梁桥在特种车辆荷载下结构安全评估

Structural safety assessment of beam bridge under special vehicle load

以某跨度184.9 m的预应力混凝土分体箱梁桥为研究背景,在特种车辆荷载的作用下主要对现有桥梁结构安全性进行评估分析。结合工程实践,采用有限元软件Midas/civil 2018,分析了特种车辆荷载通行时,对桥梁承载力的影响。选择桥梁结构中主要的力学参数:正截面承载力、斜截面承载力、变形和应力进行了系列验算。研究结果表明,控制性截面的各种承载力可以满足特种车辆荷载通行要求,变形和应力符合要求。

The prestressed concrete split box girder bridge with a span of 184.9 m as the research background,the structural safety of the existing bridge is evaluated and analyzed under the action of special vehicle load.Combined with engineering practice,the bearing capacity of existing bridges under special vehicle loads is analyzed by using finite element software Midas/civil 2018.A series of checking calculations are carried out on the normal section bearing capacity,oblique section bearing capacity,deformation and stress of the controlled section of the bridge.The results show that all kinds of bearing capacity of controlled section can meet the requirements of special vehicle load,and the deformation and stress meet the requirements.