SAFETY ANALYSIS OF HOLLOW PLATE GIRDER BRIDGE BASED ON ROUTINE DETECTION INDEXES

Hinge joints, cracks, and permanent deformation have a significant influence on the safety of the hollow plate girder bridges. The effects of these factors on the safety performance of hollow plate girder bridges with different spans were analysed with the help of the MIDAS/finite element analysis (FEA) numerical simulation platform. First, a multilevel damage finite element model of the different damage forms of hollow plate girder bridges with a typical span was established, and the influence of the joint damage on the safety performance of the hollow plate girder bridges was analysed. Second, taking the height of the hinge joints as the research parameter, nonlinear FEA was carried out under monotonic loading and repeated loading, and the influence of different crack states on the internal force and deformation of the hollow plate girder bridges was analysed. Finally, the simplified calculation formula of the permanent deformation limit of hollow plate girder bridges was established based on the premise of the ultimate strain of the concrete in the compressive zone of the main girder. The research results can provide a reference for the safety evaluation of hollow plate girder bridges.