负载下CFRP约束混凝土应力-应变关系分析型模型

为研究负载水平对FRP(纤维增强复合材料)约束混凝土柱峰值应力和峰值应变的影响,根据32个CFRP(碳纤维增强复合材料)约束混凝土圆柱构件和16个CFRP约束混凝土方柱构件的试验结果,引入负载影响因子,对J G Teng提出的CFRP约束混凝土柱峰值应力和峰值应变计算公式进行修正.在此基础上分析了CFRP约束混凝土柱构件轴向-侧向应变关系,以J G Teng本构模型为主动约束关系,建立了负载下CFRP约束混凝土应力-应变分析型模型.研究结果表明:模型理论曲线与试验曲线接近,修正后的峰值应力和峰值应变与试验结果较吻合,圆柱构件的误差约10%,方柱构件的误差在15%左右. 

Analysis-Oriented Stress-Strain Model of CFRP Confined Concrete with Preload

In order to investigate the effect of preload ratio on the peak stress and peak strain of FRP (fiber reinforced plastics) confined concrete columns, based on the experimental analyses of 32 CFRP (carbon FRP) confined concrete circular columns and 16 CFRP confined square concrete columns, a preload factor was considered to modify the J G Teng's formulas of peak stress and peak strain of CFRP confined concrete column. Based on the above the axial-lateral strain relationship of CFRP confined concrete was analyzed, and an analysis-oriented stress-strain model was set up by considering the effect of preload and taking the constitutive model purposed by J G Teng as an active confined relation. The research results show that the stress-strain relationship is consistent with the experimental result, and modified peak stress and peak strain agree well with the test results, and the error margins for the circular column specimens and square column specimens are about 10% and 15%, respectively.