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采用ABAQUS有限元分析软件建立了三层三跨混凝土框架结构,研究了撞击位置、撞击质量和初始撞击速度对框架结构动力响应的影响。研究结果表明:撞击力峰值受初始撞击速度影响最大,其次是撞击质量,而撞击位置影响最小;梁跨中最大挠度和最终挠度受初始撞击速度的影响较大,而撞击位置和撞击质量对其影响较小;当撞击力作用于同层边跨梁时,相邻梁柱节点混凝土拉伸损伤较为严重,而当撞击力作用于同层中跨梁时,整个框架梁柱节点混凝土拉伸损伤相对较轻,但损伤分布相对较广;随着撞击质量和初始撞击速度的增大,整个框架结构损伤越来越严重,框架梁和梁柱节点是主要耗能部位。
The ABAQUS finite element analysis software was used to establish a three-storey three-span concrete frame structure. The influence of impact position, impact mass and initial impact velocity on the dynamic response of frame structure was studied. The results show that the peak value of impact force is the most affected by the initial impact velocity, followed by the impact mass, and the impact position is the least. The maximum deflection and final deflection in the beam span are greatly affected by the initial impact velocity. When the impact force acts on the girder of the same floor, the concrete damage of adjacent girder and column joints is more serious. When the impact force acts on the girder of the same floor, But the damage distribution is relatively wide. As the impact mass and the initial impact velocity increase, the damage of the whole frame structure becomes more and more serious. The frame beam and beam-column joints are the main energy-consuming parts.