The Study On Performance Of Explosion Resisting And Venting For Cuboid Structure Subjected To Blast Loading

In recent years,the explosion accidents of industrial buildings occur frequently in China,which pose a serious threat to people’s life and property safety.In the initial stage of explosion accidents for many industrial plants,the explosion accidents mainly occur in some particular explosive workshops.Subsequently,due to the lacking anti explosion capacity of the explosion workshop,the walls around the explosion workshop collapsed,thus expanding the scope of th e explosion.Therefore,strengthening the anti explosion ability of the explosion workshop can reduce the damage degree of the explosion to the workshop.Based on AUTODYN,the flow field distribution and dynamic response of square structure under internal explosion are studied in this paper,the function and opening position of the vent are also discussed.The specific research contents are mainly as follows:(1)Study on the distribution of flow field under explosion in a rigid enclosure-confined space: Firstly,a cube space(defined as a rigid model)with a thickness of 200 mm and a height of 6000 mm is built.The propagation characteristics of blast wave in the interior and the distribution of pressure field& impulse field on the structure surface are analyzed;By changing the parameters such as TNT equivalent,geometric dimension of the structure,roof slope mode and explosive height,the influence of the above factors on the distribution of pressure field &impulse field on the surface of the structure is analyzed.(2)Study on the dynamic response and anti explosion measures of cuboid closed structure under internal explosion: Walls and roofs are assumed to be elastoplastic(defined as elastoplastic models).The equivalent stress response,effective plastic strain response and displacement response of the closed rectangular structure under internal explosion are studied;Then,only one wall of interest is assumed to be an elastoplastic body(defined as a rigid elastic combination model),in the meantime,the rest of the structure is still assumed to be rigid.The results of the rigid elastic hybrid model are compared with those of the elastic-plastic model,and the applicability of the rigid elastic hybrid model to study the dynamic response of structure explosion is discussed;The influence of TNT equivalent,explosive height,wall thickness and material yield strength on the dynamic response of the structure is analyzed by using the rigid elastic hybrid model.(3)Study on the effect of opening the explosion relief port on improving the anti explosion performance of the structure: In the center of the roof of rigid model and elastic-plastic model,a square vent is provided in order to compare with calculation results when no vent is provided.The influence of t he vent on the distribution of the convection field is analyzed.At the same time,the influence of the area of the vent on the distribution of the flow field is analyzed by changing the area of the vent;Then,aiming at the rigid elastic hybrid model,cha nging the location and area of the opening,the influence of the location and area of the opening on the dynamic response of the opening wall is studied.