Abstract
This study evaluates the effect of shear on the deflection of reinforced concrete (RC) beams subjected to combined bending and shear. A total of nine simply supported beams were manufactured with the shear span-to-depth ratio, tension steel ratio, and shear capacity ratio as test variables. The experimental results were used to evaluate the effect of shear on the deflection by separating them into flexural and shear deformations. The theoretical deflection of the specimens was calculated using the effective moment of inertia equation recommended by ACI 318-19 based on the curvature relationships and experimental results of the flexure critical beams. By comparing the experimental and analytical results, it was revealed that the deflection obtained using the ACI equation underestimated the experimental results by up to about 1.6 times when the shear effect was large.
Highlights
An experiment was performed to evaluate the effect of shear on the deflection of reinforced concrete (RC) beams subjected to combined bending and shear
From flexural tests of RC beams with tension reinforcement ratios of 0.3ρb and 0.6ρb and shear span-to-depth ratios of 2.5 and 4.0, when the amount of shear reinforcement recommended in the ACI code was satisfied, no additional deflection due to the change in the shear capacity ratio was observed
When the shear span-to-depth ratio was small or the tension reinforcement ratio was high, it was observed that the number of inclined shear cracks increased and their spacing narrowed because a relatively large shear force was applied to the shear span of the specimens
Summary
In an experimental study that illustrates these characteristics, Branson [2] proposed a relatively simple equation for the effective moment of inertia that uses the relationship between the bending moment at the time of cracking and the subsequent bending moment This formula was adopted in the ACI building code from 1971 to 2018 and used for calculating the deflection of RC beams [3]. Yu and Winter [5] investigated the deflection of RC beams subjected to uniformly distributed loads They proposed a simplified procedure for calculating the elastic deflection using the moment of inertia of the cracked section and a deflection calculation method that uses the flexural stiffness of uncracked concrete in the tension zone. The effect of shear on the effective moment of inertia and deflection of RC beams was experimentally evaluated in this study
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