(1 哈尔滨工业大学， 哈尔滨 150001; 2 山东省建筑科学研究院， 济南 250031)

［摘要］近年来,已有不少纤维增强复合材料(Fiber reinforced polymer，简称FRP)约束混凝土圆柱的应力-应变关系模型，然而有学者指出，现有模型较难得到预测误差分别小于14%和35%的抗压强度模型和极限应变模型，因此FRP混凝土圆柱应力-应变关系的极限状态(即抗压强度fcc′和极限应变εcc)尚未得到较准确地预测。本文建立在较大数据库(418个试验数据)基础上，回归得到精度较高的强度模型和极限应变模型，进而得出预测趋势较好的两段式应力-应变关系模型，通过与现有模型的比较，本文模型能够对不同尺寸和不同约束水平的FRP约束混凝土圆柱的强度、极限应变和应力-应变关系做出较满意的预测。

［关键词］Fiber reinforced polymer； 混凝土圆柱； 强度模型； 极限应变模型； 应力-应变关系模型

中图分类号： TU375.3 文献标识码： A文章编号：  1002-848X(2016)S1-0934-07

Axial stress-strain model of concrete cylinders confined with FRP composite

Liang Meng1,2, Li Minghai2, Wang Wei1, Mei Zuoyun2, Song Xiaoguang2, Bi Xing2

(1 Harbin Institute of Technology, Harbin 150001， China; 

2 Shandong Provincial Academy of Building Research, Jinan 250031, China)

Abstract: Recently, many models of fiber reinforced polymer (FRP)-confined concrete have been developed to predict the axial stress-strain relationship of concrete cylinders with strain hardening performance. However, ultimate condition of FRP-confined cylinder(i.e.compressive strength fcc′ and ultimate strain εcc), has not been captured efficiently by existing stress-strain models yet. In order to improve the predicting accuracy of ultimate condition of FRP-confined cylinders, both a new strength model and a novel ultimate strain model with better performance are built via fitting extensive database (418 test points). Subsequently, based on the effective prediction of ultimate condition, a design stress-strain model with two-stage response is proposed and compared with some earlier models. The comparison between the proposed model and existing stress-strain models shows that the new model can effectively capture properties such as fcc′, εcc, as well as axial stress-strain relationship of concrete cylinders with various sizes which are confined with different external thickness of FRP composites.

Keywords: fiber reinforced polymer; concrete cylinder; strength model; ultimate strain model; stress-strain model

作者简介： 梁猛，博士，高级工程师，Email:764155562@qq.com。