本文選題：鋼結(jié)構(gòu) + 異形節(jié)點(diǎn)域��； 參考：《沈陽建筑大學(xué)》2014年碩士論文

【摘要】：隨著高層鋼框架結(jié)構(gòu)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(fù)雜體型的結(jié)構(gòu)。因此存在著大量的非常規(guī)節(jié)點(diǎn),這些非常規(guī)節(jié)點(diǎn)的兩側(cè)梁或上下柱的截面在節(jié)點(diǎn)核心處變化較大,其受力機(jī)理和變形特征明顯不同于常規(guī)節(jié)點(diǎn),所以工程界把它定義為異型節(jié)點(diǎn)。而近年來鋼結(jié)構(gòu)異型節(jié)點(diǎn)在大型工程項(xiàng)目中的應(yīng)用日趨增多,但由于缺乏理論支持和經(jīng)驗(yàn)積累,在異型節(jié)點(diǎn)的設(shè)計(jì)過程中,只能依據(jù)規(guī)范對(duì)常規(guī)節(jié)點(diǎn)的規(guī)定進(jìn)行設(shè)計(jì)。這種設(shè)計(jì)方法只能滿足節(jié)點(diǎn)的強(qiáng)度要求,無法保證結(jié)構(gòu)的安全。因此有待開展鋼結(jié)構(gòu)異型節(jié)點(diǎn)的研究工作,了解其力學(xué)性能和破壞機(jī)理,建立合理適用的設(shè)計(jì)方法。本文提出了一種新型的節(jié)點(diǎn)形式：左右梁高不同的外加強(qiáng)環(huán)式鋼結(jié)構(gòu)梁柱異形節(jié)點(diǎn),此節(jié)點(diǎn)具有節(jié)約建筑材料,施工方便等優(yōu)點(diǎn)。通過有限元分析軟件ABAQUS進(jìn)行有限元分析并與試驗(yàn)相結(jié)合,研究了此新型節(jié)點(diǎn)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(yàn)的方法對(duì)節(jié)點(diǎn)試件進(jìn)行抗震性能的研究,其重點(diǎn)是對(duì)左右梁高不同的異形節(jié)點(diǎn)與梁高相同的常規(guī)節(jié)點(diǎn)進(jìn)行抗震性能的對(duì)比分析。在本試驗(yàn)中選取了圓鋼管柱和方鋼管柱兩種不同的外加強(qiáng)環(huán)式異形節(jié)點(diǎn)和相應(yīng)梁高相同常規(guī)節(jié)點(diǎn)共七個(gè)試件進(jìn)行試驗(yàn)研究；驗(yàn)證各個(gè)節(jié)點(diǎn)試件在低周往復(fù)荷載作用下的抗震性能、應(yīng)力分布與破壞模態(tài)。在試驗(yàn)中梁高比和外加強(qiáng)環(huán)板為節(jié)點(diǎn)試件主要的變化參數(shù),通過對(duì)試驗(yàn)結(jié)果的對(duì)比分析得到了梁高比變化與外加強(qiáng)環(huán)板對(duì)異形節(jié)點(diǎn)抗震性能的影響,在異形節(jié)點(diǎn)的抗震性能研究中分析了部分框架和梁柱節(jié)點(diǎn)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(yàn)結(jié)果的分析對(duì)異形節(jié)點(diǎn)的抗震性能進(jìn)行合理的評(píng)價(jià)并對(duì)合理的異形節(jié)點(diǎn)的構(gòu)造提出建議。為驗(yàn)證有限元分析所得結(jié)果的可靠性,本文最后將材性試驗(yàn)得到的鋼材應(yīng)力-應(yīng)變本構(gòu)關(guān)系曲線代入有限元分析軟件ABAQUS的本構(gòu)模型中進(jìn)行有限元分析。通過有限元分析結(jié)果與試驗(yàn)結(jié)果的對(duì)比,驗(yàn)證有限元分析的可行性。最后總結(jié)試驗(yàn)與有限元分析結(jié)果,給出此新型節(jié)點(diǎn)應(yīng)用于工程實(shí)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(xué)位授予單位】：沈陽建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU973.13;TU973.31

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