钢-混凝土混合梁桥无格室结合段受力性能的数值分析-结构工程专业论文.docxVIP

ABSTRACT 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, the design basis are insufficient. Studies on the joint section are mainly focus on specific projects instead of on a certain type of joint section. Studies of PBL shear connector are mainly carried out by push-out test; however, it is difficult for the push-out test to reflect the actual working state of the connector. For these Many Reasons, the analysis of non-steel-cell joint section of hybrid girder bridge and its inner PBL shear connector is carried out in this paper. The conclusion of this paper can provided reference 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 by ANSYS, the deformation and stress distribution of the FE model which is under the longitudinal load including bending moments, axial forces and compression-bending load are analyzed to study the mechanical properties of the non-steel-cell joint section. Secondly, comparison FE models are established to use the comparative analysis method to analyze the function of stiffeners in strengthen steel box girder, bearing plate and the roof and floor of steel box girder which inserts into the concrete box girder in the joint section. Finally, the partial model of non-steel-cell joint section with PBL shear connector is established to analyze the stress state of PBL shear connector in the joint section. Parametric analysis on the partial model is carried out to study the impact of five parameters on the shear behavior of PBL shear connector. The results show that: stiffeners in strengthen steel box girder have a great influence on the overall mechanical properties of the non-steel-cell joint section; the roof and floor of steel box girder which inserts into the concrete box girder can avoid the stress concentration near the bear