Investigation of the Effect of Trigonometric Rotation of the Column on Punching Shear Capacity in Two-Way Hollow Slabs Using Finite Element Metho

Considering that the execution of column in two-way hollow slabs has some limitations especially in terms of architecture, so in some executions, the column has to be rotated, which will change the spherical balls spacing of the column edge and change the punching shear capacity. In this field of study, no laboratory research and numerical analysis have been performed so far. In the present research , after calibration of ABAQUS finite element software to experimental results, the effect of square column rotation with different spherical balls spacing from column edge, on punching shear capacity and failure mechanism (areas prone to damage) in two-way hollow slab is investigated.The results present that by increasing the spacing of spherical balls from columnedge to (S ≥d) at different angles of rotation, the punching capacity increases and then stabilizes. Under conditions where the spherical balls' distance from the edge of the column is less than (d), the punching shear capacity is reduced by increasing the angle of rotation of the column. This is due to the presence of a damage-prone area at a distance less than (d).