无加劲纵梁吊杆拱桥整体性能提升加固方法研究  

Research on the Reinforcement Method for Improving the Overall Performance of the Suspension Arch Bridge without Longitudinal Stiffened Beams

作　　者：贺韵 邱鹏 HE Yun;QIU Peng(China Merchants Chongqing Communications Technology Research&Design Institute Co.,Ltd.,Chongqing 400067)

机构地区：[1]招商局重庆交通科研设计院有限公司,重庆400067

出　　处：《公路交通技术》2024年第6期95-102,113,共9页Technology of Highway and Transport

摘　　要：为解决无加劲纵梁吊杆拱桥吊杆断裂致使上部桥面板存在落梁风险的问题,提出对该类拱桥增加钢纵梁以增加桥梁整体性能的加固方案,并采用有限元数值模拟分析了吊杆拱桥横梁增加钢纵梁连接后,增加通长、荷载适配的钢纵梁断索前后的变化规律,且对新提出的新增钢纵梁设计方案进行了分析验证。结果表明:1)增加的通长加劲钢纵梁在正常使用与断索情况下均满足设计强度要求;2)通过将人行道改造为钢结构方式,荷载适配与原设计的荷载相当,保证改造后拱圈受力状态基本不变;3)无加劲纵梁吊杆拱桥整体性能提升方案可行,可供类似桥梁整体性能提升参考。In order to solve the problem that the suspension rod of the non-stiffened longitudinal beam boom arch bridge has the risk of falling beams on the upper bridge deck,a reinforcement scheme that steel longitudinal beams was added to the non-stiffened longitudinal beam boom arch bridge to increase the overall performance was put forward.Using the finite element numerical simulation method,the variation law of the steel longitudinal beam before and after the broken cable with the increase of throughput length and load adaptation is analyzed,after adding the steel longitudinal beam connection to the boom beam.The newly proposed design scheme of additional steel longitudinal beams is analyzed and verified.The results show that:1)The increased through-length stiffened steel longitudinal beams meet the design strength requirements under normal use and broken cables;2)By transforming the sidewalk into a steel structure,the load adaptation is comparable to the original design load,which ensures that the force state of the arch ring is basically unchanged after the transformation;3)The overall performance enhancement program of the suspension arch bridge without stiffened longitudinal beams is feasible,which can be used as a reference for similar bridges to enhance their overall performance.

关 键 词：公路桥梁 吊杆拱桥加固 数值计算 吊杆横梁 钢纵梁 吊索更换 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]