钢筋混凝土桁架拱桥承载力加固的力学性能对比分析  

Comparative Analysis of Mechanical Properties of Reinforced Concrete Truss Arch Bridge Strengthened by Bearing Capacity

作　　者：王勤征 张华刚[1,2] 陈红鸟 马克俭[1,2] 魏艳辉 刘宇[3] WANG Qinzheng;ZHANG Huagang;CHEN Hongniao;MA Kejian;WEI Yanhui;LIU Yu(Space Structures Research Center,Guizhou University,Guiyang 550025,China;Key Laboratory of StructuralEngineering of Guizhou Province,Guiyang 550025,China;Guizhou Transportation Planning,Survey,Design and Research Institute Co.,Ltd.,Guiyang 550001,China)

机构地区：[1]贵州大学空间结构研究中心,贵州贵阳550025 [2]贵州省结构工程重点实验室,贵州贵阳550025 [3]贵州省交通规划勘察设计研究院股份有限公司,贵州贵阳550001

出　　处：《贵州大学学报（自然科学版）》2021年第5期74-80,共7页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金资助项目(51568012)。

摘　　要：由于设计标准的原因,早期的钢筋混凝土桁架拱桥不满足现代交通需求时,需做承载力加固处理。采用粘贴钢板、全部截面箱型转换和关键截面箱型转换等3种加固方法,通过Midas/Civil和有限元分析(finite element analysis,FEA)软件建立某桁架拱桥加固前后的计算模型,对比分析其在静力、动力和稳定性等方面的加固效果。结果表明:全部截面箱型转换加固在改善结构受力,降低结构下挠变形,提高刚度及稳定性方面优势明显;粘贴钢板加固在提高面外刚度和稳定性方面表现不足;关键截面箱型转换加固由于其结构本身缺陷,加固效果不理想。Because of the design standard,when the early reinforced concrete truss arch bridge can't meet the modern traffic demand,it needs to be strengthened by bearing capacity.In this paper,a truss arch bridge model and three reinforcement models by different methods,including pasting steel plate,box transformation of all sections and box transformation of key sections,are established by Midas/Civil and FEA(finite element analysis software)to analyse the reinforcement effects by comparing the static,dynamic and stability of the four models.The results show that the box transfer reinforcement of all sections has obvious advantages in improving the structural stress,reducing the structural deflection,improving the stiffness and stability,while the pasting steel plate reinforcement has insufficient performance in improving the stiffness and stability outside the plane,and the box transfer reinforcement of key sections has poor reinforcement effect due to the structural defects.

关 键 词：桁架拱桥 承载力加固 有限元 力学性能 截面箱型转换 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]