Advanced Theory of Concrete Structures Chapter 2 Mechanical Behavior and Constitutive Relationships of Concrete and Steel Materials Xianglin Gu College of Civil Engineering,Tongji University 土本工程学院 gxl@tongji.edu.cn COLLEGEOP CIVILINGANEERING Xianglin Gu College of Civil Engineering, Tongji University gxl@tongji.edu.cn Chapter 2 Mechanical Behavior and Constitutive Relationships of Concrete and Steel Materials Advanced Theory of Concrete Structures