EFFECT OF REINFORCEMENT ON PUNCHING SHEAR BEHAVIOR OF FLAT SLABS

Abstract

This study is carried out to investigate the behavior of 12 flat slab specimens having average characteristic compressive strength of approximately 35 MPa subjected to a concentric compressive load . The slab dimensions were the same for all twelve specimens, (1100 x 1100 x 120) mm, with a square column dimensions equal (150 x 150 x 400) mm at the center of slab. During testing, ultimate load, steel strain, cracking pattern and deformation were recorded. The experimental results are analyzed and compared against values estimated from different international design codes. Nonlinear finite element modeling using" ANSYS" program is made to conduct the numerical investigation of the general behavior of punching shear resistance. A new formula should be proposed for more accurate estimation of punching shear resistance of flat slab taking into consideration the effect of main factors of punching shear.