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为研究混凝土在循环荷载下的变形特性,进行了2种不同应变速率下(10~(-5)/s,10~(-4)/s)混凝土轴向循环加卸载试验,对混凝土残余塑性应变与卸载点应变的关系及其共同点应变与卸载点应变的关系进行深入分析,并采用改进的Weibull统计模型对循环加卸载曲线的包络线进行拟合。研究结果表明:混凝土在循环加卸载作用下应力应变曲线的包络线与单调荷载作用下的应力应变全曲线基本一致;改进后的Weibull统计模型能较好地拟合包络线。
In order to study the deformation behavior of concrete under cyclic loading, axial loading and unloading tests were carried out under two different strain rates (10 ~ (-5) / s, 10 ~ (-4) / s) The relationship between strain and unloading point strain and the relationship between common point strain and unloading point strain are analyzed in depth. The envelope of loop loading / unloading curve is fitted by the improved Weibull statistical model. The results show that the envelope of stress-strain curve under cyclic loading and unloading is basically consistent with the stress-strain curve under monotonic loading. The improved Weibull statistical model can well fit the envelope.