FRP约束混凝土柱轴心受压应力-应变模型

FRP约束混凝土的应力-应变曲线模型是土木工程的一个重要课题。结合第1段斜率、转折点坐标、第3段斜率等数学特征分析了应力-应变曲线的发展过程,指出理想模型需满足的条件,并指出传统模型的不足。提出了一个复合指数-直线模型,该模型对强化型和软化型曲线都适用,满足理想模型条件,克服了传统模型的缺陷。给出了模型参数的求解思路。对比分析表明新模型拟合结果与实测数据吻合良好,具有广泛的适用性。

Stress-Strain Model of FRP-Confined Concrete Column under Axial Compression

Stress-strain mathematical model of FRP-confined concrete plays an important role in civil engineering,and it should be well understood.Based on first region slope,turning point coordinate and third region slope,the development of stress-strain curve of FRP-confined concrete column is analyzed,and conditions which ideal mathematical model need to meet are point out.A new composite exponent-line model is proposed,which overcomes the weakness of conventional model and is available for both hardening and softening type stress-strain curves.Approaches to determine parameters of the proposed model are presented.Finally,the capability and accuracy of the proposed model in predicting the complete stress-strain process of FRP-confined concrete under axial compression are demonstrated through comparisons between predictions of the proposed model and test results.