ELASTIC-PLASTIC IMPACT RESPONSE ANALYSIS AND IMPACT RESISTANT DESIGN OF STEEL PIPE CHECK DAM

Abstract

This paper presents a three dimensional dynamic analysis approach for the impact resistant design method of steel pipe check dam under the impact of huge rocks in the debris flow. First, the three dimensional elastic-plastic impact response analysis is developed by considering both local deformation and the strain-rate effect of steel pipe. Secondary, the impact resistant design procedure is developed by establishing the design criteria in which the response plastic rotation is compared with the limit plastic rotation capacity of the specified steel pipe member. Finally, this proposed design method is applied to the actual steel pipe check dam (so called B-type slit dam) and is compared with the current design method.