6 research outputs found
Shear strength of reinforced concrete dapped-end beams using mechanism analysis.
yesA 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