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

Experimental Analysis and Numerical Simulation of Deformation and Destruction of CFST Subjected to Internal Blasting

钢管混凝土结构由于具有良好的力学性能和低经济成本而受到广泛应用,因此对它的研究很多,但对它在爆炸作用下尤其是内爆炸作用下的研究很少,故分析钢管混凝土结构在内爆炸下的变形与破坏具有重要意义。本文通过试验与数值模拟方法,分析了内爆炸下钢管混凝土结构在具有二条预制狭缝时的变形与破坏情形。结果表明,钢管变形主要发生在靠近狭缝处,变形大小随药量的增加而增大,最终导致钢管在狭缝两端出现约45°方向的裂纹,引起钢管混凝土剪切破坏。

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.