EXPERIMENTAL STUDY ON THE IMPACT BEHAVIOR AND
PERFORMANCE OF REINFORCED CONCRETE BEAM WITH
SOME ABSORBING MATERIALS
31st Our World in Concrete and Structures (OWICs) - 2006
S. Tachibana*, Kanazawa University, Japan
H. Masuya, Kanazawa University, Japan
S. Nakamura, Nihon Samicon Co., Ltd., Japan
Reinforced concrete beam, absorbing material, impact test
Protection structure against rock falls has a shock absorbing layer such as sand on
the top of structure in many cases. We have performed a series of impact experiments to investigate characteristics of behavior of reinforced concrete beam with a rubber plate or sand layer on impact point and without any cushion. We measured the crack patterns,
impact force, reaction force, load under sand layer and displacement of beam.
From experiment results, it has become clear that impact characteristics of behavior
of reinforced concrete beam are quite different under the condition at the impact point
and the span length. We have made them clear that the relationship between the mean
impact force given by impulse and the natural period of a beam and that the transmission energy to the beam is different under the impact conditions. It also has become clear that the ability of shock absorption of the sand is excellent in this series of impact experiments. Finally, we have shown the simple example of performance based design for the reinforced concrete beam under impact utilizing the experimental results.