【作者】 马亚峰；

【导师】 安明喆； 吴彬；

【作者基本信息】 北京交通大学 ， 桥梁与隧道工程， 2006， 硕士

【摘要】 活性粉末混凝土(RPC)作为一种高性能结构材料，与常规混凝土相比，具有超高强度、高韧性、高耐久性等优良特点。用RPC材料进行结构设计，可以使结构轻型化，并改善结构的耐久性，减少使用期间的维修费用。RPC材料的本构关系是进行RPC结构非线性有限元分析和研究其设计理论的基础。由于RPC材料配制原理及性能的特殊性，常规混凝土的本构关系已无法适用于RPC材料。 本文基于经典弹塑性理论，在RPC200单轴受压强度与变形特性试验研究的基础上，对其本构关系和力学性能进行了研究，成果如下： 1．在高强、高性能混凝土轴心受压应力-应变全曲线测定方法的基础上，经过大量试验探索，科学设计出获得RPC200单轴受压应力．应变全曲线的试验方法，并成功测出了RPC200的下降段曲线。 2．基于常规混凝土现有的单轴受压应力．应变全曲线方程形式，通过严格的数学推导，建立了RPC200单轴受压应力-应变本构模型方程，并拟合了相关参数。 3．通过测定同一配合比RPC试件的立方体抗压强度，得出RPC200棱柱体抗压强度和立方体抗压强度的关系，并确定两者的比例系数为0.92。 4．通过试验研究，在RPC混凝土弹性工作区内，泊松比基本保持稳定，得出割线泊松比代表值为0.19，理论分析了RPC200单轴受压破坏形态和变形过程。 5．初步从中心质假说、最大密实理论、力学分析和硅粉对RPC材料的贡献等几个宏观方面探讨了RPC200的超高强机理。更多还原

【Abstract】 Compared with conventional concrete, Reactive Powder Concrete (RPC) possesses excellent properties such as ultra-high strength, high toughness and high durability etc. Application of RPC for structural design can lighten the weight of buildings, improve structure durability and reduce the maintenance expense. RPC200 constitutive relationship is the foundation for nonlinear finite element analysis and research on structural design theory. As the particularity of producing principle and mechanics performance, conventional concrete constitutive relationship is unfit for RPC.In this paper, RPC200 constitutive relationship and mechanics performance have been studied based on elasto-plastic theory and experimental investigation of RPC200 strength and deformation under uniaxial compression state. The results follow as:1. Based on the test methods of high strength and performance concrete in uniaxial compression, a proper method has been designed for obtaining RPC200 stress-strain whole curve by lots of tries. It is successful to gain the descending curve of RPC200.2. The stress-strain curve constitutive model equation of RPC200 under uniaxial compression has been founded by strictly mathematic deduction on the base of conventional concrete equation forms. Correlation parameters have been fitted too.3. The relationship between RPC200 prismoid strength and cube strength is established by measuring cube strength of RPC pieces with the same mixture ratio, and proportionality coefficient confirmed is 0.92.4. Through systemic experimental research, it is found that Poisson’s ratio is nearly constant in the elastic range of RPC. The typical value of secant Poisson’s ratio is 0.19. Also, RPC200 failure shapes and deformation process under uniaxial compression has been studied by academic analysis.5. The high mechanism of RPC200 has been studied tentatively from centroplasm hypothesis, most density theory, mechanics analysis and silicon powder contribution for RPC.更多还原