In-Plane Performance of Unreinforced Concrete Masonry Strengthened with Prestressed GFRP Bars
Publication: Journal of Composites for Construction
Volume 21, Issue 1
Abstract
This research investigates the feasibility of using prestressed glass fiber reinforced polymer (GFRP) bars for enhancing the in-plane shear strength of unreinforced masonry (URM) walls. In this application, URM walls were strengthened with prestressed GFRP bars by using the near-surface mounted reinforcement (NSM) technique. Prestressed GFRP bars would be used for repointing/closing wide open cracks in existing masonry structures. In total, eight URM walls were tested under in-plane diagonal compression. Experimental results validated the higher shear capacity of the strengthened URM walls and this increase was more pronounced for walls strengthened with prestressed GFRP bars. Furthermore, the calculated drift ratio in strengthened walls was considerably higher when failure was along stair-stepped diagonal cracks. Experimental results were used to modify and calibrate a theoretical shear friction model for predicting the in-plane shear capacity of strengthened URM walls with NSM prestressed GFRP bars. The model was capable of predicting reasonably well the shear capacity of strengthened URM walls.
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References
ACI (American Concrete Institute). (2015). “Guide for the design and construction of structural concrete reinforced with fiber-reinforced polymer (FRP) bars.” ACI440.1R-15, Farmington Hills, MI, 88.
ASTM. (2014). “Standard specification for mortar for unit masonry.” ASTM C270-14A, West Conshohocken, PA.
Crisafulli, F. J., Carr, A. J., and Park, R. (1995). “Shear strength of unreinforced masonry panels.” Pacific Conf. Earthquake Eng., Australia, 77–86.
De Lorenzis, L., Nanni, A., and La Tegola, A. (2000). “Bond of near surface mounted FRP rods in concrete masonry units.” Proc., 7th Annual Int. Conf. on Composite Engineering (ICCE/7), Denver, 3–4.
EI-Dakhakhni, W. W., Hamid, A. A., and Elgaaly, M. (2004). “Seismic retrofit of concrete-masonry-infilled steel frames with glass fiber-reinforced polymer laminates.” J. Struct Eng., 1343–1352.
Essawy, A. S., and Drysdale, R. G. (1986). “Macroscopic failure criterion for masonry assemblages.” Proc., 4th Canadian Masonry Symp., Vol. 1, Univ. of New Brunswick, Canada, 263–277.
Ismail, N., Petersen, R. B., Masia, M. J., and Ingham, J. M. (2011). “Diagonal shear behavior of unreinforced masonry wallettes strengthened using twisted steel bars.” Constr. Build. Mater., 25(12), 4386–4393.
Li, T., Galati, N., Tumialan, J. G., and Nanni, A. (2005). “Analysis of unreinforced masonry concrete walls strengthened with glass fiber-reinforced polymer bars.” ACI Struct. J., 102(4), 569–577.
Mahmood, H., and Ingham, J. M. (2011). “Diagonal compression testing of FRP-retrofitted unreinforced clay brick masonry wallettes.” J. Compos. Const., 810–820.
Mann, W., and Müller, H. (1982). “Failure of shear-stressed masonry—An enlarged theory, tests and application to shear walls.” Proc. Br. Ceram. Soc., 30, 223–235.
MSJC (Masonry Standard Joint Committee) Specification. (2011). “Building code requirement for masonry structures.” ACI 530-11/ASCE 5-11/TMS 402-11, Longmont, CO.
Paulay, T., and Priestley, M. J. N. (1992). Seismic design of reinforced concrete and masonry buildings, Wiley, New York.
Silva, P. F., Yu, P., and Nanni, A. (2008). “Monte Carlo simulation of shear capacity of URM walls retrofitted by polyurea reinforced GFRP grids.” J. Compos. Constr., 405–415.
Triantafillou, T. C., and Fardis, M. N. (1997). “Strengthening of historic masonry structures with composite materials.” Mater. Struct., 30(8), 486–496.
Tumialan, G., Morbin, A., Nanni, A., and Modena, C. (2001). “Shear strengthening of masonry walls with FRP composites.” Compos 2001 Convention and Trade Show, Composites Fabricators Association, Tampo, FL.
Tumialan, J. G., Galati, N., and Nanni, A. (2003). “Fiber-reinforced polymer strengthening of unreinforced masonry walls subject to out-of-plane loads.” ACI Struct. J., 100(3), 321–329.
Umair, S. M., Numada, M., Amin, M. N., and Meguro, K. (2015). “Fiber reinforced polymer and polypropylene composite retrofitting technique for masonry structures.” Polymers, 7(5), 963–984.
Yu, P., Silva, P. F., and Nanni, A. (2004). “Innovative mechanical device for the post tensioning of GFRP bars for masonry type retrofit applications.” Exp. Mech., 44(3), 272–277.
Yu, P., Silva, P. F., and Nanni, A. (2005). “In-plane strengthening of unreinforced masonry walls with prestressed GFRP bars.” 7th Int. Symp. on Fiber Reinforced Polymer Reinforcement for Reinforced Concrete Structures (FRPRCS7), ACI, Farmington Hills, MI, 307–324.
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© 2016 American Society of Civil Engineers.
History
Received: Nov 11, 2015
Accepted: Apr 6, 2016
Published online: Jun 22, 2016
Discussion open until: Nov 22, 2016
Published in print: Feb 1, 2017
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