FRP约束矩形混凝土柱应力-应变模型

于峰，武 萍(安徽工业大学建筑工程学院，马鞍山 243002)

［摘要］ FRP约束矩形混凝土柱可显著地提高混凝土的承载力和延性。通过对已有试验数据分析可知，FRP约束矩形混凝土柱的性能主要与混凝土的截面形状系数、约束效应系数和混凝土的强度有关。在试验研究和理论分析的基础上，提出了FRP约束矩形混凝土柱抗压强度和轴向极限应变的计算公式。并分别建立了带有强化段和软化段的应力-应变模型。该模型反映了FRP约束矩形混凝土柱的特点，考虑了各参数的影响。模型的计算值与大量的试验结果吻合较好。

［关键词］ FRP；抗压强度；轴向应变；应力-应变关系；矩形柱

中图分类号：TU528.572，TU323.1文献标识码：A文章编号：1002-848X(2011)01-0083-04

Stress-strain model of FRP-confined rectangular concrete column

Yu Feng, Wu Ping

(School of Construction Engineering, Anhui University of Technology, Maanshan 243002, China)

Abstract:The bearing capacity and ductility of rectangular concrete column wrapped with fiber reinforced polymer (FRP) can be greatly increased. According to the analysis of existing experimental data, it is well known that the behavior of FRP-confined rectangular concrete column are mainly related to the cross section coefficient of concrete, the confinement effect coefficient and the strength of concrete. Based on experimental study and theoretical analysis, the formulae for compressive strength and ultimate axial strain of FRP-confined rectangular concrete column were proposed, and the stress-strain models with strain-hardening components and strain-softening components were built. The model captures the main characteristics of FRP-confined concrete column, and the effects of every parameter on the stress-strain relationship are carefully considered. The predictions of the model agree well with test data.

Keywords:fiber reinforced polymer; compressive strength; axial strain; stress-strain relationship; rectangular column

*国家自然科学基金(51008001)，安徽省自然科学基金重点项目(KJ2010A046)。

作者简介：于峰，博士，副教授，Email：yufeng2007@126.com。

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