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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。
Through the test of plastic concrete under monotonous and cyclic loading and unloading, the strength and deformation performance of plastic concrete under different loading and unloading are studied. The results show that the strength of plastic concrete after cyclic loading is lower than that of monotonous direct loading, and the variation range is less than 10%. When the cyclic loading and unloading maximum load is 60% of uniaxial strength, the peak stress of plastic concrete is greater than the rest Peak stress at cyclic level. The loading curve and unloading curve of plastic concrete under cyclic loading do not coincide, the unloading curve always lags the loading curve, and the loading curve and unloading curve form a closed plastic hysteresis loop. The size of the hysteresis ring is closely related to the maximum cyclic load, which is independent of the number of cyclic loading and unloading. As the maximum cyclic loading / unloading increases, the hysteresis loop area increases correspondingly, but the slope of the hysteresis loop remains the same Modulus unchanged. Cyclic loading and unloading affected the plastic concrete peak strain, monotonous direct loading peak strain greater than the cyclic loading and unloading after the peak strain.