节点域箱型弱轴连接腹板开孔钢框架节点抗震性能研究

发布时间：2018-05-17 21:48

本文选题：节点域箱型加强式连接 + 弱轴连接　；参考：《长安大学》2017年硕士论文

【摘要】：在1994年美国北岭(Northridge)和1995年日本的阪神发生的两次大地震中,人们发现大量的梁柱焊接节点出现了脆性破坏,而梁本身并未有明显或未发生塑性变形。为了改善钢结构梁柱节点的受力性能,提高钢框架节点的延性和塑性变形能力,国内外学者开始对传统钢框架节点进行一系列的研究,并提出了新型延性节点的构造形式。然而国内外学者研究内容主要是梁柱节点的强轴方向,对梁柱节点弱轴方向,特别是工字形梁柱节点的弱轴方向节点的受力性能研究较少。本文在节点域箱型加强式工字形柱弱轴连接节点的基础上,利用有限元软件ABAQUS对节点域箱型弱轴腹板开孔型节点的力学性能进行分析,并与传统的节点域箱型弱轴连接节点进行对比分析,研究表明在弹性阶段节点域箱型弱轴连接腹板开孔型节点刚度和承载能力基本保持不变,在弹塑性阶段,腹板开孔型节点刚度和承载能力略有降低,但节点延性显著提高,滞回曲线也比较饱满,最终在腹板削弱处形成塑性铰,实现了塑性铰的外移,表现出了较好的塑性变形能力,是一种理想的延性节点型式。为了能够在实际钢框架弱轴方向采用此节点型式,本文采用有限元分析软件ABAQUS分别对节点域箱型弱轴连接腹板开孔型节点和采用此新型节点形式的空间钢框架进行研究。建立了节点的有限元模型,通过改变腹板开孔中心至蒙皮板边缘的距离B、开孔半径R、蒙皮板厚度、轴压比、钢材强度及梁线刚度等参数,研究这些参数对节点破坏形式、滞回性能、骨架曲线、延性、承载力的影响。研究结果表明,节点域箱型弱轴连接腹板开孔型节点在梁腹板削弱处形成塑性铰,实现塑性铰的外移,增强了节点的延性,比传统节点具有更好的耗能能力,并给出了腹板开孔削弱参数的范围,为节点域腹板开孔型节点弱轴连接节点的抗震设计提供了一定的理论依据。最后,建立了空间钢框架的有限元模型,研究腹板开孔中心至蒙皮板边缘的距离B、开孔半径R等参数对其受力性能的影响。并建立普通节点空间钢框架的有限元模型,与腹板开孔型节点进行对比分析。
[Abstract]:During the two major earthquakes in 1994 and 1995 in Hanshin, Japan, it was found that a large number of Liang Zhu welded joints had brittle failure, but the beam itself had not been plastic deformation. In order to improve the mechanical behavior of steel structure Liang Zhu joints and improve the ductility and plastic deformation ability of steel frame joints, scholars at home and abroad began to do a series of research on traditional steel frame joints, and proposed a new type of ductile joints. However, scholars at home and abroad mainly focus on the strong axis direction of the Liang Zhu node. There is little research on the weak axis direction of the Liang Zhu node, especially on the weak axis direction of the I-shaped Liang Zhu joint. In this paper, the mechanical properties of box type weak web opening joints in node domain are analyzed by using finite element software ABAQUS. The results show that the stiffness and bearing capacity of the joint are basically unchanged in the elastic stage, but in the elastoplastic stage, the stiffness and the bearing capacity of the joint are not changed in the elastic stage, and compared with the traditional joint with the box type weak shaft connection in the node domain, the results show that the stiffness and the bearing capacity of the joint are basically unchanged. The stiffness and bearing capacity of web opening joints are slightly reduced, but the ductility of the joints is significantly improved, and the hysteretic curves are also relatively full. Finally, plastic hinges are formed at the weakening point of the web, and the plastic hinges are moved out, showing good plastic deformation ability. It is an ideal ductile node type. In order to adopt this type of joint in the direction of weak axis of practical steel frame, this paper uses finite element analysis software ABAQUS to study the box type weakly connected web opening joint in the node domain and the spatial steel frame with this new type of joint respectively. The finite element model of the joint is established. By changing the distance between the opening center of the web and the edge of the skin plate B, the radius of the hole R, the thickness of the skin plate, the axial compression ratio, the strength of steel and the stiffness of the beam line, the failure mode of the joint is studied. Hysteretic performance, skeleton curve, ductility, bearing capacity. The results show that the joint with box type weakly connected web in the joint domain forms plastic hinge at the place where the beam web is weakened to realize the external displacement of the plastic hinge and enhance the ductility of the joint. The joint has better energy dissipation ability than the traditional joint. The range of the weakening parameters of web opening is given, which provides a theoretical basis for the seismic design of weakly axially connected joints with web openings in the joint domain. Finally, the finite element model of the spatial steel frame is established, and the influence of the distance from the center of the web opening to the edge of the skin plate, the radius R of the opening hole on the mechanical performance of the steel frame is studied. The finite element model of common joint spatial steel frame is established and compared with the web opening joint.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391;TU352.11

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