Study on ultimate up-lift bearing capacity of steel column base embedded in concrete pile cap with anti-punching shear bar

Nonlinear finite element analysis of pile caps of steel column base under unilateral load is carried out by ANSYS program in order to understand the enhance effect to ultimate up-lift bearing capacity of steel column base embedded in concrete pile cap with anti-punching shear bar.The results are revealed that the ultimate loads,the energy dissipation capacity and the stiffness in the final stage of the specimen with anti-punching shear bar is higher than that of the specimen without anti-punching shear bar.With the increasing of the reinforcement ratio of anti-punching shear bar,the ultimate up-lift bearing capacity is increased.But the increasing speed of the ultimate up-lift bearing capacity is slower than that of the reinforcement ratio.ANSYS program's results agree well with the calculated results with the formula of truss mechanic model.