Tests were performed on deep beams under a midspan load to determine the scaling of cracking and ultimate load-carrying capacities of beams failing in shear. Two types of scaling procedures were used, one in which only the geometries are scaled (replica of mach models), the other in which both geometry and material properties are scaled (dissimilar-strength or environmental models). The results of twenty simply supported beams tested statically with span-to-depth ratios of 4.67, 3.88, 2.80, and 2.00 and comprising 1/4- and 1/2-scale models and laboratory prototypes are presented. Two prototype beams with L/d ratios of 4.67 and 3.88 were tested dynamically to provide some correlation between statically and dynamically loaded beams. Test results indicate that cracking loads can be adequately predicted from both replica and dissimilar-strength models and ultimate loads can be predicted from replica models for all span-to-depth ratios tested. When transition from beam to arch action occurs, the dissimilar-strength models underpredict the ultimate load-carrying capacity of the prototypes. (Author).

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