水泥砂浆材料的静动态应力应变关系研究

Study on static and dynamic stress-strain relationship of cement mortar material

将欧洲规范(CEB—FIP1990)和我国GB50010—2002《混凝土结构设计规范》中建议的混凝土材料的应力应变关系用于描述水泥砂浆材料的静态变形特性,利用作者的试验结果分析模型参数的取值规律。研究表明,通过改变材料参数的取值,两规范建议的应力应变关系可较好地反映水泥砂浆材料的变形特性。在水泥砂浆材料应力应变关系的基础上,引入作者提出的单轴动态强度准则,得出单轴动态应力应变关系。通过文献中给出的水泥砂浆材料动态试验结果的验证,表明所提出的动态应力应变关系可较好地描述水泥砂浆材料单轴动态力学特性。

This paper uses stress-strain relationship of concrete proposed by European Code(CEB—FIP1990)and GB 50010—2002 Code for Design of Concrete Structures to describe the static deformation characteristic of cement mortar material,and uses the authors' experimental results to analyze a law of choosing model parameters.Research shows that the stress-strain relationship proposed two codes can satisfactorily reflect the deformation characteristic of cement mortar materials by changing the values of material parameters.Base on stress-strain relationship of cement mortar materials,the author introduces the uniaxial dynamic strength criterion to gain the uniaxial dynamic stress-strain relationship.It shows that the dynamic stress-strain relationship proposed this paper can satisfactorily describe uniaxial dynamic mechanical characteristic of cement mortar materials by verifying dynamic experimental results of cement mortar material given by the literature.