装配式斜支撑节点钢框架弹塑性动力时程分析

发布时间：2018-08-07 16:12

【摘要】：目前,装配式钢结构的应用越来越广,其主要构件在工厂中制作加工,然后在工程现场直接安装,施工周期短,效率高,节省现场作业量。装配式钢结构的发展与国家推行的住宅产业化发展战略相符,并且迎合当前节约能源、保护环境的主题,是建设节约型社会的一种良好结构形式。装配式斜支撑节点钢框架结构为一种新型装配式钢结构体系,也拥有着较好的市场前景和应用价值。但是这种新型结构体系在地震作用下动力性能如何,尚未经考证,所以对这种新的装配式斜支撑节点钢结构体系进行较为详尽的抗震性能分析显得尤为重要。本文以某实际工程中的装配式斜支撑节点钢框架结构为研究对象,对该建筑进行了7度罕遇地震下的抗震性能研究,具体如下:(1)介绍了结构抗震分析理论和装配式钢结构体系的发展历程,阐述了装配式斜支撑节点钢框架结构这种新型结构的特点及优势。(2)介绍了弹塑性动力时程分析的理论基础,包括弹塑性有限元模型和弹塑性动力时程分析的方法。弹塑性有限元模型分为三类:基于材料的模型、基于截面的模型和基于构件的模型,三者有区别也有联系。介绍了如何在弹塑性动力时程分析中通过地震波强度指标合理地选取地震波。(3)通过对装配式斜支撑节点钢框架和装配式无支撑节点钢框架进行了7度罕遇地震作用下的弹塑性动力时程分析。结果表明:斜支撑节点使结构整体刚度大幅提高,在7度罕遇地震下结构变形显著减小,在人工波作用下,装配式斜支撑节点钢框架比装配式无支撑节点钢框架结构顶点位移最大值减小达56.6%,层间位移角最大值减小达61.3%。对于装配式斜支撑节点钢框架来说,塑性铰大部分出现在桁架梁腹杆部位,立柱处于弹性阶段。(4)装配式斜支撑节点钢结构作为一种新的结构体系,时程分析中一些参数的选择会对分析结果产生较大的影响,为了合理考虑这些影响因素,以该结构为研究对象,系统地分析了地震波输入维数、重力P-Δ效应和阻尼比对装配式斜支撑节点钢框架结构罕遇地震下弹塑性动力时程分析的影响。
[Abstract]:At present, the application of prefabricated steel structure is more and more extensive, its main components are made and processed in the factory, then directly installed in the engineering site, the construction period is short, the efficiency is high, and the field work quantity is saved. The development of prefabricated steel structure accords with the development strategy of housing industrialization, and caters to the current theme of saving energy and protecting environment, which is a good structural form of building a conservation-oriented society. The fabricated steel frame structure with oblique braced joints is a new type of fabricated steel structure system, which also has a good market prospect and application value. However, the dynamic performance of this new structure system under seismic action has not been verified, so it is very important to analyze the seismic behavior of the new steel structure system with inclined braced joints in detail. In this paper, the aseismic behavior of the steel frame structure with prefabricated oblique braced joints in a practical project is studied under the rare earthquake of 7 degrees. The main contents are as follows: (1) the theory of seismic analysis and the development of fabricated steel structure system are introduced. The characteristics and advantages of the prefabricated steel frame structure with inclined braced joints are described. (2) the theoretical basis of elasto-plastic dynamic time-history analysis is introduced, including the elastic-plastic finite element model and the elastic-plastic dynamic time-history analysis method. The elastic-plastic finite element model is divided into three categories: material based model, cross-sectional model and component-based model. The three models are different and related. This paper introduces how to reasonably select seismic wave by seismic wave intensity index in elastoplastic dynamic time history analysis. (3) through 7 degree rare earthquake of steel frame with prefabricated oblique braced joint and steel frame of fabricated unsupported joint. The elastoplastic dynamic time history analysis is used. The results show that the overall stiffness of the structure is greatly improved by inclined braced joints, and the deformation of the structure decreases significantly under the rare earthquake of 7 degrees, and under the action of artificial wave, Compared with the fabricated steel frame with unbraced joints, the maximum displacement at the top of the fabricated steel frame with oblique braced joints is reduced by 56.6 and the maximum displacement angle between floors is reduced by 61.3. For the steel frame with prefabricated oblique braced joints, the plastic hinge appears mostly in the web of the truss beam, and the column is in the elastic stage. (4) as a new structural system, the steel structure with prefabricated oblique braced joints is a new type of structural system. The selection of some parameters in time-history analysis will have a great influence on the results of the analysis. In order to consider these factors reasonably, the input dimension of seismic wave is systematically analyzed by taking the structure as the research object. The influence of gravity P- 螖 effect and damping ratio on elasto-plastic dynamic history analysis of steel frame structure with prefabricated oblique braced joints under rare earthquake.
【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;TU311.3

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