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Shear strength of reinforced concrete dapped-end beams using mechanism analysis.
Yang, Keun-Hyeok Lee, J.K.
Yang, Keun-Hyeok
Lee, J.K.
Publication Date
2011-02, 2011-02
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© 2011 ICE. Reproduced in accordance with the publisher's self-archiving policy.
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2010-02-17
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Abstract
A mechanism analysis based on the upper-bound theorem of concrete plasticity is developed to predict the critical
failure plane and corresponding shear capacity of reinforced concrete dapped-end beams. Failure modes observed in
physical tests of reinforced concrete dapped-end beams are idealised as an assemblage of two moving blocks separated
by a failure surface of displacement discontinuity. The developed mechanism analysis rationally represents the effect of
different parameters on failure modes; as a result, the predicted shear capacity is in good agreement with test results.
On the other hand, empirical equations specified in the Precast/Prestressed Concrete Institute design method and strutand-tie
model based on ACI 318-05 highly underestimate test results. The shear capacity of dapped-end beams predicted
by the mechanism analysis and strut-and-tie model decreases with the increase of shear span-to-full beam depth ratio
when failure occurs along diagonal cracks originating at the bottom corner of the full-depth beam, although the shear
span-to-full beam depth ratio is ignored in the Precast/Prestressed Concrete Institute design method.
Version
Accepted Manuscript
Citation
Yang KH, Ashour AF and Lee JK (2011) Shear strength of reinforced concrete dapped-end beams using mechanism analysis. Magazine of Concrete Research, 63(1): 1-17.
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Article