FRP約束鋼管混凝土柱應(yīng)力-應(yīng)變關(guān)系研究*
武萍，于峰
- 摘 要
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武萍，于峰（安徽工業(yè)大學(xué)建筑工程學(xué)院， 馬鞍山 243002）［摘要］確定FRP約束鋼管混凝土柱的應(yīng)力-應(yīng)變關(guān)系是研究其力學(xué)性能的關(guān)鍵。根據(jù)彈性理論，引入等效約束效應(yīng)系數(shù)，分別提出FRP約束鋼管混凝柱的承載力和峰值應(yīng)變的計(jì)算公式。在此基礎(chǔ)上，建立了FRP約束鋼管混凝土柱的應(yīng)力-應(yīng)變關(guān)系模型，該模型可分為三個(gè)階段：彈性階段、強(qiáng)化段和下降段。該模型較好地反映了FRP約束鋼管混凝土柱應(yīng)力-應(yīng)變關(guān)系的特點(diǎn)，考慮了各因素對(duì)FRP約束鋼管混凝土柱力學(xué)性能的影響。模型的計(jì)算值與試驗(yàn)結(jié)果吻合較好。［關(guān)鍵詞］FRP；鋼管混凝土；應(yīng)力-應(yīng)變關(guān)系；承載力中圖分類號(hào)：TU375, TU528 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2013)08-0089-03Study on stress-strain relationship of concrete filled steel tubes confined with FRPWu Ping, Yu Feng（School of Civil Engineering, Anhui University of Technology, Ma′anshan 243002, China)Abstract: The determination of stress-strain relationship of concrete filled steel tubes confined with FRP is the key to study the mechanical behavior of confined concrete. According to the elastic theory,the equivalent confinement effect coefficient was introduced,the calculating formulae of the bearing capacity and the peak strain of concrete filled steel tubes confined with FRP were proposed.Then the stress-strain relationship model of concrete filled steel tubes confined with FRP was established,the model may be divided into three portions:the elastic stage,the strengthening stage and the descending stage.The model reflects the main characteristics of stress-strain relationship of concrete filled steel tubes confined with FRP,the effect of each factor on the mechanical behavior is well considered.The predictions of the model agree well with test data.Keywords: fiber reinforced polymer; concrete filled steel tube; stress-strain relationship; bearing capacity*國家自然科學(xué)基金（51008001），安徽省自然科學(xué)基金（1208085QE88），住房和城鄉(xiāng)建設(shè)部科學(xué)技術(shù)項(xiàng)目（2012-K2-7)。通訊作者：于峰，博士，教授，Email:yufeng2007@126.com。參考文獻(xiàn)［1］韓林海，陶忠，王文達(dá)，等. 現(xiàn)代組合結(jié)構(gòu)與混合結(jié)構(gòu)：試驗(yàn)、理論和方法［M］. 北京：科學(xué)出版社，2009.［2］丁發(fā)興，應(yīng)小勇，余志武，等. 圓鋼管輕骨料混凝土軸壓短柱的力學(xué)性能分析［J］. 深圳大學(xué)學(xué)報(bào)，2011，28（3）：207-212.［3］WEI YOUYI, WU YUFEI. Unified stress-strain model of concrete for FRP-confined columns［J］. Construction and Building Materials, 2012, 26(1): 381-392.［4］于峰，牛荻濤.軸心受壓FRP約束混凝土圓柱應(yīng)力-應(yīng)變模型［J］.哈爾濱工業(yè)大學(xué)學(xué)報(bào)，2009，41（10）：214-216.［5］MOHAMED H H.Axial stress-strain relationship for FRP confined circular and rectangular concrete columns［J］.Cement and Concrete Composites,2006,28(10):938-948.［6］KAZUNORI FUJIKAKE, SIDNEY MINDESS, XU HANFENG. Analytical model for concrete confined with fiber reinforced polymer composite［J］. Journal of Composites for Construction, 2004, 8(4): 341-351.［7］MARWAN N YOUSSEF, MARIA Q FENG, AYMAN S MOSALLAM. Stress-strain model for concrete confined by FRP composites［J］. Composites: Part B Engineering, 2007, 38(56): 614-628.［8］于峰. PVC-FRP管混凝土柱力學(xué)性能的試驗(yàn)研究與理論分析［D］. 西安：西安建筑科技大學(xué)，2007.［9］于峰，牛荻濤，賀拴海. 纖維復(fù)合材料約束混凝土柱統(tǒng)一強(qiáng)度模型［J］. 長安大學(xué)學(xué)報(bào)，2010，30（2）：70-74.［10］YU FENG,NIU DITAO.Unified bearing capacity model of confined concrete column subjected to axial compression［J］. Journal of Harbin Institute of Technology, 2009, 16(5): 99-104.［11］王慶利，顧威，趙穎華. CFRP-鋼復(fù)合圓管內(nèi)填混凝土軸壓短柱試驗(yàn)研究［J］. 土木工程學(xué)報(bào)，2005，38（10）：44-48.［12］陶忠，于清. 新型組合結(jié)構(gòu)柱——試驗(yàn)、理論與方法［M］.北京：科學(xué)出版社，2006.［13］蔡紹懷. 現(xiàn)代鋼管混凝土結(jié)構(gòu)［M］. 北京：人民交通出版社，2003.
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