The tensile strength of high-strength concrete is divided into three types: axial tensile strength, split tensile strength and bending strength. Because the axial tensile test is more complicated, it is rarely done; the split tensile strength test piece is cube in our country, and the cylinder is often used in other countries; the bending test often uses the rectangular cross-section simply supported beam with three-point loading, and the size of the beam is 150mm*150mm, the span is three times that of the beam. Other countries also use 102mm*102mm rectangular cross-section beams. The bending strength has a great relationship with the section size and maintenance conditions. The tensile strength of high-strength concrete increases with the increase in compressive strength, but their ratio decreases with the increase in compressive strength, but the ratio relationship between the three tensile strengths has no obvious relationship with the concrete strength. Below we give three empirical formulas for tensile strength for readers’ reference 1) Splitting strength The empirical formula for splitting tensile strength f(t,s) of high-strength concrete given by China Academy of Building Research F(t,s) )=0.3f(cu)^(2/3); The empirical formula for the split tensile strength of high-strength concrete recommended by the European norm CEB-FIP f(t,s)=0.3(f1)(c)^(2/3) ;The empirical formula for the split tensile strength of high-strength concrete recommended by the American ACI High-Strength Concrete Committee; f(t,s)=0.6(f1c)^(1/2);
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