混凝土桁架拱桥荷载试验与承载力评价  

Load Test and Bearing Capacity Evaluation of Truss Arch Bridges

作　　者：宋洪雨 苏春杰 蔡保硕 王树昆 Song Hongyu;Su Chunjie;Cai Baoshuo;Wang Shukun(Beijing General Municipal Engineering Design&Research Institute Co.,Ltd.,100082,China;Beijing Engineering Research Center of Urban Bridge Security,100082,China;Beijing Municipal Bridge Maintenance Management Group Co.,Ltd.,100097,China;Beijing Engineering Pipeline and Bridge Component Quality Supervision and Inspection Station,100032,China)

机构地区：[1]北京市市政工程设计研究总院有限公司,100082 [2]北京市城市桥梁安全保障工程技术研究中心,100082 [3]北京市政路桥管理养护集团有限公司,100097 [4]北京市工程管道及桥梁构件质量监督检验站,100032

出　　处：《特种结构》2024年第2期51-57,64,共8页Special Structures

摘　　要：钢筋混凝土桁架拱桥以其用料省、自重小、结构纤细美观等特点曾在我国大量修建,后期服役过程中在重载及环境因素的共同作用下出现大量病害影响结构使用安全及耐久性。本文以某钢筋混凝土桁架拱桥为例,详细介绍了该桥结构状态检测评估的内容以及桥梁荷载试验的内容、方法、测点布置。通过荷载试验与有限元分析相结合的方法较为全面地评价了既有桁架拱桥的承载能力,结果显示拱桥荷载试验校验系数大于1.0,最大相对残余变形为18%,桥梁实际受力状态较原设计存在明显劣化。最终结合结构病害、有限元计算及拱轴线测量结果给出了针对性的加固方案,为此类桥梁的结构状态评定及维修加固设计提供借鉴作用。Reinforced concrete truss arch bridges had been extensively constructed in China due to their advantages such as low material consumption,light weight,slim and beautiful structure.In the later service process of these bridges,many diseases appeared under the combined effects of heavy loads and environmental factors,which affected the safety and durability of the structures.Taking a reinforced concrete truss arch bridge as an example,in this paper,the content of detection and evaluation of the bridge state,and the con-tent,method and measuring point arrangement of the load test of this kind of bridge were introduced in detail.Based on load test and finite element analysis,the bearing capacity of the existing truss arch bridge was com-prehensively evaluated.The results showed that the check coefficient of load test of the arch bridge was more than 1.0,and the maximum relative residual deformation was 18%,which meant that the actual stress state of the bridge was obviously worse than that of the original design bridge.Finally,combined with the structural diseases,finite element calculations and arch axis measured results,a targeted reinforcement scheme was pro-posed,which can be referenced for the structural state assessment,maintenance and reinforcement design of such bridges.

关 键 词：桁架拱桥 维修加固 荷载试验 承载力评价 

分 类 号：U448.224[建筑科学—桥梁与隧道工程] U441.2[交通运输工程—道路与铁道工程]