NUMERICAL INVESTIGATION ON SHEAR RESISTANCE OF RC BEAMS WITH DOWEL ACTION UNDER GENERAL LOADING

Sreenivasa Prasad JOSHI, Poluraju PALLEBOINA

Abstract


The study of shear strength of reinforced concrete beams was always a challenging for many researchers as lot of complexity involved in determining the contribution of each factor. In the recent experimental investigation conducted by the authors it was determined that ‘Va’ and ‘Vd’ are negligible in shear resistance of concrete beams and ‘Vcz’ plays a major role in determining the shear resistance with shear reinforcement provided. The present article is aimed at validating the experimental results obtained with Finite Element Module ‘ANSYS’. Regression analysis was carried out and corrected factor was applied to the previous empirical formula as proposed by the researchers and suitable empirical formula is formulated to evaluate the dowel force with shear reinforcement. To that aim, total sixteen specimens were cast and tested with increase in strength of concrete and variation in flexural reinforcement by keeping clear cover and effective span to depth ratio constant. For eight specimens preformed cracks were provided to eliminate aggregate interlocking effect and rest of eight specimens were controlled beams. Initially, the moment vs. displacement curvature      and strain vs. moment curvature responses were studied with the experimental values obtained to appraise the shear at uncracked compression zone and later aggregate interlocking force and dowel action were obtained based on the empirical expressions proposed by previous researchers.

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References


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