装配式斜支撑节点钢框架Pushover分析

发布时间：2018-05-29 01:37

本文选题：装配式钢框架 + Pushover分析　；参考：《湖南大学》2015年硕士论文

【摘要】：装配式钢结构的工厂化生产方式简化了现场施工程序,施工周期短,污染小,推广这种结构体系符合我国绿色环保的政策理念。作为一种新型的装配式钢结构体系,装配式斜支撑节点钢框架结构不仅成功实现了从多层向高层建筑领域的发展,而且其工厂模块化生产方式充分发挥了装配式钢结构的优势,施工周期被大大缩短。为了更好的推广这种新型的结构体系,有必要对其抗震性能进行深入研究。本文以某30层装配式斜支撑节点钢框架为研究对象,运用Pushover分析方法对其进行罕遇地震下的弹塑性分析,分析了该结构在地震作用下的反应,探讨了斜支撑在地震作用下对该结构抗震性能的影响。具体如下:(1)介绍了装配式斜支撑节点钢框架体系的研究现状,阐述抗震设计理论的发展进程及基于性能的抗震设计理论,简要介绍Pushover分析的国内外研究历史与现状,还介绍了Pushover分析方法在我国实际工程中的应用实例。(2)介绍了Pushover分析的基本原理,包括两个基本假定、等效单自由度体系的建立及水平侧力加载模式,简要介绍能力谱方法基本思想,分析了Pushover方法的优点。(3)通过对某30层装配式斜支撑节点钢框架进行模态分析、反应谱分析和Pushover分析,研究该结构的自振特性,探讨了该结构地震作用下的变形规律,并分析了塑性铰分布和发展规律,结果表明,在7度罕遇地震作用下,装配式斜支撑节点钢框架最大层间位移角为1/223,小于规范限制1/50,满足大震不倒的抗震设防目标,塑性铰大部分出现在桁架梁腹杆处,框架柱处于弹性状态,满足强柱弱梁的抗震设计要求,说明该结构具备良好的抗震性能。(4)为研究斜支撑对装配式斜支撑节点钢框架抗震性能的影响,选取无斜撑钢框架进行Pushover分析,并与装配式斜支撑节点钢框架分析结果进行对比,得出斜支撑的布置减小了该结构在地震作用下的变形,其中结构顶点位移减小33.4%~38.1%,结构最大层间位移角减小19.3%~43.1%。
[Abstract]:The factory production mode of prefabricated steel structure simplifies the field construction procedure, the construction period is short, the pollution is small, and the promotion of this structure system is in line with the policy idea of green environmental protection in our country. As a new type of prefabricated steel structure system, the fabricated oblique braced joint steel frame structure has not only successfully realized the development from multi-storey to high-rise building, but also its factory modular production mode has brought into full play the advantages of prefabricated steel structure. The construction cycle has been greatly shortened. In order to popularize this new structural system, it is necessary to study its seismic performance. In this paper, the Pushover analysis method is used to analyze the elastoplastic behavior of a 30-story steel frame with inclined braced joints under rare earthquake, and the response of the structure to earthquake is analyzed. The effect of oblique bracing on the seismic behavior of the structure is discussed. This paper introduces the research status of steel frame system with prefabricated oblique braced joints, expounds the development process of seismic design theory and performance-based seismic design theory, and briefly introduces the research history and present situation of Pushover analysis at home and abroad. This paper also introduces the application of Pushover analysis method in practical engineering in China. It also introduces the basic principle of Pushover analysis, including two basic assumptions, the establishment of equivalent single-degree-of-freedom system and the loading mode of horizontal lateral force. This paper briefly introduces the basic idea of the capability spectrum method, and analyzes the advantages of the Pushover method. Through modal analysis, response spectrum analysis and Pushover analysis of a 30-story steel frame with inclined braced joints, the natural vibration characteristics of the structure are studied. The deformation law of the structure under earthquake is discussed, and the distribution and development law of plastic hinge are analyzed. The results show that under the action of 7 degrees rare earthquake, The maximum interstory displacement angle of the steel frame with assembled oblique braced joints is 1 / 223, which is less than the limit of 1 / 50 of the code limit, and satisfies the seismic fortification target of strong earthquake. Most of the plastic hinges appear at the web of the truss beam, and the frame columns are in an elastic state. In order to study the influence of oblique bracing on the seismic behavior of steel frame with assembled inclined braced joints, the Pushover analysis is carried out on the steel frame without inclined bracing, which meets the requirements of seismic design of strong column and weak beam, and shows that the structure has good seismic performance. Compared with the analysis results of fabricated steel frame with inclined bracing joint, it is concluded that the arrangement of inclined bracing reduces the deformation of the structure under earthquake action, in which the top displacement of the structure is reduced by 33.4 / 38.1 and the maximum interstory displacement angle of the structure is reduced by 19.3and 43.1.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU391

【参考文献】