基于体外预应力加固法连续刚构桥加固效果分析  

Analysis of Reinforcement Effect of Continuous Rigid Frame BridgeBased on External Prestressing Method

作　　者：余凯渊 马壮 张长青 袁飞龙 YU Kaiyuan;MA Zhuang;ZHANG Changqing;YUAN Feilong(Ningxia Hui Autonomous Region Road Transportation Affairs Center,Yinchuan,Ningxia 750000,China;Zhongzi Highway Maintenance and Testing Technology Co.,Ltd.,Beijing 100097,China)

机构地区：[1]宁夏回族自治区道路运输事务中心,宁夏银川750000 [2]中咨公路养护检测技术有限公司,北京100097

出　　处：《黑龙江交通科技》2024年第12期83-89,共7页Communications Science and Technology Heilongjiang

摘　　要：以连续刚构公路桥梁为背景,通过数值模拟计算与现场实测,分析荷载作用下,主梁应力变化特征,第2跨主梁跨中截面、1^(#)墩墩顶梁截面,以及第2跨主梁1/4长度处截面受力特征,并将实测值与模拟值进行对比分析。结果表明:(1)在荷载作用下,桥梁第2跨主梁实测挠度值始终小于模拟值,跨中截面的应变校验系数和挠度校验系数均<1,加固后的桥梁结构的强度满足工程要求;(2)在荷载作用下,1^(#)墩墩顶梁截面的应变校验系数<1,相对残余应变小于规范规定限值0.2,满足规范要求;(3)在荷载作用下,第2跨主梁1/4长度处截面的实测值始终小于模拟值,应变校验系数和挠度校验系数均<1,加固后桥梁结构的强度满足工程要求;(4)在实际桥梁加固工程中,采用体外预应力加固技术对桥梁进行加固,可促使裂缝闭合,减小桥梁结构的挠度。Taking a continuous rigid frame highway bridge as the background,through numerical simulation calculation and field measurement,the stress variation characteristics of the main beam under load,the mid-span section of the second span main beam,the section of the top pier of the 1^(#)pier beam,and the section stress characteristics of the second span main beam at 1/4 length are analyzed,and the measured values are compared with the simulated values.The results show that:(1)Under load,the measured deflection value of the second span main beam is always less than the simulated value,and the strain check coefficient and deflection check coefficient of the mid-span section are both less than 1.The strength of the reinforced bridge structure meets the engineering requirements;(2)Under the action of load,the strain check coefficient of the pier top beam section of 1^(#)pier is less than 1,and the relative residual strain is less than the limit value 0.2 specified in the code,which meets the code requirements;(3)Under load,the measured value of the section at 1/4 length of the second span main beam is always smaller than the simulated value,and the strain check coefficient and deflection check coefficient are both less than 1,indicating that the strength of the reinforced bridge structure meets the engineering requirements;(4)In the actual bridge strengthening project,the use of external preforce reinforcement technology to strengthen the bridge can promote the crack closure and reduce the deflection of the bridge structure.

关 键 词：公路桥梁 体外预应力加固 应变 挠度 

分 类 号：U445.6[建筑科学—桥梁与隧道工程]