Experimental Study on Shear Resistance of Segmental Prefabricated Assembled Box Girder Bridge
The method of longitudinal assembly of wet joints is widely used in segmental prefabricated bridges,but the research on the shear performance of the junction surface of wet joints is lacking.Taking a 20 m prefabricated prestressed concrete simply-supported box girder bridge of an expressway as the background,a full-scale model test of the segmental prefabricated box girder bridge was designed,and the shear performance of the wet joint segment of the bridge was investigated by combining finite element calculation and model test.The test shows that the deflection of the cast-in-place joint and the adjacent precast box girder are basically the same at the initial stage of the test.When the load exceeds 600 kN,the deflection difference increases significantly,and when the test load reaches 1100 kN,the joint surface between the wet joint and the box girder concrete loses the ability to transfer the load,and the test model shows failure.The test phenomena and the results of finite element calculation show that the failure mode of the box girder bridge with segmental precast assembly is first the cracking of the joint surface and then the cracking of the wet joint concrete.Applying and increasing the longitudinal prestressing can improve the load-bearing capacity of the segmental prefabricated assembled box girder bridge after the cracking of the junction surface.
box girder bridgesegmental prefabricated assemblywet jointshear performancefull-scale model testfinite element analysis
万方数据
维普
