The Propagation Of BlastWave Influenced By Obstacles Shapes

With the spread of the terrorism,the explosion are more and more often used bythe terrorists. The terrorist explosive activities have seriously threatened to theinternational society's Peace and have been a cancer which does a lot of harm to thenational security and the social stability. This Paper studies the propagation rules ofblast wave. This paves the way for more important research later. Based on thepreviousresearchresults,thefollowingresearchesaredoneinthispaperbynumericalsimulation.(1)Regarding LS-DYNAprogram as the computational tool, the propagation rulesofblastwavethatisinfluencedbyfourdifferentbuildingshapeshavebeensimulated,including the generation and development process of the blast wave. And itemphatically analyzes four models'difference of reflecting and diffraction effect,explainingqualitativelytheinfluenceofobstaclesshapes.(2)Selectingtheoverpressuretime-historycurveofdifferent featurepointsonfourmodels, it comparatively analyzes the change law of peak overpressure and reflectingpeak overpressure on these points,explaining quantitatively the results of blast waveinfluencedbyobstaclesshapes.(3)It changes the stiffness of the models, and analyzes the displacement responsetime-history curve all the feature points on four models with considering couplingeffect of shapes and stiffness. It concludes the characteristics of displacementresponse.(4) Based on the previous research results,the author is in a creative wayto putsforward the principle of building shape design in the building explosion-proofconceptual design, and suggested the architecture designers and structure engineersshould cooperatively study the architectural plan in the architectural planning designphase.In the end, the content of this paper has been summarized and some problems,whichneedfurtherstudy,havebeenproposed.