Creep of Sandwich Panels with Longitudinal Reinforcement Ribs for Civil Engineering Applications: Experiments and Composite Creep Modeling
Publication: Journal of Composites for Construction
Volume 21, Issue 1
Abstract
Composite sandwich panels with reinforcement ribs or webs are being increasingly considered for structural applications in civil engineering. Such panels are prone to creep when subjected to significant permanent loads and therefore the effects of this phenomenon must be duly accounted for in their design. Data regarding the viscoelasticity of sandwich panels and their constituent materials is still scarce and often cannot be directly used for creep predictions in design practice. To address this issue, this paper presents the experimental assessment and the analytical modeling of the viscoelastic response of two types of sandwich panels, with and without reinforcement ribs. Panels comprising glass fiber–reinforced polymer (GFRP) faces, cores of polyurethane (PU) foam, and longitudinal GFRP ribs are considered. The ribs increased the flexural strength and stiffness of the panels by a factor of two, while providing a threefold reduction in their creep compliance. A composite creep modeling (CCM) approach is assessed, inputting independently determined viscoelastic properties of the individual materials into Timoshenko beam theory to estimate the creep response of the full-scale panels. The predicted and experimental creep curves presented good agreement for different load levels, attesting the CCM’s adequacy for the analysis of creep in sandwich panel design.
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Acknowledgments
The authors would like to acknowledge Fundação para a Ciência e a Tecnologia (FCT) (Research Grant No. PTDC/ECM/113041/2009) and CERIS for funding the research. The first author would also like to acknowledge FCT for the financial support through Ph.D. scholarship SFRH/BD/78584/2011. The support of the company Sika Portugal S.A. is also gratefully acknowledged. Finally, the authors wish to express their gratitude to the institute PIEP—Innovation in Polymer Engineering, and particularly Luís Oliveira, for the manufacturing of the sandwich panels.
References
Awad, Z. K., Aravinthan, T., and Zhuge, Y. (2012). “Investigation of the free vibration behaviour of an innovative GFRP sandwich floor panel.” Constr. Build. Mater., 37, 209–219.
Bottoni, M., Mazzotti, C., and Savoia, M. (2014). “Creep tests on GFRP pultruded specimens subjected to traction or shear.” Compos. Struct., 108, 514–523.
CEN (European Committee for Standardization). (2002a). “Eurocode 1: Actions on structures—Part 1-1: General actions—Densities, self-weight, imposed loads for buildings (EN 1991-1-1:2002).”, Brussels, Belgium.
CEN (European Committee for Standardization). (2002b). “Eurocode: Basis of structural design (EN 1990:2002).”, Brussels, Belgium.
CEN (European Committee for Standardization). (2014). “Fibre reinforced polymer structures: Scientific and technical report.” Brussels, Belgium.
Clarke, J. L., ed. (1996). Structural design of polymer composites: EUROCOMP Design code and handbook, European Structural Polymeric Composites Group, E&FN Spon, London.
CNR (National Research Council of Italy). (2008). “Guide for the design and construction of structures made of FRP pultruded elements.”, Advisory Committee on Technical Recommendations for Construction, Rome.
Correia, J. R., Garrido, M., Gonilha, J. A., Branco, F. A., and Reis, L. G. (2012). “GFRP sandwich panels with PU foam and PP honeycomb cores for civil engineering structural applications: Effects of introducing strengthening ribs.” Int. J. Struct. Integrity, 3(2), 127–147.
Davies, J. M. (2001). Lightweight sandwich construction, Blackwell Science, Oxford, U.K.
Durand, S., Billaudeau, E., Lubineau, G., and Chapelle, H. (2012). “Design analysis of GRP panels for the roof of the Haramain high speed railway Jeddah station.” Proc., 10th Int. Conf. on Sandwich Structures (ICSS-10), Univ. of Nantes, Nantes, France.
Fam, A., and Sharaf, T. (2010). “Flexural performance of sandwich panels comprising polyurethane core and GFRP skins and ribs of various configurations.” Compos. Struct., 92(12), 2927–2935.
Findley, W. N. (1960). “Mechanism and mechanics of creep of plastics and stress relaxation and combined stress creep of plastics, Rhode Island.” Division of Engineering, Brown Univ., Providence, RI.
Frostig, Y., Baruch, M., Vilanay, O., and Sheinman, I. (1992). “High-order theory for sandwich beam behavior with transversely flexible core.” J. Eng. Mech., 1026–1043.
Garrido, M. (2016). “Composite sandwich panel floors for building rehabilitation.” Ph.D. dissertation, Instituto Superior Técnico, Univ. of Lisbon, Lisbon, Portugal.
Garrido, M., Correia, J. R., and Branco, F. A. (2014a). “Flexural behaviour of GFRP sandwich panels.”, Instituto Superior Técnico, Univ. of Lisbon, Lisbon, Portugal.
Garrido, M., Correia, J. R., Branco, F. A., and Keller, T. (2014b). “Creep behaviour of sandwich panels with rigid polyurethane foam core and glass-fibre reinforced polymer faces: Experimental tests and analytical modelling.” J. Compos. Mater., 48(18), 2237–2249.
Garrido, M., Correia, J. R., and Keller, T. (2016). “Effect of service temperature on the flexural creep of vacuum infused GFRP laminates used in sandwich floor panels.” Composites Part B, 90, 160–171.
Garrido, M., Correia, J. R., Keller, T., and Branco, F. A. (2015). “Adhesively bonded connections between composite sandwich floor panels for building rehabilitation.” Compos. Struct., 134, 255–268.
Gonilha, J. A., Correia, J. R., and Branco, F. A. (2013). “Creep response of GFRP-concrete hybrid structures: Application to a footbridge prototype.” Composites Part B, 53, 193–206.
Guedes, R. M., ed. (2011). Creep and fatigue in polymer matrix composites, Woodhead Publishing, Cambridge, U.K.
Hamed, E., and Frostig, Y. (2015). “Geometrically nonlinear creep behavior of debonded sandwich panels with a compliant core.” J. Sandwich Struct. Mater., 18(1), 65–94.
Huang, J.-S., and Gibson, L. J. (1990). “Creep of sandwich beams with polymer foam cores.” J. Mater. Civ. Eng., 171–182.
Huang, J.-S., and Gibson, L. J. (1991). “Creep of polymer foams.” J. Mater. Sci., 26(3), 637–647.
Keller, T., Haas, C., and Vallée, T. (2008). “Structural concept, design and experimental verification of a GFRP sandwich roof structure.” J. Compos. Constr., 454–468.
Keller, T., Rothe, J., de Castro, J., and Osei-Antwi, M. (2014). “GFRP-balsa sandwich bridge deck: Concept, design, and experimental validation.” J. Compos. Constr., .
Mousa, M. A., and Uddin, N. (2011). “Flexural behavior of full-scale composite structural insulated floor panels.” Adv. Compos. Mater., 20(6), 547–567.
Ramezani, M., and Hamed, E. (2013). “Coupled thermo-mechanical creep behavior of sandwich beams– Modeling and analysis.” Eur. J. Mech. A/Solids, 42, 266–279.
Shenoi, R. A., Allen, H. G., and Clark, S. D. (1997). “Cyclic creep and creep-fatigue interaction in sandwich beams.” J. Strain Anal., 32(1), 1–18.
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Published In
Journal of Composites for Construction
Volume 21 • Issue 1 • February 2017
Copyright
©2016 American Society of Civil Engineers.
History
Received: Mar 16, 2016
Accepted: Jun 2, 2016
Published online: Jul 18, 2016
Discussion open until: Dec 18, 2016
Published in print: Feb 1, 2017
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