本文選題：鋼結構 + 異形節(jié)點域��； 參考：《沈陽建筑大學》2014年碩士論文

【摘要】：隨著高層鋼框架結構的日益增多及建筑物空間使用功能的不同要求,出現(xiàn)了許多復雜體型的結構。因此存在著大量的非常規(guī)節(jié)點,這些非常規(guī)節(jié)點的兩側梁或上下柱的截面在節(jié)點核心處變化較大,其受力機理和變形特征明顯不同于常規(guī)節(jié)點,所以工程界把它定義為異型節(jié)點。而近年來鋼結構異型節(jié)點在大型工程項目中的應用日趨增多,但由于缺乏理論支持和經(jīng)驗積累,在異型節(jié)點的設計過程中,只能依據(jù)規(guī)范對常規(guī)節(jié)點的規(guī)定進行設計。這種設計方法只能滿足節(jié)點的強度要求,無法保證結構的安全。因此有待開展鋼結構異型節(jié)點的研究工作,了解其力學性能和破壞機理,建立合理適用的設計方法。本文提出了一種新型的節(jié)點形式：左右梁高不同的外加強環(huán)式鋼結構梁柱異形節(jié)點,此節(jié)點具有節(jié)約建筑材料,施工方便等優(yōu)點。通過有限元分析軟件ABAQUS進行有限元分析并與試驗相結合,研究了此新型節(jié)點的初始剛度、承載能力、抗震性能等特性。本文的主要工作：通過試驗的方法對節(jié)點試件進行抗震性能的研究,其重點是對左右梁高不同的異形節(jié)點與梁高相同的常規(guī)節(jié)點進行抗震性能的對比分析。在本試驗中選取了圓鋼管柱和方鋼管柱兩種不同的外加強環(huán)式異形節(jié)點和相應梁高相同常規(guī)節(jié)點共七個試件進行試驗研究；驗證各個節(jié)點試件在低周往復荷載作用下的抗震性能、應力分布與破壞模態(tài)。在試驗中梁高比和外加強環(huán)板為節(jié)點試件主要的變化參數(shù),通過對試驗結果的對比分析得到了梁高比變化與外加強環(huán)板對異形節(jié)點抗震性能的影響,在異形節(jié)點的抗震性能研究中分析了部分框架和梁柱節(jié)點域處的荷載-位移滯回曲線,骨架曲線,延性性能,耗能性能和剛度退化等性能；通過上述試驗結果的分析對異形節(jié)點的抗震性能進行合理的評價并對合理的異形節(jié)點的構造提出建議。為驗證有限元分析所得結果的可靠性,本文最后將材性試驗得到的鋼材應力-應變本構關系曲線代入有限元分析軟件ABAQUS的本構模型中進行有限元分析。通過有限元分析結果與試驗結果的對比,驗證有限元分析的可行性。最后總結試驗與有限元分析結果,給出此新型節(jié)點應用于工程實際的合理建議。
[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.
【學位授予單位】：沈陽建筑大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU973.13;TU973.31

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