Study on Asymmetric Closure Scheme of Rigid Frame-Continuous Beam Composite System Bridge

Abstract The rigid frame-continuous beam composite system bridge has many spans, and the pier layout is different, and the demolition of temporary anchorage of pier and beam needs to undergo system transformation. Therefore, different closure sequence and the demolition time of temporary anchorage of pier and beam will have certain influence on the internal force and alignment of the main girder after completion of the bridge. Based on the practical engineering of the rigid frame-continuous beam composite system bridge constructed by asymmetric closure, four closure schemes were designed from two aspects: asymmetric closure sequence and temporary anchorage and demolition sequence. Based on the finite element model, the internal force and alignment of the main girder of the four closure schemes were compared and analyzed, and the general rules of closure of this type of bridge construction were summarized. The analysis and comparison results showed that the internal forces of the main girders are basically the same with different closure schemes, and the final linear shape of the main girders is different with different closure sequence. The results of this study can provide technical reference for sunhao2006@foxmail.com similar bridge construction decision-making and closure scheme determination.