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深入研究箍筋约束作用对混凝土轴心受压力学性能的影响,对Saatcioglu提出的约束混凝土单轴本构模型做了一定改进,推导了Saatcioglu模型参数与配箍特征值λv之间的关系,使之能更加方便地用于我国钢筋混凝土结构的计算分析中。对收集的多组试验数据进行研究,提出形式简单的峰值应力计算公式。计算结果与试验结果比较表明,提出的公式具有较好的计算精度,适用于圆形和矩形截面构件,且形式简单、参数少,适于在实际工程的计算分析中应用。
The influence of stirrups restraint on the axial compressive mechanical properties of concrete was studied in detail. The uniaxial constitutive model of confined concrete proposed by Saatcioglu was improved. The relationship between the parameters of Saatcioglu model and the characteristic value λv of the stirrup was deduced Which can be more conveniently used in the calculation and analysis of China’s reinforced concrete structures. Several sets of experimental data collected are studied, and a formula for calculating the peak stress in simple form is proposed. The comparison between the calculated result and the experimental result shows that the proposed formula has good calculation accuracy and is suitable for circular and rectangular section members with simple form and few parameters and is suitable for the practical engineering calculation and analysis.