Single-layer Reticulated Shell Under External Blast Load Analysis Of The Dynamic Response

Large span space structures because of its beautiful appearance, the internal use of spacemore flexible and widely used, many exhibition halls, convention centers, stadiums and otherlarge public buildings have adopted this architectural form. Such buildings are often places ahigher concentration of population activities, but also easy to become a terrorist target forterrorist attacks, but with the advances in instrumentation and national vigilance against terroristattacks has increased, carrying explosives or other dangerous items into the building nearmaterial has been very difficult, so the terrorist bombings of buildings means also changing, donot rule out the use of balloons, remote control flying objects such as carrying explosives on topof the building resulting in an air blast damage to buildings, to achieve its the possibility ofkilling people. In view of this situation, a comprehensive analysis of blast loading characteristics,the establishment of blast loading model, using finite element software LS-DYNA for thesingle-layer reticulated shell structure numerical simulation in order to improve the structure oflarge-span space antiknock ability to minimize this class building when the explosion occurred inthe structure of the loss and damage, has important theoretical and practical significance.In this paper, nonlinear static and dynamic theory of two analysis methods based onLS-DYNA simulation software used for all kinds of space grid structures subjected to externaldamage under blast loading was simulated. Research work is as follows:The use of LS-DYNA software build explosives exploded in the air in the model, and verifythe validity of this model and the simulation accuracy; to use this software in the next spacestructures under blast loading in the dynamic response of simulation to do foreshadowing.Theestablishment of spatial spherical shell model to simulate the impact of blasting a huge release ofenergy in a very short period of time causing great damage to surrounding buildingscharacteristics; discussed in the single-layer reticulated shell structures under blast loadingpartial destruction of the form and the structure of the various parts of the impact pressure, andthus produce a series of nonlinear dynamic response, mainly reflected in the structure of thedisplacement, velocity, acceleration, etc., and the shell partially destroyed during a preliminarydiscussion.In the above on the basis of analysis, further discusses the big span single sphericalshell in the external explosion load net impact, by changing the explosion conditions and changethe conditions of the structural components, net shell node and displacement of the stress of a netshell pole change rule, that these factors on the net shell of the influence of deformation and failure. Summarizes the impact of convex-concave spherical explosion load net shell influencethe internal law, for the structure in the impact of the explosion was measures and effectivecontrol explosion-proof explosion hazard influence provide effective reference and basis.