Abstract
In this study, six square reinforced concrete flat plates with dimensions of (1500×1500×100) mm were tested under a concentrated load applied on a column located at the center of the slabs. One of these slabs was the control specimen, whereas, in the others, steel angles (steel collars) were used, fixed at the connection region between the slab and the column to investigate the effect of the presence of these collars on punching shear strength. Five thicknesses were used (4, 5, 6, 8, 10mm) with constant legs of angles (75×75) mm of the steel collars to investigate the effects on the punching shear resistance with respect to the control slab. The results of the experimental study show that the punching shear resistance increased by 41 to 77% when steel collars were used. The experimental results were in good agreement with the numerical analysis acquired with the ABAQUS software.
Highlights
Through the past decades, many experimental tests have been performed to enhance the punching shear strength of Reinforced Concrete (RC) flat plates by using different mechanisms and materials such as Carbon Fiber Reinforced Polymer (CFRP), shear bolts, shear reinforcements, and steel plates, placed in the slab around the column
The experimental results showed that the ultimate load increased by about 67% with respect to the unbolted slab and the ultimate moment increased by 23% in comparison with the unbolted slab
The author in [3] tested RC flat plates strengthened with strips of CFRP, which passed through holes in the slab around the column and were wrapped around to form closed stirrups
Summary
Many experimental tests have been performed to enhance the punching shear strength of Reinforced Concrete (RC) flat plates by using different mechanisms and materials such as Carbon Fiber Reinforced Polymer (CFRP), shear bolts, shear reinforcements, and steel plates, placed in the slab around the column. Authors in [1] studied the strengthening of slab-column connection by drilling prestressed shear bolts in the slab regions around the columns These bolts have high tensile strength with steel plates at each end. Authors in [2] studied a strengthening method by utilizing steel plates on two-way square slabs subjected to punching loading. These steel plates were bonded in both sides (tension and compression) with epoxy and bolts in different patterns, numbers, and distributions. In this research, punching shear strengthening of RC flat plates is investigated by using steel angle sections (steel collars) fixed in the column-slab connection region by epoxy and stud bolts in the column. The analytical predictions of the punching shear capacity obtained with the use of the ABAQUS software were compared with the experimental results
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