［提要］  混凝土矩形柱在FRP侧向强约束作用下，极限应力、极限应变的提高系数与FRP的包裹量及截面形状、特征有关。在对国内外大量试验结果分析的基础上，提出了FRP强约束混凝土矩形柱极限应力、极限应变的计算方法；FRP强约束矩形混凝土柱的应力应变全过程曲线可分为三段，第一、三段表现为线性特性，第二段为过渡区域，呈现非线性特性，但非常短暂，给出了两个能够反映曲线特征的应力应变关系模型，其预测结果与相关文献试验曲线符合很好；对影响FRP强约束矩形截面混凝土应力应变关系的参数进行了研究。

［关键词］  FRP  约束  矩形柱  应力应变  模型

Study on Stressstrain Relationship for Concrete Rectangular Columns Sufficiently Confined with FRP/Wei Yang1, Wu Gang1，2, Wu Zhishen2，3,Lü Zhitao1, Guo Zhengxing1(1 College of Civil Engineering, Southeast University, Nanjing 210096, China; 2 International Institute for Urban Systems Engineering, SEU, Nanjing 210096, China; 3 Department of Urban & Civil Engineering, Ibaraki University, Hitachi 3168511, Japan)

Abstract:For rectangular columns sufficiently confined with external FRP, the improvement of ultimate stress and stain is related to the amount of FRP and the shape and characteristics of the cross section. Based on the investigation on a large number of test results, equations predicting ultimate stress and stain were proposed. The stress strain curves of concrete rectangular columns sufficiently confined with FRP can be divided into three successive regions. The first and third regions are linear and the second region for the transition region shows nonlinear nature with very short extent. Two models which could reflect the characteristics of stress strain response were suggested. The predictions of the models are shown to agree well with test curves available in literatures. Finally, the parameters in the models were discussed.

Keywords:FRP; confinement; rectangular columns; stressstrain; models

1)东南大学土木工程学院，南京，210096；2)东南大学城市工程科学国际研究中心，南京

，210096；3)日本茨城大学工学部，日立 316.8511。