硫酸盐腐蚀后混凝土单轴受压应力应变全曲线

Stress-strain curves under uniaxial compression of sulfate attacked concrete

测定了硫酸盐侵蚀混凝土在不同腐蚀时期的应力应变全曲线,受腐蚀后混凝土应力应变全曲线方程仍可采用现行设计规范中建议的方程进行拟合,拟合结果吻合较好,但其中的系数和特征点数值有所不同。经过分析发现受腐蚀后混凝土峰值应变与峰值应力的开方,拐点处和收敛点处应力与峰值应力有良好的线性相关性。

The whole stress-strain curves under uniaxial compression of concrete attacked by sulfate were obtained experimentally. The curves were fitted very well with the same form of equations for the concrete suggested in the structure design code, but with different coefficients and value of character value. Analysis found that the peak strain is linear with the square of peak stress, the inflection point stress, and the convergence point stress is linear with the peak stress.