FRP约束圆柱混凝土受压应力-应变关系模型

Compressive stress-strain model for concrete of FRP confined cylinders

为建立纤维增强复合材料(FRP)约束圆柱混凝土受压应力-应变关系模型,分析了国内外305个轴心受压FRP约束混凝土圆柱试件的试验结果。分析表明,纤维特征值、FRP层合结构和加载方式是影响FRP约束圆柱混凝土受压应力-应变关系的3个主要因素。通过分析试验结果和已有的模型,提出了一个考虑上述3个因素的改进的FRP约束圆柱混凝土受压应力-应变关系模型,该模型包括强化型和软化型两种类型。比较表明,该模型与试验结果的符合程度好于已有模型。

To develop a compressive stress-strain model for fiber reinforced polymer （FRP） confined concrete, the test results of 305 axially loaded FRP confined concrete cylinder （FCC） specimens are analyzed. The analytic results indicate that the fiber characteristic value, the FRP laminate structure and the loading method are the three major factors that influence the compressive stress-strain relationships of concrete of the FCCs. By analyzing the 305 test results and the existing models, an improved compressive stress-strain model for concrete of the FCCs, with the three factors taken into consideration, is proposed. The model includes work hardening and softening. Comparing with the test results, the agreement of the proposed model is better than that of the existing models.