The authors have investigated shear destruction of PC beams by impact given near support point, and this time we intend to study contribution of concrete itself to the phenomena. The PC beams used in this study have various shear-span ratios (1.5, 3.0 and 4.8), but have no stirrups, and both specimens were made regarding to presence or absence of prestress. Contents of the experiment were static-loading tests, impact-loading test and static loading test of damaged beams by the impact, and these tests lead understanding of the influence of shear-span ratio and effect of prestress on shear destruction of PC beams by impact.
