基于体系转换法上承式拱桥结构加固设计研究  

Reinforcement Design of Deck Arch Bridge Based on the System Transformation Method

作　　者：覃霞 马增华 李祎嘉 傅健 谢肖礼[2] QIN Xia;MA Zenghua;LI Yijia;FU Jian;XIE Xiaoli(Nanning Vocational and Technology University,Nanning 530008,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China)

机构地区：[1]南宁职业技术大学,广西南宁530008 [2]广西大学土木建筑工程学院,广西南宁530004

出　　处：《国防交通工程与技术》2025年第2期11-16,共6页Traffic Engineering and Technology for National Defence

基　　金：2023年度广西高校中青年教师科研基础能力提升项目(2023KY1056)。

摘　　要：为解决部分上承式拱桥承载能力不足的问题,基于体系转换法提出加肋桁架拱桥加固方法,即拆除原上承式拱桥钢筋混凝土拱上建筑,在拱圈上增设刚性斜杆及钢主梁,形成以三角网腹杆连接主梁及原拱圈的加肋桁架结构,将由原拱圈为主要承重构件体系转换为加肋桁架及拱圈共同受力体系,提高结构的整体性及承载能力。以一座跨径为46 m的上承式拱桥为例进行加固,通过网格数值模拟分析加固效果。结果表明:加固后拱圈在活载作用下下挠峰值向跨中内移,体系转换作用明显,结构刚度提高16.9%,拱圈最大应力较原桥减小了26.4%,结构固有频率提高37.6%。加固优化后的上承式拱桥能够满足公路-Ⅰ级荷载要求。To address the insufficient bearing capacity of some deck arch bridges,this study proposes a reinforcement method based on the system transformation method.The method involves removing the original reinforced concrete superstructure of the deck arch bridge and adding rigid diagonal members and steel main girders to the arch ring.This modification forms a ribbed truss structure,in which the main girder and the original arch ring are connected by triangular web members.Through system transformation,the primary load-bearing mechanism shifts from the original arch ring alone to a combined ribbed truss-arch ring system,thereby enhancing structural integrity and load-bearing capacity.A 46-meter-span deck arch bridge was selected as a case study for reinforcement design,and the effectiveness of the reinforcement was analyzed through finite element numerical simulations.The results indicate that after reinforcement,the peak deflection of the arch ring under live load shifts inward toward the mid-span,demonstrating a significant system transformation effect.The structural stiffness increased by 16.9%,the maximum stress of the arch ring reduced by 26.4%,and the natural frequency of the structure increased by 37.6%.The optimized reinforced deck arch bridge meets the requirements of highway class-Ⅰloading standards.

关 键 词：上承式拱桥 结构加固 加肋桁架 体系转换法 网格法数值模拟 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]