PVA-ECC受压构件计算理论及有限元分析

发布时间：2018-01-23 20:46

本文关键词： PVA-ECC 拉伸应变硬化特性受压构件 ABAQUS 变形能力　出处：《华南理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：聚乙烯醇纤维增强水泥基复合材料(Polyvinyl alcohol Fiber-Engineered Cementitious Composites简称PVA-ECC)是一种拉伸变形性能优越的水泥基复合材料,是通过微观力学和断裂力学原理对材料体系进行系统设计和优化得到的复合材料。PVA-ECC以其高韧性、耐腐蚀、耐冲切等优点引起纤维混凝土领域的广泛关注。国内外许多学者和研究人员对PVA-ECC多项力学性能进行了研究,取得了一系列丰硕的成果,但还没有得到一些能广泛应用于实际工程设计的计算公式。本文回顾了PVA纤维增强水泥基复合材料的研究进展,总结前人研究成果,选用具有代表性的PVA-ECC受拉应力应变曲线,对配筋PVA-ECC受拉构件进行力学分析,采用截面条带法对试件进行数值模拟分析,以验证理论推导的正确性。参考前人研究思路,选用具有代表性的PVA-ECC受压应力应变曲线,对配筋PVA-ECC受压构件进行力学分析,推导轴心受压和偏心受压两种情况下对应的承载力公式,采用截面条带法对试件进行数值模拟分析,并采用ABAQUS有限元软件建模进一步分析,以验证理论推导结果的正确性。最后,基于ABAQUS有限元软件得出配筋PVA-ECC和钢筋混凝土的荷载-位移曲线,并对两者的变形能力做对比分析,具体的研究工作和取得的成果如下:1、归纳和总结国内外关于PVA-ECC相关试验的研究成果,通过力学分析方法,对配筋PVA-ECC轴心受压构件的受力全过程进行了分析,基于平截面假设,结合物理方程和变形协调方程,推导得出配筋PVA-ECC在轴心受压时各个阶段的承载力公式。2、基于平截面假设,对配筋PVA-ECC偏心受压构件的受力全过程进行分析,推导得出了配筋PVA-ECC在小偏心受压和大偏心受压时各个阶段的承载力公式。以一具体构件参数为实例,得出构件在受压作用下的承载力M-N曲线。3、采用截面条带法对配筋PVA-ECC受压构件进行数值分析,得到其受压M-N曲线,将数值分析结果与理论结果对比。4、应用ABAQUS软件分别对配筋PVA-ECC轴心受压构件和偏心受压构件进行建模分析,将有限元分析结果与理论结果对比。5、应用ABAQUS软件研究了普通钢筋混凝土材料和配筋PVA-ECC材料的变形能力,以及配筋率、轴压比等因素对PVA-ECC构件延性的影响。
[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.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU528

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