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Title |
Influence of Inclined Reinforcement around Openings on the Shear Behavior of Reinforced Concrete Continuous Deep Beams
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Keywords |
연속 깊은 보 ; 개구부 ; 경사보강근 ; 최대내력 ; 상계치 이론 continuous deep beams ; web openings ; inclined reinforcement ; load capacity ; upper bound |
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Abstract |
Twelve reinforced concrete continuous deep beams having web openings within interior shear spans were tested to failure.All beams tested had the same geometrical dimensions. The main variables investigated were the opening size and amount of inclined reinforcement around openings. An effective inclined reinforcement factor combining the influence of the opening size and amount of inclined reinforcement on the structural behavior of the beams tested is proposed. It was observed that the load distribution, diagonal crack width, and load capacity of beams tested were greatly dependent on the effective inclined reinforcement factor which ranged from 0 to 0.171 for the test specimens. The higher this factor, the smaller the diagonal crack width and its development rate. A higher load capacity also developed in beams having effective inclined reinforcement factor above 0.077 than in the corresponding solid deep beams. A numerical technique based on the upper bound analysis of the plasticity theory is proposed to evaluate the load capacity of continuous deep beams having openings within interior shear spans. Predictions obtained from the proposed formulas are in good agreement with test results.
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