本文關(guān)鍵詞： PVA-ECC 拉伸應(yīng)變硬化特性 受壓構(gòu)件 ABAQUS 變形能力　出處：《華南理工大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：聚乙烯醇纖維增強(qiáng)水泥基復(fù)合材料(Polyvinyl alcohol Fiber-Engineered Cementitious Composites簡稱PVA-ECC)是一種拉伸變形性能優(yōu)越的水泥基復(fù)合材料,是通過微觀力學(xué)和斷裂力學(xué)原理對材料體系進(jìn)行系統(tǒng)設(shè)計(jì)和優(yōu)化得到的復(fù)合材料。PVA-ECC以其高韌性、耐腐蝕、耐沖切等優(yōu)點(diǎn)引起纖維混凝土領(lǐng)域的廣泛關(guān)注。國內(nèi)外許多學(xué)者和研究人員對PVA-ECC多項(xiàng)力學(xué)性能進(jìn)行了研究,取得了一系列豐碩的成果,但還沒有得到一些能廣泛應(yīng)用于實(shí)際工程設(shè)計(jì)的計(jì)算公式。本文回顧了PVA纖維增強(qiáng)水泥基復(fù)合材料的研究進(jìn)展,總結(jié)前人研究成果,選用具有代表性的PVA-ECC受拉應(yīng)力應(yīng)變曲線,對配筋PVA-ECC受拉構(gòu)件進(jìn)行力學(xué)分析,采用截面條帶法對試件進(jìn)行數(shù)值模擬分析,以驗(yàn)證理論推導(dǎo)的正確性。參考前人研究思路,選用具有代表性的PVA-ECC受壓應(yīng)力應(yīng)變曲線,對配筋PVA-ECC受壓構(gòu)件進(jìn)行力學(xué)分析,推導(dǎo)軸心受壓和偏心受壓兩種情況下對應(yīng)的承載力公式,采用截面條帶法對試件進(jìn)行數(shù)值模擬分析,并采用ABAQUS有限元軟件建模進(jìn)一步分析,以驗(yàn)證理論推導(dǎo)結(jié)果的正確性。最后,基于ABAQUS有限元軟件得出配筋PVA-ECC和鋼筋混凝土的荷載-位移曲線,并對兩者的變形能力做對比分析,具體的研究工作和取得的成果如下:1、歸納和總結(jié)國內(nèi)外關(guān)于PVA-ECC相關(guān)試驗(yàn)的研究成果,通過力學(xué)分析方法,對配筋PVA-ECC軸心受壓構(gòu)件的受力全過程進(jìn)行了分析,基于平截面假設(shè),結(jié)合物理方程和變形協(xié)調(diào)方程,推導(dǎo)得出配筋PVA-ECC在軸心受壓時各個階段的承載力公式。2、基于平截面假設(shè),對配筋PVA-ECC偏心受壓構(gòu)件的受力全過程進(jìn)行分析,推導(dǎo)得出了配筋PVA-ECC在小偏心受壓和大偏心受壓時各個階段的承載力公式。以一具體構(gòu)件參數(shù)為實(shí)例,得出構(gòu)件在受壓作用下的承載力M-N曲線。3、采用截面條帶法對配筋PVA-ECC受壓構(gòu)件進(jìn)行數(shù)值分析,得到其受壓M-N曲線,將數(shù)值分析結(jié)果與理論結(jié)果對比。4、應(yīng)用ABAQUS軟件分別對配筋PVA-ECC軸心受壓構(gòu)件和偏心受壓構(gòu)件進(jìn)行建模分析,將有限元分析結(jié)果與理論結(jié)果對比。5、應(yīng)用ABAQUS軟件研究了普通鋼筋混凝土材料和配筋PVA-ECC材料的變形能力,以及配筋率、軸壓比等因素對PVA-ECC構(gòu)件延性的影響。
[Abstract]:Polyvinyl alcohol fiber reinforced cement matrix composites (. Polyvinyl alcohol Fiber-Engineered Cementitious Composites. It is a kind of cement matrix composite with excellent tensile and deformation properties. PVA-ECC is a composite material with high toughness and corrosion resistance, which is obtained by the systematic design and optimization of the material system through the principles of micromechanics and fracture mechanics. Many scholars and researchers at home and abroad have studied the mechanical properties of PVA-ECC and obtained a series of fruitful results. However, some calculation formulas which can be widely used in practical engineering design have not been obtained. In this paper, the research progress of PVA fiber reinforced cement matrix composites is reviewed, and the previous research results are summarized. The typical PVA-ECC tensile stress-strain curve is selected to analyze the mechanical properties of the reinforced PVA-ECC tensile members, and the section strip method is used to simulate the specimens. In order to verify the correctness of the theoretical derivation, referring to the previous research ideas, the representative PVA-ECC compression stress-strain curve is selected to carry out mechanical analysis of reinforced PVA-ECC compression members. The corresponding bearing capacity formulas under axial compression and eccentric compression are derived. The section strip method is used to simulate the specimen and the ABAQUS finite element software is used to model further analysis. Finally, based on ABAQUS finite element software, the load-displacement curves of reinforced PVA-ECC and reinforced concrete are obtained. The specific research work and the results obtained are as follows: 1. Summarize and summarize the domestic and foreign research results of PVA-ECC related tests, through the mechanical analysis method. The whole process of bearing force of reinforced PVA-ECC axial compression member is analyzed. Based on the assumption of plane section, the physical equation and deformation coordination equation are combined. The formula of bearing capacity of reinforced PVA-ECC in each stage of axial compression is derived. Based on the assumption of plane section, the whole process of eccentric compression members of reinforced PVA-ECC is analyzed. The formulas of bearing capacity of reinforced PVA-ECC under small eccentricity compression and large eccentricity compression are derived. A concrete component parameter is taken as an example. The M-N curve. 3. The section strip method is used to analyze the reinforced PVA-ECC compression member, and the compressive M-N curve is obtained. Comparing the numerical analysis results with the theoretical results, the ABAQUS software is used to model and analyze the reinforced PVA-ECC axial compression members and eccentric compression members respectively. Comparing the finite element analysis results with the theoretical results, the deformation capacity and reinforcement ratio of ordinary reinforced concrete materials and reinforced PVA-ECC materials are studied by using ABAQUS software. The influence of axial compression ratio on ductility of PVA-ECC components.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TU528

