锈蚀箍筋约束混凝土的本构关系模型

发布时间：2018-06-23 07:35

本文选题：约束混凝土 + 锈蚀箍筋　；参考：《建筑结构》2017年S2期

【摘要】：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。
[Abstract]:The stirrups of existing reinforced concrete structures are often corroded, which has a significant effect on the stress-strain relationship of confined concrete. Considering the effect of stirrups corrosion on the slope of peak stress and strain softening section, the constitutive relation model of corroded rectangular stirrups confined concrete is established. The influence of stirrups corrosion on the stress-strain curve of confined concrete is first revealed, and then based on the axial compression tests of 36 groups of corroded rectangular stirrups confined concrete prisms, The relationship between the crack width and hoop eigenvalue and the correction coefficient of peak stress and strain softening is established, and then based on the classical Kent-Scott-Park model, By introducing the correction coefficient of peak stress and strain softening to consider the effect of stirrups corrosion, the constitutive relation model of corroded rectangular stirrups confined concrete is established. The results show that the predicted results are in good agreement with the experimental data, and the peak stress of confined concrete decreases gradually with the increase of the crack width, while the slope of the strain softening section increases gradually.
【作者单位】：广西大学土木建筑工程学院;广西大学工程防灾与结构安全教育部重点实验室;广西防灾减灾与工程安全重点实验室;
【基金】：国家自然科学基金资助项目(51368006;51668008) 广西重点实验室系统性研究项目(2013ZDX06)
【分类号】：TU375

【相似文献】