同济大学：《高等混凝土结构理论》课程电子教案（PPT课件）Chapter 2 Mechanical Behavior and Constitutive Relationships of Concrete and Steel Materials

2.3 Strength and Deformation of Concrete 同俩大学 土苏五鞋季花 2.3.6 Failure criterion of concrete under triaxial loadings ar-fa =σFf f----lateral fluid fc=f+4.1f pressure O-fee

11 2.3 Strength and Deformation of Concrete 2.3.6 Failure criterion of concrete under triaxial loadings 1=fcc ' 1=fcc ' 2= 3= fL fL----lateral fluid pressure cc c L f ' = f '+4.1f

闺 2.3 Strength and Deformation of Concrete 同海女学 士齐工鞋季悦 2.3.7 Fatigue strength of concrete The term fatigue is the reduction in strength that occurs due to the progressive development of small cracks when subjected to fluctuating loads 0 Failure Fatigue strength

12 2.3 Strength and Deformation of Concrete 2.3.7 Fatigue strength of concrete The term fatigue is the reduction in strength that occurs due to the progressive development of small cracks when subjected to fluctuating loads f c f 3 2 1  Failure Fatigue strength<fc