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FRP約束矩形混凝土柱應(yīng)力-應(yīng)變模型

于峰，武 萍(安徽工業(yè)大學(xué)建筑工程學(xué)院，馬鞍山 243002)

［摘要］ FRP約束矩形混凝土柱可顯著地提高混凝土的承載力和延性。通過對已有試驗(yàn)數(shù)據(jù)分析可知，F(xiàn)RP約束矩形混凝土柱的性能主要與混凝土的截面形狀系數(shù)、約束效應(yīng)系數(shù)和混凝土的強(qiáng)度有關(guān)。在試驗(yàn)研究和理論分析的基礎(chǔ)上，提出了FRP約束矩形混凝土柱抗壓強(qiáng)度和軸向極限應(yīng)變的計(jì)算公式。并分別建立了帶有強(qiáng)化段和軟化段的應(yīng)力-應(yīng)變模型。該模型反映了FRP約束矩形混凝土柱的特點(diǎn)，考慮了各參數(shù)的影響。模型的計(jì)算值與大量的試驗(yàn)結(jié)果吻合較好。

［關(guān)鍵詞］ FRP；抗壓強(qiáng)度；軸向應(yīng)變；應(yīng)力-應(yīng)變關(guān)系；矩形柱

中圖分類號：TU528.572，TU323.1文獻(xiàn)標(biāo)識碼：A文章編號：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

*國家自然科學(xué)基金(51008001)，安徽省自然科學(xué)基金重點(diǎn)項(xiàng)目(KJ2010A046)。

作者簡介：于峰，博士，副教授，Email：yufeng2007@126.com。

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