【相似文獻(xiàn)】

相關(guān)期刊論文 前1條

1 李繼祥,許成祥,李勝中;高強(qiáng)混凝土矩形截面受壓構(gòu)件對稱配筋簡化計(jì)算[J];江漢石油學(xué)院學(xué)報(bào);2001年01期

相關(guān)會議論文 前2條

1 王重華;陳瑋璋;;受壓構(gòu)件的變截面長度系數(shù)的計(jì)算[A];中國機(jī)械工程學(xué)會物料搬運(yùn)分會第四屆學(xué)術(shù)年會論文集[C];1992年

2 方恬;;焊接H形截面鋼受壓構(gòu)件截面優(yōu)化設(shè)計(jì)[A];鋼結(jié)構(gòu)工程研究（五）——中國鋼結(jié)構(gòu)協(xié)會結(jié)構(gòu)穩(wěn)定與疲勞分會2004年學(xué)術(shù)交流會論文集[C];2004年

相關(guān)博士學(xué)位論文 前1條

1 劉占科;薄壁受壓構(gòu)件的畸變屈曲理論與試驗(yàn)研究[D];蘭州大學(xué);2015年

相關(guān)碩士學(xué)位論文 前3條

1 唐微;PVA-ECC受壓構(gòu)件計(jì)算理論及有限元分析[D];華南理工大學(xué);2016年

2 范華冰;基于混凝土力學(xué)的受壓構(gòu)件性能研究[D];武漢理工大學(xué);2006年

3 崔古月;受壓構(gòu)件斜截面承載力的試驗(yàn)研究[D];中國建筑科學(xué)研究院;2014年

，

本文編號：1458199