嵌入式BFRP筋與外包BFRP布組合加固鋼筋混凝土方柱性能研究*
吳剛，姚劉鎮(zhèn)，楊慎銀，丁里寧，吳智深
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吳剛，姚劉鎮(zhèn)，楊慎銀，丁里寧，吳智深（東南大學(xué)土木工程學(xué)院， 南京 210096）［摘要］提出了嵌入式BFRP筋與外包BFRP布組合加固鋼筋混凝土(RC)方柱的方法，為驗證其有效性，完成了包括1根對比柱在內(nèi)的4根RC柱的低周反復(fù)荷載試驗，分析了各柱的破壞模式、承載力、延性和滯回特征。試驗結(jié)果表明復(fù)合加固效果顯著，相對于單獨使用一種加固方法的試件，其承載力和延性顯著提高，且存在明顯的復(fù)合效應(yīng)。在試驗基礎(chǔ)上，給出了復(fù)合加固時BFRP筋強度的取值及承載力計算方法和簡化設(shè)計方法，可指導(dǎo)實際工程。［關(guān)鍵詞］嵌入BFRP筋法； 外包BFRP布法； 復(fù)合加固； 承載力計算中圖分類號：TU375.3 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2013)19-0010-05Seismic behavior of square RC columns strengthened by near-surface-mounted BFRP bars and BFRP sheets jacketingWu Gang, Yao Liuzhen, Yang Shenyin, Ding Lining, Wu Zhishen(School of Civil Engineering, Southeast University, Nanjing 210096, China)Abstract: A new strengthening technique combining near-surface-mounted (NSM) basalt fiber reinforced polymer (BFRP) bars with BFRP sheets jacketing to strengthen square reinforced concrete (RC) columns was proposed. A total of four RC columns including one control specimen were tested under low cyclic loading to examine the effectiveness of this hybrid technique. The experimental results including the failure modes, bearing capacity, ductility and the hysteretic properties of the specimens were analyzed. The results show that hybrid strengthening techniques is effective with increase of strength and ductility due to the hybrid effects. Based on the experimental results, the strength of the BFRP bars in strengthening technique were provided. Furthermore, a simplified design method was proposed for reference.Keywords: NSM BFRP bar; BFRP sheets jacketing; strengthening with hybrid technique; bearing capacity calculation*國家“十二五”科技支撐計劃（2011BAB03B09），交通部西部交通建設(shè)科技項目（201131816980），國家國際科技合作專項項目（2012DFG20510）。作者簡介：吳剛，博士，教授，博士生導(dǎo)師，Email: g.wu@seu.edu.cn。參考文獻(xiàn)［1］吳剛, 魏洋, 吳智深. 玄武巖纖維與碳纖維加固混凝土矩形柱抗震性能比較研究［J］. 工業(yè)建筑, 2007, 37(6): 14-18.［2］SAADATMANESH H, EHSANI M R, JIN L. Seismic strengthening of circular bridge pier models with fiber composites［J］. ACI Structural Journal, 1996, 93(6): 639-738.［3］魏洋,吳剛,吳智深,等.FRP強約束混凝土矩形柱應(yīng)力-應(yīng)變關(guān)系的研究［J］.建筑結(jié)構(gòu),2007,37(12):75-78.［4］DE LORENZIS L, TENG J G. Near-surface mounted FRP reinforcement: An emerging technique for strengthening structures［J］. Composites Part B: Engineering, 2007, 38(2): 119-143.［5］TENG J G, DE LORENZIS L, WANG B, et al. Debonding failures of RC beams strengthened with near surface mounted CFRP strips［J］. Journal of Composites for Construction, 2006, 10(2): 92-105.［6］ACI 440.3R—04. Guide test mthods for fiber-reinforced polymers (FRPs) for reinforcing or strengthening concrete structures［S］.American Concrete Institute,Detroit,2004.［7］GB 50608—2010 纖維增強復(fù)合材料建設(shè)工程應(yīng)用技術(shù)規(guī)范［S］.北京：中國計劃出版社，2011.［8］POPOVICS S. A numerical approach to the complete stress strain curve for concrete［J］. Cement and Concrete Research, 1978:3(5):583-99.［9］吳剛, 呂志濤. 纖維增強復(fù)合材料 (FRP) 約束混凝土矩形柱應(yīng)力-應(yīng)變關(guān)系的研究［J］. 建筑結(jié)構(gòu)學(xué)報, 2004, 25(3):99-106.
