单调轴向荷载下钢筋混凝土拉伸损伤本构研究

在已有的连续损伤理论基础上,研究综合考虑混凝土损伤、钢筋混凝土粘结滑移、以及受拉刚化效应等因素的钢筋混凝土拉伸本构模型,所提出的模型可以由其中各元件的本构特性推导出钢筋混凝土受拉损伤本构.该模型可以表征混凝土损伤、配筋等参数与钢筋混凝土试件受拉特性之间的量化关系,可以用于分析配筋受拉试件的初裂荷载、裂缝宽度等.通过与试验数据的对比得出了一些很有意义的计算与分析结果.

DAMAGING CONSTITUTIVE LAW OF REINFORCED CONCRETE SPECIMENS UNDER MONOTONIC UNIAXIAL TENSILE LOAD

Based on continuum damage theory, this paper presents a tensile damage model for reinforced concrete (RC). It takes into account overall concrete damage, bond-slip relationship, and tension stiffening effect. From the characteristics of each element that assembles the model, the constitutive relationship of RC specimens under uniaxial tensile load is derived. The influence of damage parameters and reinforcement ratio on the tensile behavior of RC specimens is considered in the model. In comparison with experimental data, the model also gives several meaningful results, such as crack width prediction and initial cracking load of an RC specimen.