本文關鍵詞： PVA-ECC 拉伸應變硬化特性 受壓構件 ABAQUS 變形能力　出處：《華南理工大學》2016年碩士論文　論文類型：學位論文

【摘要】：聚乙烯醇纖維增強水泥基復合材料(Polyvinyl alcohol Fiber-Engineered Cementitious Composites簡稱PVA-ECC)是一種拉伸變形性能優(yōu)越的水泥基復合材料,是通過微觀力學和斷裂力學原理對材料體系進行系統(tǒng)設計和優(yōu)化得到的復合材料。PVA-ECC以其高韌性、耐腐蝕、耐沖切等優(yōu)點引起纖維混凝土領域的廣泛關注。國內外許多學者和研究人員對PVA-ECC多項力學性能進行了研究,取得了一系列豐碩的成果,但還沒有得到一些能廣泛應用于實際工程設計的計算公式。本文回顧了PVA纖維增強水泥基復合材料的研究進展,總結前人研究成果,選用具有代表性的PVA-ECC受拉應力應變曲線,對配筋PVA-ECC受拉構件進行力學分析,采用截面條帶法對試件進行數(shù)值模擬分析,以驗證理論推導的正確性。參考前人研究思路,選用具有代表性的PVA-ECC受壓應力應變曲線,對配筋PVA-ECC受壓構件進行力學分析,推導軸心受壓和偏心受壓兩種情況下對應的承載力公式,采用截面條帶法對試件進行數(shù)值模擬分析,并采用ABAQUS有限元軟件建模進一步分析,以驗證理論推導結果的正確性。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、歸納和總結國內外關于PVA-ECC相關試驗的研究成果,通過力學分析方法,對配筋PVA-ECC軸心受壓構件的受力全過程進行了分析,基于平截面假設,結合物理方程和變形協(xié)調方程,推導得出配筋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,對配筋PVA-ECC偏心受壓構件的受力全過程進行分析,推導得出了配筋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。以一具體構件參數(shù)為實例,得出構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受壓構件進行數(shù)值分析,得到其受壓M-N曲線,將數(shù)值分析結果與理論結果對比。4、應用ABAQUS軟件分別對配筋PVA-ECC軸心受壓構件和偏心受壓構件進行建模分析,將有限元分析結果與理論結果對比。5、應用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.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TU528

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