Abstract
A series of small-scale models of prestressed concrete reactor vessels, with and without perforations in the end slab, were loaded to failure. All vessels failed in shear. The presence of penetrations did not decrease the strength of the end slab. The behavior of the vessels is described. Using a finite-element model, the stress conditions in the end slab at the failure load are evaluated. A method for calculating the shear strength of a deep slab is described. The method consists of three consecutive steps. First, calculate the load at which the inclined crack is initiated. Second, determine the shape of the load-carrying dome that is carved out inside the slab. Third, calculate and evaluate the stress conditions in the dome.
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