Numerical Simulation Of Concrete Reinforcing Steel Structure Response Implosion

Explosive Chamber is ensure waste vapor, fragment and energy containment during the testing of blast. Compared to free air detonations, the use of a detonation chamber reduces the environmental impact of explosive testing. So it was used to investigate detonation phenomena in much country's scientific research, national defense industry and so on. At the base of explosive chamber, steel concrete encapsulation structure is developed and used for explosive testing in it. The thickness of steel in steel concrete encapsulation structure is thin than explosive chamber which not enwrap by concrete, so use steel concrete encapsulation structure can solve the problem that armor plate have difficulty in jointing and winding into column when thickness is excess 3 centimeter, at same time it can reduce steel quantity and low cost. Dynamic response of resisting explosive load in steel concrete encapsulation is investigated by use theory analysis and numerical simulation.First, discuss wave impedance of concrete, which will influence the propagation process of stress wave, analyze stress of steel and concrete under the explosive load action .Second, analyze stress of steel and concrete under stable state gaseous mixture action from explosive, explain concrete that outside of explosive chamber will buildup resisting explosive load of whole structure. Consideration large deformation of material in explosive test, apply LS-dyna's multi-material arbitrary lagrangian Eulerian finite method and fluid-structure couple, investigate dynamic response characteristic of steel concrete encapsulation structure under explosive load inside it by use a numerical simulation method. Two kinds steel concrete encapsulation structure' dynamic response characteristic were investigated in detail by used numerical simulation method. By contrast result of computation and test, finding that computation result is believable. Summarize steel concrete encapsulation structure' dynamic response regulation under different equivalent of TNT. This paper can provide reference for structure design and optimize about resisting inside explosive load.Apply multi-material arbitrary Lagrangian Eulerian finite method and fluid-structure coupling can investigate steel concrete encapsulation structure' dynamic response characteristic. Steel structure, concrete present different stress state from plastic small deformation to plastic large deformation stage, represent different damage pattern .The concrete' radial stress of encapsulation structure attenuate rapidness than circumferential stress.