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为了研究框架结构在地下室内部爆炸时的连续倒塌特性,运用有限元显式动力分析软件LSDYNA建立了一个含有1层地下室、4层地上结构的钢筋混凝土框架结构分离式模型;考虑钢筋和混凝土共节点的连接方式,采用三阶段模拟法将不同炸药作用位置时结构的连续倒塌模式进行对比,分析梁、板、柱等主要受力构件的具体破坏方式;阐释结构在地下室内部爆炸后的不同倒塌破坏模式。结果表明:地下室内部爆炸发生后地上一层破坏严重,在地下结构柱附近爆炸使得结构节点处破坏严重,从而导致结构的连续倒塌。
In order to study the continuous collapse behavior of the frame structure in the explosion of the basement, a separate model of reinforced concrete frame structure with one basement and four stories above ground is established by using the finite element explicit dynamic analysis software LSDYNA. , The three-stage simulation method is used to compare the continuous collapse modes of structures under the different positions of explosives, and the concrete failure modes of the main force components such as beams, slabs and columns are analyzed; and the different collapse damages of structures after the explosion in the basement are explained mode. The results show that the damage of the ground floor after the explosion in the basement is serious, and the explosion near the underground structural column makes the node of the structure seriously damaged, resulting in the continuous collapse of the structure.