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四、应力—应变关系1.单轴受压砼棱柱体或圆柱体在单轴受压情况下的应力—应变(σ-ε)全曲线(图10),包括了峰点两边的上升段和下降段.这在国内外已有许多试验研究,模式规范中采用Sargin建议的公式:y=(ax+bx~2)/(1+cx+dx~2) (16)式中 y=σ_c/f_(cm),x=ε_c/ε_(c1)(16a)σ_c,ε_c——砼的应力和相应的应变值;f_(cm),ε_(c1)——砼的抗压强度和相应的峰值应变,取ε_(c1)=-0.0022.
IV. Stress-strain relationship 1. The stress-strain (σ-ε) full-curve of a uniaxially pressed cylindrical prism or cylinder under uniaxial compression (Fig. 10) includes the rising segments on both sides of the peak and Falling segment. This has been a lot of experimental research at home and abroad. The model specification uses Sargin’s suggested formula: y=(ax+bx~2)/(1+cx+dx~2) (16) where y=σ_c/ F_(cm), x = ε_c/ε_(c1)(16a)σ_c, ε_c - stress and corresponding strain value of 砼; f_(cm), ε_(c1) —— compression strength and corresponding peak value of 砼Strain, take ε_(c1)=-0.0022.