ABSTRACT
Based on the previous research of structural performance of composite truss girder with thick concrete deck in cable-stayed bridge, the reasonable degree of shear connection for such bridge was carried out here. Considering the material and geometric nonlinearity, a local finite element model was established to study the mechanical performance of the composite truss girder with thick concrete deck of the cable-stayed bridge. The influence of the shear connection degree on the mechanical performance of the composite truss girder is studied. Moreover, the shear lag effect of thick concrete deck of composite cable-stayed bridge is analyzed. The results indicate that the maximum relative slip of the interface occurs at the anchorage of the cable, and the relative slip of the interface increases obviously under the vehicle load. The degree of shear connection has a great influence on the stress of thick concrete deck, steel truss girder as well as studs. In addition, the closer to the auxiliary pier, the effective distribution width of thick concrete deck is gradually decreased, and it will increase with the thickness of concrete deck. On the above research results, the reasonable layout scheme of shear connection is obtained.
