Web Buckling in Pultruded Fiber-Reinforced Polymer Deep Beams Subjected to Concentrated Loads
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Abstract
Five 609.5-mm deep fiber-reinforced polymer (FRP) beams with a span-to-depth ratio of were tested in three-point bending with the beam ends constrained to prevent global failure. A concentrated load was applied at midspan either directly to the top flange or through a 101.6 mm wide by 12.7-mm thick FRP bearing plate resting on the top flange. VIC-3D Digital Image Correlation Measurement Software from Correlated Solutions captured out-of-plane displacement of the webs, and Southwell plots were generated to determine buckling loads. Each specimen experienced a stability failure of the web before undergoing material failure in the upper web-flange junction. On average, web buckling occurred at 90% of the ultimate load. The introduction of a bearing plate did not significantly affect the buckling load or ultimate capacity of the specimens. One specimen was tested into the postbuckling range, unloaded, and reloaded to material failure and experienced no loss of strength or stiffness. Another specimen with significant damage to the unloaded web-flange junction was tested and compared with a virgin sample. The damaged sample experienced no significant loss of strength or stiffness. Comparisons of experimental data with three theoretical equations for web-buckling capacity of FRP beams are provided.
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Acknowledgments
The authors would like to acknowledge Strongwell for the generous donation of materials as well as Paul Moy and his staff at the RMRL.
References
ASCE. (1984). Structural plastics design manual, New York, 728.
ASCE. (2011). Pre-standard for load and resistance factor design (LRFD) of pultruded fiber reinforced polymer (FRP) structures, 〈http://www.acmanet.org/resources/lrfd.cfm〉.
ASTM D7290. Standard practice for evaluating material property characteristic values for polymetric composites for civil engineering structural applications.
Bank, L. C. (2006). Composites for construction: Structural design with FRP materials, Wiley, New Jersey, 414–415.
Bank, L. C., Nadipelli, M., and Gentry, T. R. (1994). “Local buckling and failure of pultruded fiber-reinforced plastic beams.” J. Eng. Mater. Technol., 116, 233–237.
Basler, K. (1961). “New provisions for plate girder design.” Proc., AISC National Engineering Conf., AISC, Minneapolis, 65–74.
Borowicz, D. (2010). “An investigation into the behavior of fiber-reinforced polymer (FRP) beams subjected to concentrated loads in the plane of the web.” Doctoral dissertation, Univ. of Wisconsin-Madison, Madison, WI.
Borowicz, D., and Bank, L. C. (2011). “Behavior of pultruded fiber-reinforced polymer beams subjected to concentrated loads in the plane of the web.” J. Compos. Constr., 229–238.
D’Alessandro, R. (2009). “Characteristic values of mechanical properties of wide-flange pultruded FRF beams.” Master’s thesis, Univ. of Wisconsin-Madison, Madison, WI.
Elgaaly, M. (1983). “Web design under compressive edge loads.” Eng. J., 20(4), 153–171.
Galambos, T. V. (1998). Guide to stability design criteria for metal structures, 5th Ed., John Wiley, New York.
Gere, J., and Timoshenko, S. (1990). Mechanics of material, PWS-Kent Publishing, Boston.
Ko, W. L. (1987). “Accuracies of Southwell and force/stiffness methods in the prediction of buckling strength of hypersonic aircraft wing tubular panels.” National Aeronautics and Space Administration (NASA) Technical Memorandum 88295, Ames Research Center, Edwards, CA.
Kollar, L. P., and Springer, G. (2003). Mechanics of composite structures, Cambridge University Press, New York, 136.
Nadipelli, M. (1994). “Experimental investigation of local buckling and failure of pultruded fiber reinforced plastic beams.” Master’s thesis, Catholic Univ. of America, Washington DC.
Southwell, R. V. (1931). “On the analysis of experimental observations in problems of elastic stability.” Proc. R. Soc. London, Ser. A, 135(828), 601–616.
Strongwell. (2002). 2002 design guide, Bristol, VA 〈http://www.strongwell.com/〉 (Feb. 01, 2008).
Tarján, G., Sapkás, A., and Kollár, L. P. (2009). “Local web buckling of composite (FRP) beams.” Proc., 17th Int. Conf. Compos. Mater., Edinburgh, Scotland.
Tarján, G., Sapkás, A., and Kollár, L. P. (2010). “Local web buckling of composite (FRP) beams.” J. Reinf. Plast. Compos., 29(10), 1451–1462.
Vanevenhoven, L. M., Shield, C. K., and Bank, L. C. (2009). “LRFD factors for pultruded wide-flange columns.” J. Struct. Eng., 136(5), 554–564.
Whitney, J., and Browning, C. (1985). “On short-beam shear tests for composite materials.” Exp. Mech., 25(3), 294–300.
Xie, M., Chapman, J., and Hobbs, R. (2008). “A rational design model for transverse web stiffeners.” J. Constr. Steel Res., 64(9), 928–946.
Yoon, S. J., Jung, J. H., and Jang, W. S. (2004). “Elastic web buckling strength of pultruded flexural members.” Key Eng. Mater., 261–263(1–2), 621–626.
Zureick, A., Kahn, L., and Bandy, B. (1995). “Tests on deep I-shape pultruded beams.” J. Reinf. Plast. Compos., 14(4), 378–389.
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Journal of Composites for Construction
Volume 18 • Issue 3 • June 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Sep 11, 2012
Accepted: Jan 9, 2013
Published online: Jan 11, 2013
Discussion open until: May 30, 2014
Published in print: Jun 1, 2014
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