The failure of structure by incidental impact load and the design method of structure under impact

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In this research, a series of research on the application of the numerical simulation to the impulse kill of a structural material by the clarification of a hard impulse kill of the material and the impulse kill of a soft material and the individual element methods, etc. was done. The outline is brought together as follows.1.Failure of member by hard impactWe achieved static experiments of various concrete members to compare with impact behaviors before achievement of the failure experiments by hard impact failure mode. Energy required for failure from the load displacement relations of static experiment under various concrete members were examined in detail. Afterwards, a destruction form, penetration energy, crack area, and structural impact behavior etc. were examined using a heavy weight with an impact experiment device and the basic data for the evaluation type examination of the coming flying thing of the RC structure was presented.2.Failure of member by soft impactWe carried out series of static and relatively soft impact tests utilizing shock-absorbing materials (sand and r rubber.) on the collision point between concrete member and weight. Characteristics of these failures and shock absorbing ability have bee made clear. Moreover, the method of evaluating the impact failure of a concrete material comparing with a hard impact was examined.3.Application of distinct element method to the numerical simulation of impact failureWe applied distinct element method to failure of concrete structure that is effective for analysis of discontinuous body like the grainy bodies. We also developed it perforation of concrete plate. Method using cylinder element was concretely shown for two dimensions problem, and an analytical method on which three dimension elements depended was also developed. It has been shown that it is very effective to not only the elasticity problem but also the plasticity impact problem for the plate structure.