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本文采用TAW-2000微机控制岩石伺服三轴压力试验机,对室内配制普通混凝土圆柱体试件(高径比约2:1)进行单轴受压实验。测定了普通混凝土全应力-应变曲线。通过对试验的研究,循环加载条件下,确实形成了一个封闭的塑性滞回环,且峰后塑性滞回环随循环的次数的增加而变小变窄;加载应力和加载段变形模量呈一定的线性关系;峰后卸载点的应力和峰值应力差越大,峰后曲线的变化越明显,变得越平缓,重新加载曲线的趋近线斜率与初始变形曲线的趋近线斜率相差越大。
This paper adopts the TAW-2000 computer-controlled rock servo triaxial pressure testing machine to perform the uniaxial compression test on the ordinary concrete cylindrical specimen (with an aspect ratio of about 2:1). The full stress-strain curve of ordinary concrete was measured. Through the study of the test, a closed plastic hysteresis loop is indeed formed under cyclic loading conditions, and the post-peak plastic hysteresis loop becomes smaller and narrower as the number of cycles increases; the loading stress and the deformation modulus of the loading section are certain The linear relationship; the greater the stress and peak stress difference after the peak unloading point, the more obvious the change of the post-peak curve becomes, and the more gradual it becomes, the greater the difference between the slope of the approach line of the reload curve and the slope of the approach curve of the initial deformation curve.