Fracture progress mechanism of concrete structures under dynamic loading

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In this study, to make clear the failure mechanism of concrete structures suffering dynamic forces, the following three investigations were conducted. In investigation of dynamic full-field measurement of strain, a new measuring method was developed utilizing the optical full-field measurement technique in order to examine the effect of stress velocity on failure behavior of concrete. In investigation of numerical methods of concrete structures subjected to dynamic loading, a novel method was proposed to evaluate cumulative damages in reinforced concrete slabs, by integrating the constitutive laws and failure criteria of concrete members in consideration of localized failure of concrete. At last, by summarizing the knowledge obtained from this study about effects of materials deterioration on dynamic structural performance of concrete members, the design manual of concrete caissons for breakwaters with high resistance against repeated impact loads was formulated.