This paper presents results of the first stage of an experimental research program on the pounding response of adjacent concrete structures during earthquake. It shows experimental results for longitudinal impact of concrete rods. The impact of concrete to concrete surfaces of the rods was studied and the coefficient of restitution was experimentally determined. Acceleration time histories were recorded and characteristics of the impact pulse was determined. The study was extended to include filling materials that had been placed in the joint between the impacting concrete surfaces to study their effect on the impact.
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