左右梁高不同的钢结构异形节点抗震性能研究

发布时间：2018-05-26 13:25

本文选题：钢结构 + 异形节点域　；参考：《沈阳建筑大学》2014年硕士论文

【摘要】：随着高层钢框架结构的日益增多及建筑物空间使用功能的不同要求,出现了许多复杂体型的结构。因此存在着大量的非常规节点,这些非常规节点的两侧梁或上下柱的截面在节点核心处变化较大,其受力机理和变形特征明显不同于常规节点,所以工程界把它定义为异型节点。而近年来钢结构异型节点在大型工程项目中的应用日趋增多,但由于缺乏理论支持和经验积累,在异型节点的设计过程中,只能依据规范对常规节点的规定进行设计。这种设计方法只能满足节点的强度要求,无法保证结构的安全。因此有待开展钢结构异型节点的研究工作,了解其力学性能和破坏机理,建立合理适用的设计方法。本文提出了一种新型的节点形式：左右梁高不同的外加强环式钢结构梁柱异形节点,此节点具有节约建筑材料,施工方便等优点。通过有限元分析软件ABAQUS进行有限元分析并与试验相结合,研究了此新型节点的初始刚度、承载能力、抗震性能等特性。本文的主要工作：通过试验的方法对节点试件进行抗震性能的研究,其重点是对左右梁高不同的异形节点与梁高相同的常规节点进行抗震性能的对比分析。在本试验中选取了圆钢管柱和方钢管柱两种不同的外加强环式异形节点和相应梁高相同常规节点共七个试件进行试验研究；验证各个节点试件在低周往复荷载作用下的抗震性能、应力分布与破坏模态。在试验中梁高比和外加强环板为节点试件主要的变化参数,通过对试验结果的对比分析得到了梁高比变化与外加强环板对异形节点抗震性能的影响,在异形节点的抗震性能研究中分析了部分框架和梁柱节点域处的荷载-位移滞回曲线,骨架曲线,延性性能,耗能性能和刚度退化等性能；通过上述试验结果的分析对异形节点的抗震性能进行合理的评价并对合理的异形节点的构造提出建议。为验证有限元分析所得结果的可靠性,本文最后将材性试验得到的钢材应力-应变本构关系曲线代入有限元分析软件ABAQUS的本构模型中进行有限元分析。通过有限元分析结果与试验结果的对比,验证有限元分析的可行性。最后总结试验与有限元分析结果,给出此新型节点应用于工程实际的合理建议。
[Abstract]:With the increasing number of high-rise steel frame structures and the different requirements of the space function of buildings, many complicated structures have emerged. Therefore, there are a large number of unconventional joints. The cross sections of the beams or upper and lower columns on both sides of these unconventional joints vary greatly at the core of the joints, and their mechanical mechanism and deformation characteristics are obviously different from those of the conventional joints. So the engineering community defines it as an abnormal node. In recent years, the application of steel structure abnormal joints in large engineering projects is increasing day by day. However, due to the lack of theoretical support and experience accumulation, in the design process of irregular joints, the design of conventional joints can only be carried out according to the specifications. This design method can only meet the strength requirements of the joints and can not guarantee the safety of the structure. Therefore, it is necessary to develop the research work of steel structure abnormal joints, to understand its mechanical properties and failure mechanism, and to establish a reasonable and applicable design method. In this paper, a new type of joint is proposed: the Liang Zhu special-shaped joint of outer strengthened ring steel structure with different height of left and right beams, which has the advantages of saving construction materials and convenient construction. The initial stiffness, bearing capacity and seismic behavior of the new joint are studied by finite element analysis software ABAQUS. The main work of this paper is to study the seismic behavior of joint specimens by means of test. The emphasis is to compare and analyze the seismic behavior of the joints with different beam heights and conventional joints with the same beam height. In this experiment, seven specimens were selected from round steel pipe string and square steel pipe string, two kinds of externally strengthened ring shaped joints and the corresponding normal joints with the same beam height. The seismic behavior, stress distribution and failure mode of each joint specimen under low cycle reciprocating load were verified. In the test, the ratio of beam to height and the outer stiffened ring plate are the main parameters of the joint. Through the comparison of the test results, the influence of the beam height ratio change and the outer strengthened ring plate on the seismic behavior of the special shaped joint is obtained. The load-displacement hysteretic curve, skeleton curve, ductility performance, energy dissipation performance and stiffness degradation of some frames and Liang Zhu joints are analyzed in the study of seismic behavior of special-shaped joints. Through the analysis of the experimental results above, the seismic performance of special-shaped joints is evaluated reasonably and some suggestions are put forward for the rational construction of special-shaped joints. In order to verify the reliability of the results obtained from the finite element analysis, the stress-strain constitutive relation curve of steel obtained from the material behavior test is finally added to the constitutive model of the finite element analysis software ABAQUS for finite element analysis. The feasibility of finite element analysis is verified by comparing the results of finite element analysis with experimental results. Finally, the results of test and finite element analysis are summarized, and some reasonable suggestions for the application of this new joint in engineering practice are given.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU973.13;TU973.31

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