Abstract
Experimental results have shown shear capacities of concrete slabs under uniform loads sometimes considerably higher than those predicted by current concrete codes. Vertical compressive stresses transverse to the beam axis, or clamping stresses, are neglected in these analyses. The present study includes results from analytical and experimental research that was conducted to investigate the influence of clamping stresses on the shear strength of concrete slabs under uniform loads. Including clamping stresses in the Modified Compression Field Theory (MCFT) procedures was shown to considerably increase the shear prediction accuracy for members under uniformly distributed loads even for members with short shear spans. In addition, contrary to current sectional methods that give accurate results only in those regions where plane sections remain plane, results suggest that the MCFT with clamping stresses can provide reasonably accurate results in any region of a slab. Shear strength predictions from the MCFT with clamping were verified against 113 experiments from the literature and twelve tests designed and carried out during this work. Additional improvements in predicted shear capacities were achieved when tension stiffening was included in the calculations, an important issue for continuous members in which the shear critical region is close to the inflection point.
Published Version
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