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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。
Due to its good mechanical properties and low economic costs, CFST structure has been widely used, so many studies have been made on it, but few studies have been done on it under the action of explosion, especially under internal explosion. Therefore, the analysis of CFST structure The deformation and destruction under the explosion are of great significance. In this paper, through experiments and numerical simulation methods, the deformation and failure of CFST under internal explosion with two prefabricated slits are analyzed. The results show that the deformation of the steel pipe occurs mainly near the slit, and the deformation increases with the increase of the amount of the steel. Finally, the steel pipe cracks around 45 ° at both ends of the slit, causing the shear failure of the concrete filled steel tube.