Bridge

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

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

出　　处：《沈阳建筑大学学报（自然科学版）》2024年第2期250-258,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51978113)。

摘　　要：目的 寻求钢筋混凝土拱桥主拱圈最佳加固方式,以改善加固效果,给同类危旧拱桥加固提供参考。方法 基于某实际加固桥例提出3种不同卸载方式的加固改造方案,采用Midas civil软件建立有限元模型,分析不同加固方式的影响规律;对原拱圈初始应力水平、施工阶段内力、成桥状态下应力、内力及挠度进行分析;利用加固层最大应力比、荷载置换率和挠度变化率对加固效果进行评价。结果 方案三的加固层最大应力比分别比方案一、二大45.12%与52.74%,荷载置换效果最显著,最大值达3.82,挠度变化率最大。结论 选择拱上建筑拆除得越多的方式进行加固,加固效果越好;对钢筋混凝土拱桥进行加固时,应基于加固方式制定加固施工方案,同时需考虑施工工期与加固成本。In order to find the best strengthening method for the main arch ring of reinforced concrete arch bridge to improve the strengthening effect,and to provide a reference for the strengthening of similar dilapidated arch bridges.Based on an actual strengthening example,the construction scheme corresponding to three strengthening methods is proposed,the finite element model was established by Midas civil,the influence of different strengthening methods is analyzed theoretically,and the initial stress level,internal force in the construction stage,stress in the bridge state,internal force and deflection of the original arch ring were analyzed.The maximum stress ratio,load displacement rate and deflection change rate of the strengthening layer were used to evaluate the strengthening effect.The results show:The maximum stress ratio of the scheme 3 is 45.12%and 52.74%larger than those of schemes 1 and 2 respectively.The load replacement rate of scheme 3 is the largest among the three schemes with the largest value being 3.82.Also,the deflection change rate of scheme 3 is the largest.Choose the way to strength the arch building with more spandrel structures,the better the strengthening effect.When the reinforced concrete arch bridge is strengthening,the construction strengthening scheme should be formulated based on the strengthening mode;At the same time,the construction plan should consider the construction period and strengthening cost.

关 键 词：钢筋混凝土拱桥 增大截面法 加固方式 加固效果 加固指标 卸载 

分 类 号：TU375.5[建筑科学—结构工程] U445[建筑科学—桥梁与隧道工程]