Experimental study on impact resistance of shear failure type of RC beams

In order to cumulate the fundamental data for establishing a rational impact resistant design procedure of shear failure type of reinforced concrete (RC) beams, static and weight faling impact tests are conducted. Here, two loading methods (iterative and single) are applied by using 2.94 kN steel weight. The total 18 RC beams used for these experiments of which rebar ratio P_t and shear span ratio a/d are varied P_t = 0.80, 1.82 % and a/d = 2.38, 3.57, 5.87, respectively. In order to investigate the dynamic response of RC beams, the time histories of weight impact force, reaction force and the mid-span displacement are measured. The results obtained from this study are as follows: 1) the characteristics of dynamic behavior of RC beams are much difference depending upon the failure modes: bending and shear failure modes; 2) when the shear bending capacity ratio α is less than 1.0, RC beams under impact loading reach the limit with shear type of failure; 3) an impact resistant design of shear failure type of RC beams may be performed based on the static capacity with some safety margin