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

本研究通过对结构材料的硬冲击压井、软冲击压井以及单元法等方面的阐述，对数值模拟在结构材料冲击压井中的应用进行了一系列的研究。主要内容概括如下：1.构件的硬冲击失效我们进行了各种混凝土构件的静力试验，比较了硬冲击破坏模式破坏试验完成前的冲击性能。详细分析了不同混凝土构件静力试验的荷载-位移关系中破坏所需的能量。然后，用冲击试验装置对钢筋混凝土结构的破坏形式、侵彻能、裂缝面积、结构冲击性能等进行了检验，为钢筋混凝土结构即将到来的飞行物的评估型式检验提供了基础数据。2.构件的软冲击失效利用减震材料(砂和橡胶)进行了一系列静态和相对软的冲击试验。混凝土构件与自重的碰撞点。这些故障的特征和减震能力已被明确。3.离散单元法在冲击破坏数值模拟中的应用我们将离散单元法应用于混凝土结构的破坏分析，这对于分析像颗粒体这样的不连续体是有效的。我们还开发了混凝土板穿孔。具体说明了二维问题的柱面单元方法，并提出了一种三维单元依赖的分析方法。结果表明，该方法对板结构的弹性问题和塑性冲击问题都是非常有效的。

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.