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为了研究含有纳米炭黑或碳纤维的导电混凝土梁受荷过程中电阻变化规律与混凝土损伤之间的关系,通过比拟与试验数据回归分析方法,先建立混凝土梁电阻变化率与梁几何中性轴处应变的曲线关系,再结合损伤力学理论,建立损伤度与电阻变化率的函数关系,为导电混凝土材料或构件自身电阻诊断其内部损伤提供了新途径。研究表明:开裂前,混凝土梁的电阻变化率与梁几何中性轴处应变的关系用一次衰减指数函数方程拟合较好,通过拟合曲线的斜率可以直接反映出导电混凝土用于检测损伤的灵敏度,从而间接反映出混凝土损伤的程度。
In order to study the relationship between the resistance change law and the damage of concrete during the course of the load of the conductive concrete beam containing nano-carbon black or carbon fiber, through the comparison and experimental data regression analysis method, the resistance change rate of concrete beam and the strain The relationship between the damage degree and the rate of resistance change is established by combining with the damage mechanics theory. It provides a new way to diagnose the internal damage of the conductive concrete material or its own electrical resistance. The results show that the relationship between the resistance change rate of concrete beam and the strain at the geometric neutral axis of the beam before fissuring is better fitted by the exponential function of one-time attenuation. The slope of the fitting curve can directly reflect the effect of the conductive concrete on the detection of damage Sensitivity, which indirectly reflects the degree of concrete damage.