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Title: Cracking Shear Strength of Plain Concrete Based on Pushoff Specimens
Authors: Rawan Q. Saad 
Supervisor: Prof. Khaldoun N. Rahal
Keywords: cracking shear strength; plain concrete; shear transfer; pushoff specimens
Issue Date: 2017
Publisher: ย Kuwait university - college of graduate studies
Abstract: An accurate calculation of the full stress-strain relationship of reinforced concrete in shear and the minimum amount of transverse steel depends on the ability of accurately calculating the cracking shear stress. Thus, cracking caused by shear can be considered as a significant factor for evaluating the safety of concrete elements. Reinforced concrete subjected to shearing stresses can exhibit significant post-cracking and post-yielding strength. The cracking and pre-cracking part of the shear response has not been thoroughly studied, especially in shear-transfer types of elements. Therefore, more extensive testing is required in order to investigate a general trend of cracking shear strength in terms of the compressive strength of concrete. Due to the considerable variations in the conditions under which shear testing is commonly conducted, the effects of testing age, duration and location of moist curing/drying on the cracking shear strength of plain concrete are studied. Nine series of experimental testing on pushoff type specimens were designed with different concrete strengths, cast, cured under different conditions and tested at different ages. The shear-transfer planes of the pushoff specimen are not crossed by any transverse reinforcement. These pushoff specimens provide an indirect shear test of concrete in order to study some of the characteristics of the shear behavior of concrete. Based on the test results, an equation relating the cracking shear strength to the compressive strength of concrete is proposed. It was observed that the cracking shear strength of the testing specimens were underestimated by typical code equation for cracking shear strength. Also it was found that the cracking shear strength of concrete is strongly related to the testing age, the curing and drying conditions of specimens
Appears in Programs:0620 Civil Engineering

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