Numerical Analysis Of Mechanical Behavior Of Non-Steel-Cell Joint Section Of Steel-Concrete Hybrid Girder Bridge

Currently many steel-concrete hybrid girder bridges have been built in the world,but there is still no design specifications for the joint section of this kind of bridge, thedesign basis are insufficient. Studies on the joint section are mainly focus on specificprojects instead of on a certain type of joint section. Studies of PBL shear connectorare mainly carried out by push-out test; however, it is difficult for the push-out test toreflect the actual working state of the connector. For these Many Reasons, the analysisof non-steel-cell joint section of hybrid girder bridge and its inner PBL shearconnector is carried out in this paper. The conclusion of this paper can providedreference for the design of the joint section of the hybrid girder bridges.Firstly, the finite element model of non-steel-cell joint section is established byANSYS, the deformation and stress distribution of the FE model which is under thelongitudinal load including bending moments, axial forces and compression-bendingload are analyzed to study the mechanical properties of the non-steel-cell joint section.Secondly, comparison FE models are established to use the comparative analysismethod to analyze the function of stiffeners in strengthen steel box girder, bearingplate and the roof and floor of steel box girder which inserts into the concrete boxgirder in the joint section. Finally, the partial model of non-steel-cell joint section withPBL shear connector is established to analyze the stress state of PBL shear connectorin the joint section. Parametric analysis on the partial model is carried out to study theimpact of five parameters on the shear behavior of PBL shear connector.The results show that: stiffeners in strengthen steel box girder have a greatinfluence on the overall mechanical properties of the non-steel-cell joint section; theroof and floor of steel box girder which inserts into the concrete box girder can avoidthe stress concentration near the bearing plate; increasing the hole’s diameter andplate thickness of PBL shear connector, improving the strength grade of concrete andinstalling perforative rebar are all helpful to improve the PBL shear connector’s shearbehavior in the non-steel-cell joint section.