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在役钢筋混凝土结构的箍筋往往发生锈蚀,对约束混凝土的应力-应变关系具有显著影响。鉴于此,综合考虑箍筋锈蚀对峰值应力和应变软化段斜率的影响,建立了锈蚀矩形箍筋约束混凝土的本构关系模型。首先揭示了箍筋锈蚀对约束混凝土应力-应变关系曲线的影响规律;然后基于36组锈蚀矩形箍筋约束混凝土棱柱体的轴压试验,建立了锈胀裂缝宽度和配箍特征值与峰值应力和应变软化的修正系数之间的关系;进而在经典的Kent-Scott-Park模型基础上,通过引入峰值应力和应变软化的修正系数来考虑箍筋锈蚀的影响,建立了锈蚀矩形箍筋约束混凝土的本构关系模型。分析结果表明,模型预测结果与试验数据吻合较好;随着锈胀裂缝宽度的增大,约束混凝土的峰值应力逐渐降低,而应变软化段的斜率逐渐增加。
The stirrups of reinforced concrete structures in service tend to rust, which has a significant effect on the stress-strain relationship of confined concrete. In view of this, considering the influence of stirrup stirrups on the peak stress and the slope of the strain softening section, a constitutive model of the rusted rectangular stirrup confined concrete was established. Firstly, the effect of stirrup reinforcement on the stress-strain curve of confined concrete was revealed; then, based on the axial compression test of 36 sets of confined concrete prisms with corroded rectangular stirrups, the rust expansion crack width and the hooping characteristic value and peak stress were established. The relationship between the correction coefficients of the strain softening; and then based on the classical Kent-Scott-Park model, the corrosion stress of the stirrup was considered by introducing the correction coefficient of the peak stress and the strain softening, and a rectangular rectangular stirrup confined concrete was established. Constitutive relationship model. The analysis results show that the model prediction results are in good agreement with the experimental data. With the increase of the crack width of the rust expansion, the peak stress of the confined concrete gradually decreases, while the slope of the strain softening section gradually increases.