Bending and shear behavior of reinforced concrete beams with circular openings
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Abstract
The main purpose of this research is to design and to study the effects of reinforced concrete beams with opening (no greater than 40 % of depth beam) to strength, and failure. Six sample beams with span length 3.00 meters were tested: 1) ACI-318-11 ’s beam; 2) E.I.T.(2564) ’s Code beam; 3) beam with small circular opening upper neutral axis, in the case of pure bending; 4) beam with small circular opening under neutral axis beam in the case of pure bending; 5) beam with small circular opening upper neutral axis beam in the case of combined bending and shear; and 6) beam with small circular opening under neutral axis, in the case of combined bending and shear. The results showed that the samples 3 and 4 yielded safety load capacity which exceed ultimate design strength and the failure is similar to the samples 1 and 2. Similar results are obtained from sample 5 and 6. However, diagonal crack started from the bottom of the beams 4 and 6 toward the center of opening.
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References
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