Experimental Analysis and Numerical Simulation of Deformation and Destruction of CFST Subjected to Internal Blasting
内爆炸下钢管混凝土结构变形与破坏的试验分析及数值模拟

Structure of concrete-filled steel tube (CFST)is extensively applied due to its excellent mechanical properties and low economic cost. There are lot of investigations about CFST, but only little investigation is contributed to CFST subjected to blasting load especially to internal blasting load. So it is very significant to analyze the deformation and destruction of CFST subjected to internal blasting. Deformation and destruction of CFST with 2 precut slits subjected to internal blasting was analyzed based on experiment and numerical simulation. Results show that the deformation of outer steel tube occurs mainly near the precut slits, and the deformation size increases with the increase of explosive amount. The deformation eventually leads to cracks at both ends of slit towards about 45o direction and causes CFST shear failure.