CFRP约束高强混凝土应力-应变模型

Stress-strain Model for CFRP-confined High Strength Concrete

为研究碳纤维约束高强混凝土单轴受压性能和应力-应变关系,进行了碳纤维约束高强混凝土棱柱体单轴受压试验,考察了混凝土强度、碳纤维包裹层数等参数对其单轴受压性能的影响规律;将试验结果与国内外七个碳纤维约束混凝土棱柱体的应力-应变模型进行了比较,发现已有模型不能准确反映碳纤维约束高强混凝土的单轴受压性能;选取与试验结果整体趋势相近的Youssef模型,依据本文试验结果对应力-应变曲线的特征点进行了修正,建立碳纤维约束高强混凝土的应力-应变模型,模型预测结果与试验结果吻合较好。

In order to investigate uniaxial compression property and stress-strain models for high strength concrete （HSC） confined by carbon fibre reinforced polymer （CFRP）, uniaxial compressive tests of CFRP-confined high strength concrete prisms were carried out. The influence of concrete strength and layers of CFRP on the uniaxial compressive performance of CFRP-confined high strength concrete were studied. It was found that the existing models cannot accurately reflect the uniaxiat compressive performance of CFRP-confined high strength concrete by comparing seven stress-strain models with test results. Based on the Youssef＇ s model, feature points of stress-strain relationship were modified according to test results and a new stress-strain model was developed for CFRP-eonfined high strength concrete. The predicting results of the proposed model agree well with test data.