Roads and Bridges - Drogi i Mosty
16, 2, 2017, 85-99

Strengthening of steel structures with CFRP strips

Maciej Kowal Mail
Lublin University of Technology, Civil Engineering and Architecture Faculty, 40 Nadbystrzycka Street, 20-618 Lublin
Marek Łagoda Mail
Road and Bridge Research Institute, 1 Instytutowa Street, 03-302 Warsaw
Published: 2017-06-30

Abstract

The paper presents the results of research on the suitability of externally bonded composite strips of carbon fibre-reinforced polymer (CFRP) for post-strengthening of steel structures. Specimens with the strips applied on both sides (double cover joints) were prepared and subjected to axial tension tests to find which of the eight different configurations of end detailing provides the strongest bond. The strengthening effect of externally bonded composite strips was tested on sixteen steel I-beams, including determination of the effective bond length and the effects of the thickness of adhesive layer and modulus of the CFRP strip on the load capacity of the steel-adhesive-CFRP strip assembly. The research showed that externally adhered CFRP strips can increase the bending strength of steel structures (an 8% increase was obtained in the experiments) and the shape of spew fillet can have a significant influence on the strength of the strengthened system (the difference reaching up to 57%).

Keywords


end detailing, FRP composites, steel structures, strengthening

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References


Guidelines for the design and construction of externally bonded FRP systems for strengthening existing structures. CNR-DT 202/2005, June 2007, CNR, Rome, Italy

Luke S.: Strengthening structures with carbon fibre plates case histories for Hythe bridge, Oxford and Qafco Prill tower, Qatar. NGCC first annual conference and AGM - Composites in construction, through life performance, Watford, UK, 2001

Luke S.: The use of carbon fibre plates for the strengthening of two metallic bridges of an historic nature in the UK. International Conference on FRP Composites in Civil Engineering, vol. 2, Hong Kong, China, 2002, 975-983

Moy S.S.J., Bloodworth A.G.: Strengthening a Steel Bridge with CFRP Composites. ICE Proceedings - Structures and Buildings, 160, 2, 2007, 81-93

Farmer N., Smith I.: King Street Railway Bridge - Strengthening of cast iron girders with FRP composites. 9 International Conference on Structural Faults and Repairs, London, UK, 2001

Harries K.A.: FRP International – the official newsletter of the International Institute for FRP in Construction, 8, 3, July 2011 - website version, 17.11.2014

Canning L., Farmer N., Luke S., Smith I.: Recent Developments in Strengthening Technology and the strengthening/reconstruction decision. Conference on Railway Bridges Today and Tomorrow, Bristol, UK, 2006, 107-113

Łagoda G., Łagoda M.: Strengthening steel bridge across Vistula River in Poland. 33 IABSE Symposium, Sustainable Infrastructure Environment Friendly, Safe and Resource Efficient, vol. 96, Bangkok, Thailand, 2009

Tsai M.Y., Morton J.: The effect of a spew fillet on adhesive stress distributions inlaminated composite single-lap joints. Composite Structures, 32, 1995, 123-131

Lang T.P., Mallick P.K.: Effect of spew geometry on stresses in single lap adhesive joints. International Journal of Adhesion & Adhesives, 18, 3, 1998, 167-177

Stratford T.J., Chen J.F.: Designing for tapers and defects in FRP-strengthened metallic structures. Proceedings of the International Symposium on Bond Behaviour of FRP in Structures, Hong Kong, 2005, 453-458

Valle’e T., Keller T.: Adhesively bonded lap joints from pultuded GFRP profiles. Part 3 – effects of chamfers. Composites: Part B Engineering, 37, 2006, 328-336

Deng J., Lee M.M.K.: Effect of plate end and adhesive spew geometries on stresses in retrofitted beams bonded with a CFRP plate. Composites: Part B Engineering, 39, 4, 2008, 731-739

Haghani R., Al-Emrani M., Kliger R.: Interfacial stress analysis of geometrically modified adhesive joints in steel beams strengthened with FRP laminates. Construction and Building Materials, 23, 3, 2009, 1413-1422

Łagoda M., Kowal M.: Wpływ kształtu zakończenia skleiny na wytrzymałość złącza stal-kompozyt FRP. Budownictwo i Architektura, 12, 2, 2013, 39-46

Łagoda M., Kowal M.: Wzmacnianie płaskich, zginanych elementów stalowych materiałami kompozytowymi FRP. Budownictwo i Architektura, 13, 2, 2014, 257-264

Miller T.C., Chajes M.J., Mertz D.R., Hastings J.N.: Strengthening of a steel bridge girder using CFRP plates. ASCE Journal of Bridge Engineering, 6, 6, 2001, 514-522

Jiao H., Zhao X.L.: CFRP strengthened butt-welded very high strength (VHS) circular steel tubes. Thin-Walled Structures, 42, 7, 2004, 963-978

Nozaka K., Shield C.K., Hajjar J.F.: Effective bond length of carbon-fiber-reinforced polymer strips bonded to fatigued steel bridge I-girders. ASCE Journal of Bridge Engineering, 10, 2, 2005, 195-205

Smith S.T., Teng J.G.: Interfacial stresses in plated beams. Engineering Structures, 23, 7, 2001, 857-871


Strengthening of steel structures with CFRP strips

  
Kowal, Maciej; Łagoda, Marek. Strengthening of steel structures with CFRP strips. Roads and Bridges - Drogi i Mosty, [S.l.], v. 16, n. 2, p. 85-99, jun. 2017. ISSN 2449-769X. Available at: <>. Date accessed: 29 Mar. 2024. doi:http://dx.doi.org/10.7409/rabdim.017.006.