垂直撞击下混凝土框架结构振动响应及其影响因素分析

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。

Analysis of Vibration Response and Influencing Factors of Concrete Frame Structure due to Vertical Impact Loading

Byusing the finite element software ABAQUS we analyse the concrete frame structure with three storeys and three spans,and study the impact location, the impact mass, the initial impact velocity and the influence on the dynamic response of frame structure.The results show that the initial impact velocity hassignificant influence on the impact force peak,while the impact position has little influence on the impact force peak. The initial impact velocity has great influence on maximum deflection and ultimate deflection of beam, while the impact position and the impact mass have little influence; when the side-span beams are impacted, the adjacent beam-column joints suffer serious tensile damage, while when the mid-span beams in the same storey are impacted, the tensile damage in entire frame beam-column joints are relatively slight, but the distribution are relatively wide. With the increase of the impact mass and the initial impact velocity, storey the tensile damage of the whole frame structure is more and more serious, frame beams and beam-column joints are the main energy-consuming locations.