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STUDY ON STRENGTH AND DEFORMATION OF PLASTIC CONCRETE UNDER CYCLIC LOADING AND UNLOADING
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摘要: 通过塑性混凝土在单调和循环加卸载下的试验，对不同加卸载作用下塑性混凝土的强度和变形性能进行研究。结果表明，经过循环加载后塑性混凝土的强度与单调直接加载相比有所降低，变化幅度均在10%以内；当循环加卸载最大荷载为单轴强度的60%时，塑性混凝土峰值应力大于其余循环水平下的峰值应力。塑性混凝土在循环荷载作用下的加载曲线与卸载曲线不重合，卸载曲线总是滞后于加载曲线，加载曲线和卸载曲线形成了封闭的塑性滞回环。滞回环面积的大小与循环加载最大荷载密切相关，与循环加卸载的次数无关，随着循环加卸载最大荷载的增大，滞回环面积相应增大，但滞回环的斜率保持不变，即变形模量保持不变。循环加卸载影响了塑性混凝土峰值应变，单调直接加载峰值应变大于循环加卸载作用后峰值应变。Abstract: Strength and deformation were studied on plastic concrete in different loading ways through direct and cyclic loading and unloading testing.Conclusions have been drawn: Peak strength reduces generally through cyclic loading,and the degree of change is less than 10%,and the peak strength of cyclic loading and unloading of the maximum value of 60% uniaxial one is more than the others,stress-strain in loading condition does not conform with that in unloading.The area between curve of loading and one of unloading does not change with times of cyclic loading,and increases with increment of the maximum cyclic loading.The slope of the curve of loading is about the same as the one of unloading.The strain of peak strength increase through cyclic loading.
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Key words:
- cyclic loading /
- and unloading plastic concrete /
- stress-strain /
- strength /
- deformation
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