Engineering Transactions, 66, 1, pp. 79–91, 2018
10.24423/engtrans.855.2018

Issues of Thin-Walled Sigma Beams Strengthened by CFRP Tape in the Context of Experimental and Numerical Studies

Katarzyna RZESZUT
Poznan University of Technology
Poland

Ilona SZEWCZAK
Lublin University of Technology
Poland

Patryk RÓŻYŁO
Lublin University of Technology
Poland

In this paper, the results of laboratory tests and numerical analyses of thin-walled beams strengthened with carbon fiber reinforced polymer (CFRP) are presented. In particular, tensile tests of the steel and carbon fiber Sikar CarboDurr S tapes were conducted. Full scale laboratory tests included six sigma beams, each 140 mm high, 3 m long and with a wall thickness of 2.5 mm. The laboratory specimens were assumed as simply supported, single-span beams subjected to a uniformly distributed load. Four of the tested beams were reinforced with carbon fiber tapes, and the other two were not reinforced and were considered as reference beams. Numerical models of the considered beams were developed in the Abaqus program and subjected to validation and verification based on laboratory results. In the paper, special attention is paid to the evaluation of the possibility of increasing the critical load capacity while simultaneously limiting displacements of the beams by appropriate positioning of CFRP tape. The work completes with comparative analysis and conclusions.
Keywords: thin-walled beam; strengthened; CFRP tapes
Full Text: PDF
Copyright © Polish Academy of Sciences & Institute of Fundamental Technological Research (IPPT PAN).

References

Colombia P., Favaa G., Sonzogni L., Fatigue behavior of cracked steel beams reinforced by using CFRP materials, Procedia Engineering, 74: 388–391, 2014.

Silvestre N., Camotim D., Young B., On the use of the EC3 and AISI specifications to estimate the ultimate load of CFRP-strengthened cold-formed steel lipped channel columns, Thin-Walled Structures, 47(10): 1102–1111, 2009.

FRP International, The Official Newsletter of the International Institute for FRP in Construction, 1(2), 2014, http://iifc-hq.org/wp-content/uploads/2011/01/news vol1-issue2.pdf.

Ghareeb M.A., Khedr M., Sayed-Ahmed E.Y., CFRP strengthening of steel I-beam against local web buckling: a numerical analysis, Conference Paper, 5th International Conference on Structural Engineering, Mechanics & Computation, Cape Town, South Africa, 2013, doi: 10.1201/b15963-436.

Harries K.A., Peck A.J., Abraham E.J., Enhancing stability of structural steel sections using FRP, Thin-Walled Structures, 47(10): 1092–1101, 2009.

Liu H., Xiao Z., Zhao X.L., Al-Mahaidi R., Prediction of fatigue life for CFRPstrengthened steel plates, Thin-Walled Structures, 47(10): 1069–1077, 2009.

Liu Q., Yang J., Chan A.H.C., Li L.Y., Pseudo-plastic moment resistance of continuous beams with cold-formed sigma sections at internal supports: a numerical study, Thin-Walled Structures, 49 (12): 1592–1604, 2011, doi: 10.1016/j.tws.2011.08.007.

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): 514–522, 2001.

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): 195-205, March, 2005.

Pienko M., Robak A., Stand for examination of deformation of horizontal elements loaded uniformly [in Polish: Stanowisko do badania odkształcen elementów poziomych obciazonych równomiernie], Zgłoszenie nr (21) 410025, Biuletyn Urzedu Patentowego, 43(16): p. 34, 2015.

Rózyło P., Wrzesinska K., Numerical analysis of the behavior of compressed thin-walled elements with holes, Advances in Science and Technology Research Journal, 10(31): 199–206, 2016.

Rzeszut K., Szewczak I., Experimental studies of sigma thin-walled beams strengthen by CFRP tapes, International Journal of Civil, Environmental, Structural, Construction and Architectural Engineering, 11(7): 32–39, 2017.

Sayed-Ahmed E.Y., Numerical investigation into strengthening steel I-section beams using CFRP strips, Conference Paper, Structures Congress 2006, May 18–21, 2006, St. Louis, Missouri, United States, doi: 10.1061/40889(201)68.

Sayed-Ahmed E.Y., Strengthening of thin-walled steel I-section beams using CFRP strips, Advanced Composite Materials in Bridges and Structures, Conference Paper, 4th International Conference on Advanced Composite Materials in Bridges and Structures (ACMBS IV), Calgary, Alberta, Canada, 2004.

Szewczak I., Rzeszut K., Pilot experimental studies of thin-walled Sigma steel beams reinforced with CFRP tapes [in Polish: Pilotazowe badania eksperymentalne cienkosciennych belek stalowych typu sigma wzmocnionych tasmami CFRP], Materiały Budowlane, 531(11): 84–85, 2016.

Waszczyszyn Z., Cichon CZ., Radwanska M., Stability of structures by finite element methods: Volume 40, Elsevier Science B.V., 2013.

Zhao X.L., Al-Mahaidi R., Web buckling of lightsteel beams strengthened with CFRP subjected to end-bearing forces, Thin-Walled Structures, 47(10): 1029–1036, 2009.

Zienkiewicz O.C., Taylor R.L., The Finite Element Method, Volume 2: Solid Mechanics (5th Ed.), Butterworth-Heinemann, 2000.




DOI: 10.24423/engtrans.855.2018