In order to establish a simple and rational impact response analysis method for lightweight shear-failure type Reinforced Concrete (RC) beams with stirrup, three-dimensional elasto-plastic finite element analysis was conducted for total fourty-seven RC beams under falling-weight impacting. Here, tensile strength of concrete was assumed as 1/16th of compressive one. An applicability of the proposed analysis method was confirmed by comparing with the experimental results of fourteen beams. From this study, following results were obtained: 1) impact response waves and crack patterns can be rationally predicted by using proposed analysis method, and 2) ultimate shear capacity of the RC beams under impact loading can be rationally predicted by means of the proposed numerical analysis method considering a safety margin of 15 %.
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