Abstract:

In order to meet the bearing requirements of prefabricated composite slab?column joints， two types of connection joints between steel?concrete?steel sandwich slab and structural column are proposed. Using ABAQUS finite element software， the numerical calculation model of composite slab column joint is established， and the bearing capacity of precast joint under punching load and the influence of main design parameters on its mechanical and deformation properties are analyzed. The results show that， compared with the cast?in?place joints under the same condition， the prefabricated connection joints can significantly increase the punching shear capacity while ensuring good ductility. These indicate that the connection components can make a positive contribution to the punching shear resistance of the joints.In addition， it is recommended to use a 16 through bolts radial arrangement and choose a square or cross shaped external diaphragm in the external diaphragm?thru bolt connection. The diaphragm’s strength grade is consistent with the composite slab， which is taken as Q345. For the cantilever composite slab?circumferential flange connection， it is suggested that the flange thickness should be controlled at about 20 mm， so as to make the joint own a higher cost performance.

Key words: prefabricated, slab?column joint, composite slab, numerical simulation, force analysis