运营状态下特大悬索桥无损检测及承载能力评估  

Nondestructive Testing and Carrying Capacity Assessment of Oversize Suspension Bridge in Operation Condition

作　　者：王宇新 WANG Yuxin(CCCC Second Highway Consultants Co., Ltd., Wuhan 430052, China)

机构地区：[1]中交第二公路勘察设计研究院有限公司,武汉430052

出　　处：《交通科技》2021年第3期16-20,共5页Transportation Science & Technology

摘　　要：为评价特大悬索桥在运营状态下的承载能力状态,选择某长度为1108 m的双铰钢桁梁悬索桥作为研究对象。通过现场无损检测的方法确定桥梁结构的各分项检算系数,同时,利用有限元软件构建桥梁数值模型,考虑不同荷载工况下的桥梁承载能力状态。结果表明,桥墩结构强度、变形和裂缝宽度符合正常使用极限状态要求;加劲梁承载能力经过系列验算后,均能满足承载能力使用要求;对比悬索桥重要构件吊索在损伤前后的索力发现,计算索力值小于修正后的应力限值,说明吊索受力处于安全状态。总体而言,考虑桥梁的折减系数后,桥梁实际承载能力整体有所削弱,但仍能满足原设计使用要求。In order to evaluate the bearing capacity of the extra-large suspension bridge in operation,a double-hinged steel truss suspension bridge with a length of 1108 m was selected as the research object.The checking coefficient of each item of the bridge structure was determined by the method of on-site non-destructive testing,at the same time,the numerical model of the bridge was constructed by using the finite element software,and the bearing capacity of the bridge under different load conditions was considered.The results show that the structural strength,deformation and crack width of bridge piers meet the requirements of normal service limit state.Moreover,the checking calculations illuminate that the load-bearing capacity of the stiffening beam can meet the requirements of the load-bearing capacity;comparing the cable force of the important component of suspension bridge before and after the damage,it is found that the calculated cable force is less than the modified stress limit,indicating that the force of the sling is in a safe state.Overall,after considering the reduction coefficient of the bridge construction,the actual bearing capacity of the bridge is weakened as a whole,but it can still meet the requirements of the original design.

关 键 词：悬索桥 有限元 承载能力 损伤模拟 

分 类 号：U446[建筑科学—桥梁与隧道工程]