不同徑厚比下纖維-鋼復(fù)合管混凝土柱軸壓性能*
魏洋1，2，李國芬1，曹興1
- 摘 要
-
（1南京林業(yè)大學(xué)土木工程學(xué)院，南京 210037；2 江蘇省結(jié)構(gòu)工程重點實驗室，蘇州 215011）［摘要］對8個纖維-鋼復(fù)合管混凝土柱和4個對比鋼管混凝土柱進行了軸壓試驗研究。結(jié)果表明，在纖維斷裂前，由于受到外部纖維布的約束，纖維鋼復(fù)合管混凝土柱的鋼管局部屈曲得到了有效抑制，鋼管無局部屈曲現(xiàn)象，且內(nèi)部混凝土的橫向膨脹較對比柱減小，纖維-鋼復(fù)合管混凝土柱的應(yīng)力-縱向應(yīng)變關(guān)系曲線表現(xiàn)出了纖維與鋼復(fù)合約束的獨特效果，具有鋼管屈服后的二次剛度和纖維斷裂后顯著的殘余強度，隨著鋼管徑厚比的不同，纖維斷裂后的構(gòu)件承載力表現(xiàn)出輕微下降、恒定、輕微上升、顯著上升的不同趨勢。提出了纖維鋼復(fù)合管混凝土柱的軸壓承載力計算模型，模型計算結(jié)果與試驗結(jié)果顯示出較好的一致性。［關(guān)鍵詞］纖維復(fù)合材料（FRP）; 鋼管混凝土; 約束; 軸心受壓中圖分類號：TU375.3 文獻標識碼：A 文章編號：1002-848X(2014)21-0032-04Axial compressive behavior of concrete-filled FRP-steel composite tubular columns with different diameter-thickness ratiosWei Yang1,2, Li Guofen1, Cao Xing1(1 College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China; 2 Jiangsu Province Key Laboratory of Structure Engineering, Suzhou 215011, China)Abstract: Eight concrete-filled FRP-steel composite tubular columns and four control concrete-filled steel tubular columns were investigated under axial compression test. Test results show that local buckling of steel tubular is effectively suppressed and no local buckling phenomenon occurs prior to FRP rupture due to the confinement of external FRP jacket, moreover, lateral expansion of inner concrete decreases compared to that of the control column. Stress-strain curves of concrete-filled FRP-steel composite tubular columns exhibit an unique effect as a result of the hybrid of FRP and steel, which display a secondary stiffness after steel yielding and significant residual strength after FRP rupture. With different diameter-thickness ratios, the bearing capacity of concrete-filled FRP-steel composite tubular columns shows various trends, such as a slight descending, constant, slight ascending, or significant ascending. A model to predict the uxial compressive bearing capacity of concrete-filled FRP-steel composite tubular columns was presented, and the predicted values show good agreement with the test results.Keywords: fiber reinforced polymer (FRP); concrete-filled steel tube; confinement; axial compression*國家自然科學(xué)基金（51208262），江蘇省結(jié)構(gòu)工程重點實驗室資助課題（ZD1005），江蘇高校優(yōu)勢學(xué)科建設(shè)工程資助項目（PAPD），住房和城鄉(xiāng)建設(shè)部科學(xué)技術(shù)項目（2011-K2-9）。作者簡介：魏洋，博士，副教授，一級注冊結(jié)構(gòu)工程師，Email：wy78@njfu.edu.cn。參考文獻［1］ABED F, ALHAMAYDEH M, ABDALLA S. Experi-mental and numerical investigations of the compressive behavior of concrete filled steel tubes (CFSTs) ［J］. Journal of Constructional Steel Research, 2013，80 (1):429-439.［2］李志東，李偉政，袁立樸，等.京滬高鐵南京南站主站房結(jié)構(gòu)設(shè)計研究［J］.建筑結(jié)構(gòu)，2013，43(17)：21-32.［3］周健，丁生根，王洪軍，等.南京祿口國際機場T2航站樓結(jié)構(gòu)設(shè)計［J］.建筑結(jié)構(gòu)，2012，42(5)：110-114.［4］康洪震，錢稼茹.鋼管高強混凝土組合柱軸壓承載力試驗研究［J］.建筑結(jié)構(gòu)，2011，41(6)：64-67.［5］張衛(wèi)東，王振波，丁海軍.小徑厚比鋼管再生混凝土短柱軸壓性能研究［J］.建筑結(jié)構(gòu)，2012，42(12)：86-89.［6］MOHAMED H M, MASMOUDI R. Flexural strength and behavior of steel and FRPreinforced concrete-filled FRP tube beams ［J］. Engineering Structures, 2010,32(11):37893800.［7］ZAGHI A E, SAIIDI M S, MIRMIRAN A. Shake table response and analysis of a concrete-filled FRP tube bridge column ［J］. Composite Structures, 2012, 94(5):1564-1574.［8］OZBAKKALOGLU T. Behavior of square and rectangular ultra high-strength concretefilled FRP tubes under axial compression ［J］.Composites Part B: Engineering, 2013,54(11):97-111.［9］YOUM K S, CHO J Y, LEE Y H, et al. Seismic performance of modular columns made of concrete filled FRP tubes ［J］. Engineering Structures,2013,57(12):37-50.［1０］武萍，于峰.FRP約束鋼管混凝土柱應(yīng)力-應(yīng)變關(guān)系研究［J］.建筑結(jié)構(gòu)，2013，43(8)：89-91.［1１］陶忠，莊金平，于清.FRP約束鋼管混凝土軸壓構(gòu)件力學(xué)性能研究［J］．工業(yè)建筑，2005，35(9)：20-23.［1２］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研究［J］.土木工程學(xué)報，2005，38(10):44-48.［1３］MIRZA S A, LACROIX E A. Comparative strength analyses of concrete-encased steel composite columns ［J］. Journal of Structural Engineering, 2004, 130(12):1941-1953.
