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本文采用课题组已取得的实验研究结果 ,观测混凝土断裂全过程中基于粘聚力的新KR 阻力曲线的尺寸效应问题 .首先确定反映混凝土软化特性的软化本构曲线形状 ,对于简单实用的双线性软化本构曲线而言 ,取其拐点横坐标值为临界裂缝尖端张开位移 ,并引入一个直接影响混凝土软化本构曲线形状的参量λ ,结合实验结果 ,调整λ ,便得到用于计算新KR 阻力曲线的与实测结果相符的软化本构曲线形状 .结果表明 ,所获得的新KR 阻力曲线没有尺寸效应
In this paper, we have observed the size effect of the new KR resistance curve based on cohesion in the whole process of concrete fracture by using the experimental research results obtained by the research group.First, the shape of the softening constitutive curve reflecting the softening characteristics of concrete is determined, and for the simple and practical double-line In terms of the softening constitutive curve, taking the abscissa value of the inflection point as the critical crack tip open displacement, and introducing a parameter λ that directly affects the softening constitutive curve shape of the concrete, the λ is adjusted according to the experimental result, The softening constitutive curve shape of the KR resistance curve is consistent with the measured results. The results show that the resulting new KR resistance curve has no size effect