本文選題：鋼筋混凝土節(jié)點(diǎn) + 反復(fù)荷載�。� 參考：《深圳大學(xué)》2013年碩士論文

【摘要】：鋼筋混凝土框架結(jié)構(gòu)梁柱節(jié)點(diǎn)是現(xiàn)代建筑結(jié)構(gòu)中最重要的組成部分之一。近幾年，，很多相關(guān)的研究都提出了改善鋼筋混凝土梁柱節(jié)點(diǎn)抗震性能的建議。但是由于反復(fù)荷載下鋼筋混凝土梁柱節(jié)點(diǎn)的受力復(fù)雜并且對(duì)很多因素反應(yīng)敏感，因此要精確分析地震荷載下節(jié)點(diǎn)的力學(xué)性能是相當(dāng)復(fù)雜的。研究表明節(jié)點(diǎn)的破壞過(guò)程與混凝土材料、鋼筋材料及鋼筋與混凝土間粘結(jié)滑移作用的非線性特點(diǎn)有很大關(guān) 系。本文主要研究了這些關(guān)鍵因素對(duì)地震荷載作用下的鋼筋混凝土梁柱節(jié)點(diǎn)有限元模擬分析的影響。本文首先建立了一個(gè)反復(fù)荷載作用下的圓形柱模型進(jìn)行ABAQUS混凝土損傷塑性（CDP）模型的參數(shù)研究，并給出了一些采用CDP模型進(jìn)行有限元分析 的建議。此外，本文還提出了一種簡(jiǎn)單有效的方法用于定義CDP模型中的損傷變量。除混凝土材料模型外，要更準(zhǔn)確地分析節(jié)點(diǎn)的力學(xué)性能還需要建立合適的粘結(jié)滑移模型。本文介紹了幾種經(jīng)典的粘結(jié)滑移模型，并以此為基礎(chǔ)提出了一種適用于在ABAQUS中進(jìn)行鋼筋混凝土梁柱節(jié)點(diǎn)分析的粘結(jié)滑移模型。利用ABAQUS用戶單元子程序（UEL）的架構(gòu)，本文開(kāi)發(fā)了用于實(shí)現(xiàn)這種模型的粘 結(jié)單元。通過(guò)對(duì)比鋼筋拉拔試驗(yàn)和柱反復(fù)加載試驗(yàn)的模擬與試驗(yàn)結(jié)果，粘結(jié)單元的可靠性得以驗(yàn)證。本文還在CDP模型參數(shù)研究的基礎(chǔ)上建立了反復(fù)荷載作用下的十字形性梁柱節(jié)點(diǎn)模型。選用了合理參數(shù)的CDP模型在節(jié)點(diǎn)模型中同樣表現(xiàn)良好，各項(xiàng)宏 觀分析結(jié)果均與試驗(yàn)結(jié)果較為吻合。與不考慮粘結(jié)滑移的模型相比，插入粘結(jié)單元的模型的計(jì)算結(jié)果表現(xiàn)得與試驗(yàn)結(jié)果更為接近。本文的研究表明混凝土模型和粘結(jié)滑移模型在對(duì)反復(fù)荷載作用下鋼筋混凝土結(jié)構(gòu)力學(xué)性能的分析計(jì)算中扮演著重要角色。CDP模型和粘結(jié)滑移單元在ABAQUS中的共同應(yīng)用為反復(fù)荷載作用下的RC梁柱節(jié)點(diǎn)的數(shù)值分析提供了一種有效方法。
[Abstract]:Reinforced concrete frame structure Liang Zhu joint is one of the most important components of modern building structure. In recent years, many related studies have put forward some suggestions to improve the seismic behavior of reinforced concrete Liang Zhu joints. However, the mechanical properties of reinforced concrete Liang Zhu joints under seismic loading are very complicated because of their complexity and sensitivity to many factors. It is shown that the failure process of the joints is closely related to the nonlinear characteristics of the bond-slip interaction between the concrete material, the reinforced material and the steel bar and concrete. In this paper, the influence of these key factors on the finite element analysis of reinforced concrete Liang Zhu joints under earthquake load is studied. In this paper, a circular column model under repeated load is first established to study the parameters of Abaqus concrete damage plastic (CDP) model, and some suggestions for finite element analysis with CDP model are given. In addition, a simple and effective method is proposed to define the damage variables in CDP model. In addition to the concrete material model, it is necessary to establish an appropriate bond-slip model to analyze the mechanical properties of the joints more accurately. In this paper, several classical bond-slip models are introduced, and a bond-slip model suitable for the analysis of reinforced concrete Liang Zhu joints in Abaqus is proposed. Based on Abaqus user unit subroutine (UELL), a bonding unit is developed to implement this model. The reliability of the bonding unit is verified by comparing the simulation and test results of steel bar drawing test and column repeated loading test. Based on the study of the parameters of the CDP model, the cross-shaped Liang Zhu node model under repeated load is established in this paper. The CDP model with reasonable parameters also performs well in the node model. The results of macroscopical analysis are in good agreement with the experimental results. Compared with the model without the consideration of bond-slip, the calculated results of the model inserted into the bonding unit are more similar to the experimental results. The research in this paper shows that the concrete model and the bond-slip model play an important role in the analysis and calculation of the mechanical properties of reinforced concrete structures under repeated loads. CDP model and bond-slip element are used in Abaqus. This paper provides an effective method for numerical analysis of RC Liang Zhu joints under repeated loads.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU375

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本文編號(hào)：2019201