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Title |
Numerical Modelling on the Strength of Reinforced Concrete Simpel-Continuous Deep Beams with Openings by an Upper-Bound Theorem
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Keywords |
깊은 보 ; 파계기구 ; 개구부 ; 상계치 이론 ; 유효강도 |
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Abstract |
Models to predict the ultimate strength of simply supported or continuous deep beams with web openings are proposed. The derived equations are based on upper-bound theorem. The concrete is assumed as a perfectly plastic material obeying the modified Coulomb failure criteria with zero tension cutoff. Reinforcing bar is considered as elastic-perfectly plastic material and its stress is calculated from the limiting principal compressive strain of concrete. The governing failure mechanisms based on test results are idealized as rigid moving blocks separated by a hyperbolic yield line. The effective compressive strength of concrete is calculated from the formula proposed by Vecchio and Collins. Comparisons with existing test results are performed, and they show good agreement
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