Experimental Study On Seismic Behavior Of Steel Reinforced Concrete Squat Shear Walls With Steel Plates

Our research team had formerly conducted built-in vertical steel reinforced concrete squat shear wall experiments,which have shear span ratio of 1.0.Test results showed that the built-in vertical steel can restrain the development of main inclined cracks of squat shear wall,so that the deformation ability of wall was improved.In order to further improve the ultimate deformation ability of squat shear wall,on the basis of arranging vertical steel at the middle of wall,the strengthening plan of adding steel plates at the bottom of shear wall was put forward.We expected that the steel plates and built-in vertical steel can form perfect horizontal and vertical constraints,so that the seismic behavior of built-in vertical steel reinforced concrete squat shear wall can be further improved.In this paper,two cyclic loading tests of built-in vertical steel reinforced concrete squat shear walls with steel plates was conducted and compared with a specimen without steel plate.The influences of different steel-plate arrangements on seismic performances of shear walls were studied.Simulation of the whole horizontal loading process of built-in vertical steel reinforced concrete squat shear walls with steel plates based on finite element calculation software VecTor2 was conducted.The main conclusions of this paper are as follows:(1)The reasonable arrangements of steel plates can effectively improve the deformation capacity of built-in vertical steel reinforced concrete squat shear wall.The destroyed areas are evenly distributed.The total energy dissipation is increased by about 70%.The ultimate displacement angle is increased by about 20% and is greater than 1/100.(2)The load-bearing capacity of built-in vertical steel reinforced concrete squat shear wall is improved significantly by setting steel plates.(3)The number of steel plates at the bottom of shear wall should not be too much.The constraints of steel plates should be weaker from the bottom to the top of shear wall,in case the bottom of shear wall becomes local rigid areas becauce of too many constraints,then the destroyed areas will move upward,and the total deformation capacity of shear wall can not be exerted.(4)The simulation results of built-in vertical steel reinforced concrete squat shear walls with steel plates based on finite element calculation software VecTor2 are in good agreement with experiments.