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(1 哈爾濱工業(yè)大學(xué)， 哈爾濱 150001; 2 山東省建筑科學(xué)研究院， 濟(jì)南 250031)

［摘要］近年來(lái),已有不少纖維增強(qiáng)復(fù)合材料(Fiber reinforced polymer，簡(jiǎn)稱(chēng)FRP)約束混凝土圓柱的應(yīng)力-應(yīng)變關(guān)系模型，然而有學(xué)者指出，現(xiàn)有模型較難得到預(yù)測(cè)誤差分別小于14%和35%的抗壓強(qiáng)度模型和極限應(yīng)變模型，因此FRP混凝土圓柱應(yīng)力-應(yīng)變關(guān)系的極限狀態(tài)(即抗壓強(qiáng)度f(wàn)cc′和極限應(yīng)變εcc)尚未得到較準(zhǔn)確地預(yù)測(cè)。本文建立在較大數(shù)據(jù)庫(kù)(418個(gè)試驗(yàn)數(shù)據(jù))基礎(chǔ)上，回歸得到精度較高的強(qiáng)度模型和極限應(yīng)變模型，進(jìn)而得出預(yù)測(cè)趨勢(shì)較好的兩段式應(yīng)力-應(yīng)變關(guān)系模型，通過(guò)與現(xiàn)有模型的比較，本文模型能夠?qū)Σ煌叽绾筒煌s束水平的FRP約束混凝土圓柱的強(qiáng)度、極限應(yīng)變和應(yīng)力-應(yīng)變關(guān)系做出較滿意的預(yù)測(cè)。

［關(guān)鍵詞］Fiber reinforced polymer； 混凝土圓柱； 強(qiáng)度模型； 極限應(yīng)變模型； 應(yīng)力-應(yīng)變關(guān)系模型

中圖分類(lèi)號(hào)： TU375.3 文獻(xiàn)標(biāo)識(shí)碼： A文章編號(hào)：  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

作者簡(jiǎn)介： 梁猛，博士，高級(jí)工程師，Email:764155562@qq.com。