| The dissertation describes a systematic experimental program and includes results from approximately 150 reinforced concrete beams of four different geometrically proportionate sizes. The largest size is comparable to beams used in practice. Size effect on diagonal crack initiation, ultimate load capacity and deformation capacity is investigated. Concrete with compressive strengths of 6,250 and 10,600 psi was used. Two different shear-span to depth ratios (1.5 and 2.5) were used. The influence of stirrup reinforcement was also studied. The validity of current code equations (ACI, Comite Euro-International du Beton, (CEB) and Japan Society of Civil Engineers (JSCE)) is studied in light of results from this investigation as well as from exhaustive data compiled from published literature. Fracture mechanics based concepts have been used to characterize brittleness due to material and structural parameters. Recommendations for potential improvements in design procedures for shear capacity are discussed. |
