The paper presents an experimental investigation of the direct shear transfer behavior of fiber reinforced high-strength concrete. The experimental study was performed on steel fiber reinforced push-off specimens with or without conventional stirrups. For the specimens with plain steel fibers, significant increases in the shear strength of high-strength concrete were observed. In the tests involving the combination of steel fibers and conventional stirrups, major improvement in crack control and enhancement in shear strength were observed.
Hollow slabs are slabs of reinforced concrete in which voids allow the concrete to be reduced in size. This type of slab results in reduced raw materials Consumption and increased insulating properties to achieve sustainability goals. This paper reported an experimental research program focused on the study of the bending behaviour of the elements of hollow slabs of normal-strength concrete. Three models of the one-way concrete slab were cast, It had dimensions of 1020 mm length, 420 mm width, and 100 mm thickness. The first model did not contain holes (solid) and the second model contained five circler opening holes with a 50 mm diameter, while the third model contained five square opening holes with 44 mm dimension, where the area of the second and third model were the same despite the difference in the shape of the opening. The results showed that the bearing capacity of the circular hollow core slab is higher by 12% compared to the square hollow core slab according to the type of voids and both of holes made the hollow core slab with a decrease in load capacity of 11% to 25% when compared to the solid slab. The solid slab has lower deflection value compared to the two hollow slabs whose weight is reduced by 23% compared to the solid slab.
This paper summarizes the results obtained form tests on a series of three-edge simply supported high-strength reinforced concerete slabs with various volume fraction of steel fiber, percentage of reinforcement and rectangularity (lengh to width ratio). The results showed that the increase in volume fraction of steel fiber and percentage of reinforcement causes an increase in the carrying capacity of these slabs, while the increase in rectangularity causes a decrease in the load carrying capacity. The increase in the yield load over the yield line theory load (membrance action) for the volume fraction of steel fibers considered (0.4%-0.8%) are 3% and 15% respectively, while the percentage increase are of the order of 16% for steel ratio 0.15%. This is in a good agreement with the results of other studies [10, 16]
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