本文選題：節(jié)點(diǎn)剛度 + 強(qiáng)弱軸�。� 參考：《華南理工大學(xué)》2015年博士論文

【摘要】：常規(guī)結(jié)構(gòu)設(shè)計(jì)通常會(huì)把梁柱連接節(jié)點(diǎn)假定為理想剛接或者鉸接來(lái)進(jìn)行處理,隨著國(guó)內(nèi)外眾多學(xué)者對(duì)鋼結(jié)構(gòu)節(jié)點(diǎn)的分析研究越來(lái)越深,學(xué)術(shù)界普遍認(rèn)為鋼節(jié)點(diǎn)是具有一定轉(zhuǎn)動(dòng)剛度的。對(duì)于鋼結(jié)構(gòu)節(jié)點(diǎn)的研究,主要分為三種手段:試驗(yàn)研究,有限元分析,組件法。到目前為止,組件法主要應(yīng)用在常規(guī)節(jié)點(diǎn)形式中常規(guī)構(gòu)件的結(jié)構(gòu)性能分析上,對(duì)于一些特殊組件的性能分析還有所欠缺,而且沒(méi)有給出較為規(guī)范的條文說(shuō)明。隨著鋼結(jié)構(gòu)領(lǐng)域在建筑行業(yè)的迅速發(fā)展,越來(lái)越多的節(jié)點(diǎn)形式在多高層鋼框架結(jié)構(gòu)中得到應(yīng)用。對(duì)節(jié)點(diǎn)性能有個(gè)快速、初步的性能預(yù)估顯得越來(lái)越重要,組件法在這方面需要做出的修正和改進(jìn)也是必不可少的。本文的研究工作是從以下幾個(gè)方面展開(kāi)的:(1)設(shè)計(jì)了十組不同尺寸的T型連接件(T-stub),進(jìn)行了單調(diào)加載試驗(yàn)研究。通過(guò)對(duì)試件的翼緣板厚度、腹板厚度、螺栓間距、螺栓孔徑尺寸、螺栓尺寸、螺栓強(qiáng)度等參數(shù)的變化來(lái)考察T-stub的力學(xué)性能,明確T-stub的應(yīng)力分布、塑性發(fā)展、變性特點(diǎn)和破壞模式。(2)對(duì)比試驗(yàn)數(shù)據(jù),建立T-stub的有限元模型,提出T-stub的初始抗拉剛度的表達(dá)式。(3)設(shè)計(jì)了兩組帶外伸端板加勁肋的中柱節(jié)點(diǎn),進(jìn)行單調(diào)加載試驗(yàn),建立相應(yīng)的有限元模型,重點(diǎn)分析外伸端板加勁肋對(duì)整個(gè)節(jié)點(diǎn)域力學(xué)性能的影響,明確板內(nèi)的應(yīng)力流發(fā)展方向,提出外伸端板加勁肋的初始抗拉剛度表達(dá)式。(4)設(shè)計(jì)五組常見(jiàn)的中柱節(jié)點(diǎn),三組強(qiáng)軸裸節(jié)點(diǎn)(包括第三項(xiàng)中所提到的兩組中柱節(jié)點(diǎn))兩組弱軸裸節(jié)點(diǎn),進(jìn)行單調(diào)加載試驗(yàn),研究了每組節(jié)點(diǎn)域相關(guān)組件的受力特性。(5)結(jié)合中柱節(jié)點(diǎn)的試驗(yàn)分析結(jié)果,對(duì)五組節(jié)點(diǎn)的節(jié)點(diǎn)域部分進(jìn)行組件拆分,建立每一個(gè)組件的初始抗拉剛度模型,明確提出每組組件的剛度的計(jì)算方法,給出每組中柱節(jié)點(diǎn)的彈簧組合方法。(6)建立基于彈簧單元的Abaqus有限元分析模型,對(duì)第五項(xiàng)中的組件的彈簧剛度以及彈簧組合方法進(jìn)行驗(yàn)證。(7)結(jié)合彈簧單元算法給出不同節(jié)點(diǎn)形式的初始轉(zhuǎn)動(dòng)剛度計(jì)算方法,對(duì)組件法流程進(jìn)行了規(guī)范總結(jié),具體給出了較為準(zhǔn)確的組件模型的提取方法,邊界條件的設(shè)定方法,以及力學(xué)彈簧的組合方法,并對(duì)理論結(jié)果同試驗(yàn)結(jié)果產(chǎn)生的誤差進(jìn)行了分析研究。
[Abstract]:Liang Zhu joints are usually assumed to be ideal rigid joints or hinged joints in conventional structural design. With the increasing research on steel structure joints, many scholars at home and abroad have made more and more research on them.The academic circles generally think that steel joints have certain rotational stiffness.The research of steel structure joints is mainly divided into three methods: experimental study, finite element analysis and component method.Up to now, the component method is mainly used in the analysis of the structural performance of the conventional components in the form of conventional nodes, and there are still some deficiencies in the performance analysis of some special components.With the rapid development of steel structure in the construction industry, more and more joints have been applied in multi-high-rise steel frame structures.It is more and more important to estimate the performance of the node, and the modification and improvement of the component method in this respect is also necessary.In this paper, ten groups of T-joints with different sizes are designed from the following aspects: 1) T-stubs are designed, and the monotone loading tests are carried out.The mechanical properties of T-stub were investigated by analyzing the thickness of flange plate, the thickness of web plate, the spacing of bolts, the size of bolt aperture, the size of bolt and the strength of bolt. The stress distribution and plastic development of T-stub were determined.In this paper, the finite element model of T-stub is established, and the expression of initial tensile stiffness of T-stub is put forward. Two groups of mid-column joints with stiffening rib with extended endplate are designed and tested by monotone loading.The corresponding finite element model is established to analyze the influence of the stiffening rib on the mechanical properties of the whole joint domain, and the development direction of the stress flow in the plate is clarified.In this paper, the expression of initial tensile stiffness of stiffening ribbed plates is presented. (4) five groups of common mid-column joints are designed, and three groups of strong shaft bare joints (including two groups of mid-column joints mentioned in item 3) are designed to carry out monotone loading tests.In this paper, the mechanical characteristics of each group of related components in the node domain are studied. Combined with the experimental results of the column joints, the components of the five groups of joints are split, and the initial tensile stiffness model of each component is established.The method of calculating the stiffness of each group of components is put forward, and the method of spring combination of column joints in each group is given. (6) the Abaqus finite element analysis model based on spring element is established.The spring stiffness and spring combination method of component in item 5 are verified. 7) combined with spring element algorithm, the calculation method of initial rotational stiffness of different node forms is given, and the flow of component method is summarized.The more accurate method of extracting component model, the method of setting boundary condition and the method of combination of mechanical spring are given, and the error between the theoretical results and the experimental results is analyzed and studied.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU391

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