M. R. A. KHALIL*. N. G. SHRIVE** and P. AMENY** *University of British Columbia, and **University of Calgary

Three-dimensional finite element analysis has been used to determine the stress distribution in walls constructed of 190 x 90 x 390 mm two-hole clay bricks. The magnitude and locations of the maximum stresses under a uniformly distributed load are used to examine existing masonry failure theories. The height of the units and alignment of the holes are shown to be important factors. In common practice, parts of end webs protrude into the holes and the resulting geometry creates substantial tensile lateral stresses. The results of the analysis indicate modifications which could be made to the brick design. The modification would result in perfect alignment of the holes, would reduce drastically the tensile lateral stresses, would lower significantly the maximum compressive stresses, and would improve the general performance of the wall.