Debonding Mitigation of CFRP-Strengthened Steel Beams with Silyl-Modified Polymer and CFRP Wrap Anchorage

被引:1
作者
Kim, Yail J. [1 ]
Siriwardanage, Thushara [1 ]
Kang, Jae-Yoon [2 ]
机构
[1] Univ Colorado, Dept Civil Engn, Denver, CO 80217 USA
[2] Korea Inst Construct Technol, Struct Engn Res Div, SOC Res Inst, Gyeonggi 411712, South Korea
关键词
Damage; Fiber reinforced polymer; Interfaces; Rehabilitation; Steel; RC BEAMS; SHEETS; CONCRETE; REPAIR; ADHESIVES; SYSTEMS; PLATES;
D O I
10.1061/(ASCE)CC.1943-5614.0000480
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This paper presents an innovative strengthening methodology for damaged steel beams with carbon-fiber-reinforced polymer (CFRP) sheets. Emphasis is placed on controlling premature CFRP debonding using an emerging material called silyl-modified polymer (SMP) in conjunction with its hybrid bond application with a conventional epoxy adhesive. The hypothesis proposed is that the low-modulus SMP addresses stress singularity along the CFRP-steel interface, while the high-modulus epoxy preserves interfacial capacity. CFRP anchorage assists the efficacy of such a hybrid bond configuration. A two-phase experimental program is conducted to evaluate the performance of various CFRP-strengthening schemes, including element-and structural-level investigations (i.e., interface and beam tests, respectively). Test results reveal that the SMP bond mitigates CFRP debonding that is commonly observed in epoxy bond. The strengthening systems employed significantly improve the flexural behavior of the test beams in terms of ductility and failure characteristics. (C) 2014 American Society of Civil Engineers.
引用
收藏
页数:13
相关论文
共 24 条
[1]  
American National Standards Institute (ANSI), 2007, 52451 DIN
[2]  
[Anonymous], 2008, Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures
[3]  
BASF, 2007, MBRAC CF 130 UN HIGH
[4]  
Bizindavyi L., 1999, J COMPOS CONSTR, V3, P153, DOI 10.1061/(ASCE)1090-0268(1999)3:4(153)
[5]  
Bostik, 2011, BOSTIK 70 03A DATA S
[6]   Fracture energy for repaired cracks with bonded composite patch having two adhesive bands in aircraft structures [J].
Bouiadjra, B. Bachir ;
Fekirini, H. ;
Belhouari, M. ;
Boutabout, B. ;
Serier, B. .
COMPUTATIONAL MATERIALS SCIENCE, 2007, 40 (01) :20-26
[7]   Joint strength optimization by the mixed-adhesive technique [J].
da Silva, Lucas F. M. ;
Lopes, Maria Joao C. Q. .
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES, 2009, 29 (05) :509-514
[8]   Mechanical characterization of adhesive joints with dissimilar substrates for marine applications [J].
Di Bella, G. ;
Galtieri, G. ;
Pollicino, E. ;
Borsellino, C. .
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES, 2013, 41 :33-40
[9]   Variable modulus adhesives: an approach to optimised joint performance [J].
Fitton, MD ;
Broughton, IG .
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES, 2005, 25 (04) :329-336
[10]   Flexural Performance of Steel Girders Retrofitted Using CFRP Materials [J].
Galal, K. ;
ElDin, H. M. Seif ;
Tirca, L. .
JOURNAL OF COMPOSITES FOR CONSTRUCTION, 2012, 16 (03) :265-276