轴心受压FRP约束圆形混凝土柱应力-应变模型

Stress-strain model of FRP-confined circular column subjected to axial compression

外包纤维复合材料(FRP)可以有效的提高混凝土柱的承载力和延性.本文系统总结了现有的几种FRP约束混凝土柱应力-应变模型,通过对已有大量试验研究结果的分析,指出FRP约束圆形混凝土柱的性能主要取决于FRP对混凝土柱的约束效果,引入约束效应系数ξ.并以约束效应系数ξ为主要参数,提出了FRP约束圆形混凝土柱三阶段应力-应变模型.该模型能较好的反映FRP约束混凝土柱应力-应变关系的特点,模型计算结果与试验数据吻合较好.

External confinement by the wrapping of fiber reinforced plastic（FRP） is an efficient technique to increase the loading-carrying capacity and ductility of concrete column.Several typical stress-strain models of FRP-confined concrete column are summarized in this paper,and it is pointed out that the behavior of FRP-confined concrete column is mainly related to the lateral confinement of FRP to concrete column by the analysis of a large number of experimental results,so the confinement effect coeffficientξis introduced. Taking ξ as a main parameter, a three portions stress - strain model of FRP - confined concrete column is proposed. The model captures the main characteristics of stress - strain relationship of FRP - confined concrete column, and the predictions of the model agree well with test data.