FRP-Confined Clay Brick Masonry Assemblages under Axial Compression: Experimental and Analytical Investigations
Publication: Journal of Composites for Construction
Volume 19, Issue 4
Abstract
Unreinforced masonry (URM) structures that are in need of repair and rehabilitation constitute a significant portion of building stock worldwide. The successful application of fiber-reinforced polymers (FRP) for repair and retrofitting of reinforced-concrete (RC) structures has opened new avenues for strengthening URM structures with FRP materials. The present study analyzes the behavior of FRP-confined masonry prisms under monotonic axial compression. Masonry comprising of burnt clay bricks and cement—sand mortar (generally adopted in the Indian subcontinent) having ratio less than one is employed in the study. The parameters considered in the study are, (1) masonry bonding pattern, (2) inclination of loading axis to the bed joint, (3) type of FRP (carbon FRP or glass FRP), and (4) grade of FRP fabric. The performance of FRP-confined masonry prisms is compared with unconfined masonry prisms in terms of compressive strength, modulus of elasticity and stress-strain response. The results showed an enhancement in compressive strength, modulus of elasticity, strain at peak stress, and ultimate strain for FRP-confined masonry prisms. The FRP confinement of masonry resulted in reducing the influence of the inclination of the loading axis to the bed joint on the compressive strength and failure pattern. Various analytical models available in the literature for the prediction of compressive strength of FRP-confined masonry are assessed. New coefficients are generated for the analytical model by appending experimental results of the current study with data available in the literature.
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Acknowledgments
The research investigations carried out in this paper were funded by CiSTUP, IISc, Bangalore through project No. CIST 0036, and the authors would like to gratefully acknowledge the support extended by the donor institution.
References
Aiello, M. A., Micelli, F., and Valente, L. (2007). “Structural upgrading of masonry columns by using composite reinforcements.” J. Compos. Constr., 650–658.
Aiello, M. A., Micelli, F., and Valente, L. (2009). “FRP confinement of square masonry columns.” J. Compos. Constr., 148–158.
ASTM. (2000). “Standard test method for tensile properties of polymer matrix composite materials.” D3039/D3039M, West Conshohocken, PA.
ASTM. (2009). “Standard test methods for sampling and testing brick and structural clay tile.” C67-09, West Conshohocken, PA.
Atul India. (2014). 〈http://www.atul.co.in/〉.
British Standards Institution (BSI). (1980). “British standard methods of testing mortars, screeds and plasters.” 4551, London, U.K.
Bureau of Indian Standards (BIS). (2002). “Code of practice for structural use of unreinforced masonry.” 1905–1987, New Delhi, India.
Coburn, A., and Spence, R. (2002). Earthquake protection, Wiley, West Sussex, U.K.
Consiglo Nazionale delle Ricerche (CNR). (2004). “Guide for the design and construction of externally bonded FRP systems for strengthening existing structures.”, Italian National Research Council, Rome.
Corradi, M., Grazini, A., and Borri, A. (2007). “Confinement of brick masonry columns with CFRP materials.” Compos. Sci. Technol., 67(9), 1772–1783.
Di Ludovico, M. D., Ambra, C., Prota, A., and Manfredi, G. (2010). “FRP confinement of tuff and clay brick columns: Experimental study and assessment of analytical models.” J. Compos. Constr., 583–596.
Duxson, P., Jimenez, F. A., Provis, J. L., Luckey, G. C., Palomo, A., and Deventer, J. S. J. (2007). “Geopolymer technology: The current state of the art.” J. Mater. Sci., 42(9), 2917–2933.
El-Dakhakhni, W. W., Elgaaly, M., and Hamid, A. A. (2003). “Three-strut model for concrete masonry-infilled steel frames.” J. Struct. Eng., 177–185.
Hamid, A. A., El-Dakhakhni, W. W., Hakam, Z. H., and Elgaaly, M. (2005). “Behavior of composite unreinforced masonry–fiber-reinforced polymer wall assemblages under in-plane loading.” J. Compos. Constr., 73–83.
Krevaikas, T. D., and Triantafillou, T. C. (2005). “Masonry confinement with fiber-reinforced polymers.” J. Compos. Constr., 128–135.
Lam, L., and Teng, J. G. (2001). “A new stress-strain model for FRP-confined concrete.” Proc., Int. Conf. on FRP Composites in Civil Engineering, Elsevier, New York, 283–292.
Lignola, G. P., Andrea, P., and Manfredi, G. (2014). “Simplified modeling of rectangular concrete cross-sections confined by external FRP wrapping.” Polymers, 6(4), 1187–1206.
Mander, J. B., Priestley, M. N., and Park, R. (1988a). “Observed stress-strain model for confined concrete.” J. Struct. Div., 1827–1849.
Mander, J. B., Priestley, M. N., and Park, R. (1988b). “Theoretical stress-strain model for confined concrete.” J. Struct. Div., 1804–1826.
MATLAB [Computer software]. Natick, MA, MathWorks.
Nigro, E., Paciello, S., and Faella, C. (2004). “Sperimentazione sul confinamento con FRP di pilastrini in muratura di pietra naturale ed artificiale [experimental study on FRP-confined masonry columns made of natural and artificial stone].” Proc., 12th National Congress ANIDIS, The Seismic Engineering in Italy, ANIDIS, Rome.
Suriya Prakash, S., and Alagusundaramoorthy, P. (2008). “Load resistance of masonry wallettes and shear triplets retrofitted with GFRP composites.” Cem. Concr. Compos., 30(8), 745–761.
Toutanji, H. A. (1999). “Stress-strain characteristics of concrete columns externally confined with advanced fiber composite sheets.” ACI Mater. J., 96(3), 397–404.
Tumialan, G., Vatovec, M., and Kelley, P. L. (2009). “FRP composites for masonry retrofitting.” Struct. Mag., 12–14.
Venkatarama Reddy, B. V., and Uday, V. (2008). “Influence of shear bond strength on compressive strength and stress-strain characteristics of masonry.” Mater. Struct. (RILEM), 41(10), 1697–1712.
Youssef, M. N., Feng, M. Q., and Mosallam, A. S. (2007). “Stress-strain model for concrete confined by FRP composites.” Compos. Part B, 38(5–6), 614–628.
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Published In
Journal of Composites for Construction
Volume 19 • Issue 4 • August 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Feb 13, 2014
Accepted: Jul 30, 2014
Published online: Sep 29, 2014
Discussion open until: Feb 28, 2015
Published in print: Aug 1, 2015
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