Seismic performance research on wall-slab joints of new precast concrete shear wall structure

To assess the seismic performance of wall-slab joints of new precast concrete shear wall structure,the pseudo-static load test was carried out on two cast-in-situ and two new precast specimens.Combining with the means of nonlinear analysis,the seismic behavior was comprehensively analyzed including carrying capacity,deformability,force mechanism and failure mode and the reasonable wall-slab connect reinforcement's diameter was preliminarily discussed.Analysis results show that compared with cast-in-situ specimens,new precast concrete specimens show their similar seismic performance,i.e.higher carrying capacity,the same displacement ductility coefficient and plump hysteretic circle.The connect reinforcements have even force distribution and the joints perform better force integrity.The failure modes are all bending failure in plastic hinge region in the root of the slab.When the diameter of the connect reinforcement is 10mm,the joints can meet the force-bearing demand.New precast concrete wall-slab joints demonstrate a good seismic performance and can be one seismic fortification line of new precast concrete shear wall structure.