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Punching shear failure in thin slabs under concentrated loads can cause shear stresses near columns. The use of steel fiber is a practical way to improve a slab-column connection's punching strength and deformation capacity. In this study, the capacity and behavior of steel fiber-reinforced concrete flat slabs are examined under punching shear force. Ten small-scale flat slabs were tested, eight of which had steel fiber and two without. Two parameters are studied in this paper, which are the fiber volume ratio (from 0% to 2%) and the stub column load shape (circle and square). The test results include the concrete compressive strength, crack patterns, punching shear, and load-defection behavior of the slabs. Based on the experimental results, it was found that the punching shear capacity of slabs with steel fiber (S5) increased by 21.8% compared to slabs without steel fiber (S1), and the slabs with steel fiber had more ductility compared to the slabs without fiber. Doi: 10.28991/HIJ-2022-03-04-08 Full Text: PDF

This study focuses on benefits to be gained by using composite beams with concrete slab attached to a circular steel tube alternative IPE section in steel beam. The experimental research program was attitude to evaluate the flexural behavior of these composite beams with circular steel tube. A total of fourteen beams divided into seven test groups with different variable, were fabricated and testing under static loading conditions to determine the ultimate load and mode of failure of composite beam with circular steel tube. It was found, that the proposed structural system proved the qualification in flexural behavior, this mean; it can be used in building and construction as structural member resisting the bending. In addition, this composite beam can be used to pass through it the service work as electrical lines, mechanical heating, ventilating, etc. without need to increase floor height and web opening making that was cause increase building cost. Also the new proposed section can be used to transport water or oil.