嵌入式BFRP筋与外包BFRP布组合加固钢筋混凝土方柱性能研究*
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吴刚，姚刘镇，杨慎银，丁里宁，吴智深（东南大学土木工程学院， 南京 210096）［摘要］提出了嵌入式BFRP筋与外包BFRP布组合加固钢筋混凝土(RC)方柱的方法，为验证其有效性，完成了包括1根对比柱在内的4根RC柱的低周反复荷载试验，分析了各柱的破坏模式、承载力、延性和滞回特征。试验结果表明复合加固效果显著，相对于单独使用一种加固方法的试件，其承载力和延性显著提高，且存在明显的复合效应。在试验基础上，给出了复合加固时BFRP筋强度的取值及承载力计算方法和简化设计方法，可指导实际工程。［关键词］嵌入BFRP筋法； 外包BFRP布法； 复合加固； 承载力计算中图分类号：TU375.3 文献标识码：A 文章编号：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*国家“十二五”科技支撑计划（2011BAB03B09），交通部西部交通建设科技项目（201131816980），国家国际科技合作专项项目（2012DFG20510）。作者简介：吴刚，博士，教授，博士生导师，Email: g.wu@seu.edu.cn。参考文献［1］吴刚, 魏洋, 吴智深. 玄武岩纤维与碳纤维加固混凝土矩形柱抗震性能比较研究［J］. 工业建筑, 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,吴刚,吴智深,等.FRP强约束混凝土矩形柱应力-应变关系的研究［J］.建筑结构,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 纤维增强复合材料建设工程应用技术规范［S］.北京：中国计划出版社，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］吴刚, 吕志涛. 纤维增强复合材料 (FRP) 约束混凝土矩形柱应力-应变关系的研究［J］. 建筑结构学报, 2004, 25(3):99-106.
