闺 2.3 Strength and Deformation of Concrete 同海大学 士齐工鞋学悦 2.3.3 Compressive strength under axial load Prism and Cylinder strengthf andf Loading plate Prism and cylinder strength are used in China and United states for the purpose of analysis or design Specimen 150×150X300 f-0.76fcu 0150×300 f'=0.79fcu
6 2.3 Strength and Deformation of Concrete 2.3.3 Compressive strength under axial load Prism and Cylinder strength fc and fc •Prism and cylinder strength are used in China and United states for the purpose of analysis or design •fc=0.76fcu •fc '=0.79fcu Loading plate Specimen 150×150 ×300 or 150 ×300
2.3 Strength and Deformation of Concrete 同俩大学 土苏五鞋季花 0Jt期TN 2.3.3 Tensile strength under axial load Tensile strength fand split cylinder/cube strength fis 100 L150 .150 100 500 f0.395fm0.55 文应 f-0.19fu34 f-0.3f23 2F adl
7 2.3 Strength and Deformation of Concrete 2.3.3 Tensile strength under axial load Tensile strength ft and split cylinder/cube strength fts 100 100 150 150 500 d d f ts F F F F dl F f ts 2 = •ft=0.395fcu 0.55 •fts=0.19fcu 3/4 •fts=0.3fc 2/3
目 2.3 Strength and Deformation of Concrete 同海大学 士齐工鞋学悦 2.3.4 Factors affecting concrete strength Water/cement ratio Type of cement Supplementary cementitious materials Aggregate Mixing water Moisture conditions during curing Temperature conditions during curing Age of concrete Maturity of concrete Rate of loading
8 2.3 Strength and Deformation of Concrete 2.3.4 Factors affecting concrete strength Water /cement ratio Type of cement Supplementary cementitious materials Aggregate Mixing water Moisture conditions during curing Temperature conditions during curing Age of concrete Maturity of concrete Rate of loading
2.3 Strength and Deformation of Concrete 同两大学 土苏五鞋季花 0t期T 2.3.5 Failure criteria of concrete under biaxial loadings 1.21.0 -0.2 tention 02f -0.2 1.0 1.2 compression ō Many models have been proposed to describe the failure criteria of concrete under biaxial principle stresses
9 2.3 Strength and Deformation of Concrete 2.3.5 Failure criteria of concrete under biaxial loadings 1.0 1.0 1.2 1.2 -0.2 -0.2 2 /f c 1 /fc tention compression Many models have been proposed to describe the failure criteria of concrete under biaxial principle stresses
闺 2.3 Strength and Deformation of Concrete 同海大学 士齐五鞋学悦 2.3.5 Failure criteria of concrete under biaxial loadings Mohr's circle Principle tensile stress criterion Shear-compressive failure 近 ● 0.2 [(o/2)2+x205-o/2=f 01 π/f=(1+o/f)5 olf. -0.10.0 0.6 10 tensile strength Compressive strength
10 2.3 Strength and Deformation of Concrete 2.3.5 Failure criteria of concrete under biaxial loadings /fc /f c 0.2 0.1 -0.1 0.0 0.6 1.0 tensile strength Compressive strength Mohr’s circle f t 0.5 t t t 2 2 0.5 / (1 / ) [( / 2) ] / 2 f f f = + + − = Principle tensile stress criterion Shear–compressive failure