箍筋约束混凝土的单轴力学性能研究

Study of uniaxial mechanical behavior of concrete confined with hoops

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 effect of overlapping hoops on mechanical behavior of concrete under uniaxial compression was deeply studied.The uniaxial constitutive model proposed by Saatcioglu was improved.The relationship between parameters in Saatcioglu model and the stirrup characteristic was derived,so that the improved model can be more convenient for the analysis of reinforced concrete structure in China.The formula of peak stress of confined concrete was established based on the analysis of a large number of existed testing data.Comparison of the calculated results and the experimental results shows that the formula proposed has good accuracy and it is simple in form and few in parameters which is suitable for circular and rectangular cross-section,as well as in calculation and analysis of practical engineering.