基于损伤本构关系的钢筋混凝土双向压弯截面分析

Research on Reinforced Concrete Cross-section under Bi-bending and Compression Based on Damage Constitutive Relationship

基于混凝土材料的损伤本构关系和平截面假设,推导出钢筋混凝土双向压弯截面刚度矩阵的计算公式.为研究混凝土损伤本构关系对截面分析的影响,用推导的截面刚度矩阵进行钢筋混凝土双向压弯截面分析,理论结果与试验数据进行比较,二者吻合较好;并与用我国混凝土结构设计规范中的混凝土非线性分析本构关系分析的计算结果比较,二者计算结果相符.表明本文方法计算可行,并通过本文方法计算结果可以了解、评估结构内部的损伤分布情况.

According to Damage Mechanics, the stiffness matrix formula is derived for reinforced concrete （RC） cross-section under hi-bending and compression, based on concrete damage constitutive relationship and plane assumption. The concrete damage constitutive relationship＇s impact on RC cross-section is known by com- puting RC cross-sections under bi-bending and compression based on the derived stiffness matrix formula. The theoretical results are compatible with other existing experimental data, and with the computed based concrete constitutive relationship from Code for design of concrete structures in China. The method is thus proved effecfive. With the theoretical results, the internal damage in structures may be explored and evaluated.