摘要
考虑混凝土组成材料物理性能的差异性及横向变形的特点,基于混凝土单轴受拉弹簧模型,建立混凝土单轴受压随机损伤的细观模型。研究模型中弹簧的刚度比对损伤模式的影响,分析混凝土的破坏机理。根据不同强度等级混凝土的破坏模式,分别建立超高强高性能混凝土、普通混凝土及高强混凝土的随机损伤本构关系。建立混凝土单轴受压统一随机损伤本构关系。用理论值与试验结果比较,验证所提本构关系的有效性。
Based on the uniaxial tensile mesoscopic spring model of concrete,a uniaxial compression microscopic spring model is introduced.Considering the effect of material composition and horizontal deformation of concrete,a stochastic damage constitutive model of concrete is built.The effect of stiffness ratio on damage index and the mechanism of fracture is studied.Based on the research on different failure modes of concrete with different strength grade,the stochastic damage constitutive equations of super high strength and high performance concrete(SHSHPC),high strength concrete(HSC)and normal concrete are built respectively to establish the unified stochastic damage constitutive model.Compared with existing damage constitutive law and experimental results preliminarily,the feasibility of fractal damage constitutive law is verified.
出处
《土木工程学报》
EI
CSCD
北大核心
2010年第S2期241-245,共5页
China Civil Engineering Journal
基金
国家自然科学基金面上项目(50978281)
国家自然科学基金重大研究计划培育项目(90815005)
关键词
单轴受压
随机损伤
细观模型
破坏机制
uniaxial compression
stochastic damage
mesoscopic model
failure mechanism
