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中文摘要：
为了改善FRP包裹混凝土柱的延性及耗能性能,从数值模拟的角度提出了2个步骤的多阶FRP包裹混凝土柱有限元建模及分析方法,分别对多阶FRP包裹层和整个FRP包裹混凝土柱进行了理论分析,获得了理想状态下的多阶应力应变曲线,并与模型试验结果进行了比较.通过参数分析建立了一套多阶本构方程,以准确预测多阶FRP包裹混凝土柱的理想本构关系.误差分析表明：拟合公式结果与有限元计算结果比值的平均值接近于100%,变异系数均小于3.8%,提出的本构模型与有限元结果十分吻合,可用于精确预测多阶FRP包裹混凝土柱在理想状态下的应力应变曲线.
英文摘要：
In order to improve the ductility of fiber reinforced polymer（ FRP） composites,a 2-step simulation method was proposed to numerically simulate the theoretical bistable stress-strain behavior. Finite element models of the bistable FRP wrapping layer and the entire bistable FRP confined column were analyzed respectively,and the theoretical bistable stress-strain curve was compared with the experiment results. A new stress-strain model for bistable confined concrete was proposed after a serial of parameter analyses. According to the verification,it is concluded that the proposed model is very accurate and stable to predict the entire stress-strain behavior of bistable confined concrete.
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