Abstract
Abstract One of the most common destructive factors of reinforced concrete structures is fire. The shear strength is one of the major components of the concrete mechanical properties and plays a significant role in the overall behavior and failure of the concrete members. In this investigation, three concrete compressive strengths of 20, 40, and 80 MPa were tested to derive an equation to predict the shear strength of plain concrete. Then by conducting shear strength test on the specimens containing 0.25 and 0.5% of steel fiber and using a regression approach, an equation which predicts the shear strength of concrete was proposed. The accuracy of the proposed equation was verified by comparing the predicted values with the experimental result of the previous researches. Finally, the shear strength test was done at temperatures of 100, 200, 300, 400, 450, 500, 600 and 800 °C to derive another equation which predicts the shear strength of concrete based on the compressive strength, the volume fraction of the fiber and the target temperature. It was observed that the inclusion of 0.25 and 0.5% of steel fibers improved the shear strength of plain concrete at the tested temperatures on average by 8.82 and 13.44%, respectively. Meanwhile, it was observed that by increasing the temperature, the shear strength of the concrete decreases and with further increase in temperature to 450 °C they recovered their shear strength and then started to decline sharply.
Published Version
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