Deflection and strength of both reinforced and prestressed concrete beams subjected to impulsive loading with very short loading time such as 1 ms is studied experimentally, and the impulsive resistant of concrete beams and design of beams are discussed.
1. The method how to calculate the equivalent static load which yields as same deflection as the impulsive loading is presented.
2. The damping factor of reinforced concrete beams and the prestressed concrete beams was found to be 0.05～0.10.
3. Residual deflection and cracks remains after application of impulsive loading.
4. Concrete around the impulsive loading point is locally damaged. But, the residual strain of reinforcing bar is not so large. The beam could be used with carefull reparement.