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运用有限元显式动力分析软件LS-DYNA,对三层框架结构在爆炸荷载作用下的非线性动力响应进行了研究。分析了炸药量、截面形式、钢筋布置形式以及配筋率等参数改变时框架结构的位移、应力变化情况,指出框架结构的节点、柱子根部、柱子跨中以及梁的跨中为结构的薄弱环节,尤以节点部位的破坏最为严重。研究结论可为结构抗爆设计及加固提供初步的理论依据。
The nonlinear dynamic response of the three-story frame under blast load was studied by using finite element explicit dynamic analysis software LS-DYNA. The displacement and stress changes of the frame structure when the parameters such as the amount of explosives, the cross section, the layout of steel reinforcement and the ratio of reinforcement are changed are analyzed. The weak points of the structure are pointed out, such as the nodes of the frame structure, the root of the column, the span of the pillar and the midspan of the beam , Especially the destruction of the node site is the most serious. The conclusion of the research can provide preliminary theoretical basis for antiknock design and reinforcement.