Experimental Studies On The Seismic Behavior Of Cast-in-situ Hollow Floor Slab-column Strengthened Connections

Cast-in-place hollow core concrete slab which has no beams is casted in place and constructed with pre–embedded components. With the advantages of light-weight, large-span, free-separation, increase to the story height, cast-in-place hollow core concrete Slab is getting more and more attention showing a broad application prospect. Under the action of vertical load and earthquake, the connections of hollow core concrete slab which transfers the vertical shear and unbalanced moment is failed easily, so it is necessary to study the seismic performance of the joint.This paper takes three specimens with different shear-resistant components and different layout of hollow tube as study object to study the seismic performance of the connections of three specimens which are basic specimen, specimen with connection bent-up bars, and specimen with connection section steel cross bridging.The study of this paper includes:1) The study of three cast-in-place hollow core concrete slab connections under unbalanced moment and low-cycle and reverse loading. Performance of the test specimens was evaluated of hysteretic curves, backbone curve, strength degradation, stiffness degradation, energy dissipation capacity and ductility, etc.2) Compared the test result of specimens with different connection shear-resistant components and different layout of hollow tubes, the seismic performance of specimens were analyzed.3) Based on the test, taking the finite element analysis software ABAQUS as the platform, compared and analyzed the database, the reliability of finite element modeling method was verified. A in-depth study of solid slab column connections, floor reinforcement, vertical distribution pipe, the configuration of different bending steel bars and the configuration of different steel cross bridging on the seismic performance of the plate column connections.