Prediction of Load-Slip Behavior of FRP Retrofitted Masonry
Publication: Journal of Composites for Construction
Volume 15, Issue 6
Abstract
The out-of-plane bending resistance of a fiber-reinforced polymer (FRP)-strengthened masonry wall is generally governed by debonding failure mechanisms. The behavior at the FRP-to-masonry interface is a key factor affecting the flexural capacity as it is the means for transfer of stress between the FRP and the substrate to develop composite action. Although the beneficial effects of strengthening masonry structures with FRP materials have been demonstrated in the literature, the knowledge of the bond at the FRP-to-masonry interface is still relatively limited. To improve this understanding, this paper presents the results of a numerical investigation into the local behavior at the FRP-masonry interface. Two analytical procedures (i.e., a new generic numerical procedure and a closed-form mathematical solution) were developed to predict the global load-slip response of FRP-to-masonry pull tests by using various local bond-slip relationships. This study compares the effects of homogeneous and heterogeneous representations of the masonry substrate on the prediction of this global response and the influence of different bond-slip models and bond-slip parameters. The analytical results were validated against test data with both methods predicting the experimental behavior well. The paper concludes with recommendations regarding the influence of the heterogeneous nature of masonry and the effect of the bond-slip parameters on the load-slip response of FRP-to-masonry pull tests.
Get full access to this article
View all available purchase options and get full access to this article.
References
Albert, M. L., Elwi, A. E., and Cheng, J. J. R. (2001). “Strengthening of unreinforced masonry walls using FRPs.” J. Compos. Constr., 5(2), 76–84.
Dai, J., Ueda, T., and Sato, Y. (2005). “Development of nonlinear bond stress slip model of fiber reinforced plastics sheet-concrete interfaces with a simple method.” J. Compos. Constr., 9(1), 52–62.
Dai, J., Ueda, T., and Sato, Y. (2006). “Unified analytical approaches for determining shear bond characteristics of FRP-concrete interfaces through pull out tests.” J. Adv. Concr. Technol., 4(1), 133–145.
Daniels, A., Duffy, J., Johnsson, S., and Sedmak, J. (2009). “Flexural response of NSM CFRP retrofitted masonry walls.” Honors research rep., School of Civil, Environmental and Mining Engineering, Univ. of Adelaide, Adelaide, SA, Australia.
Galati, N., Tumialan, G., and Nanni, A. (2006). “Strengthening with FRP bars of URM walls subject to out-of-plane loads.” Constr. Build. Mater., 20(1–2), 101–110.
Ghobarah, A., and Galal, K. E. M. (2004). “Out-of-plane strengthening of unreinforced masonry walls with openings.” J. Compos. Constr., 8(4), 298–305.
Hamed, E., and Rabinovitch, O. (2007). “Out-of-plane behavior of unreinforced masonry walls strengthened with FRP strips.” Compos. Sci. Technol., 67(3–4), 489–500.
Harbison, A., and Wenzel, N. (2010). “Cyclic flexural response of NSM CFRP retrofitted masonry walls.” Honors research rep., School of Civil and Environmental Engineering, Univ. of Adelaide, Adelaide, SA, Australia.
Haskett, M., Oehlers, D. J., and Mohamed Ali, M. S. (2008). “Local and global bond characteristics of steel reinforcing bars.” Eng. Struct., 30(2), 376–383.
Hosking, D., Luong, E., Nakamura, Y., and Szuster, P. (2008). “Bond and member behaviour of NSM CFRP strengthened masonry under out-of-plane cyclic loading.” Honors research rep., School of Civil and Environmental Engineering, Univ. of Adelaide, Adelaide, SA, Australia.
Konthesingha, K. M. C., Masia, M. J., Petersen, R. B., and Page, A. W. (2009). “Bond behaviour of NSM FRP strips to modern clay brick masonry prisms under cyclic loading.” 11th Canadian Masonry Symp., Toronto, Ontario, McMaster University/Canadian Masonry Design Centre, Toronto, Ontario, Canada, 665–674.
Korany, Y., and Drysdale, R. (2006). “Rehabilitation of masonry walls using unobtrusive FRP techniques for enhanced out-of-plane seismic resistance.” J. Compos. Constr., 10(3), 213–222.
Liu, I. S. T. (2005). “Intermediate crack debonding of plated RC beams.” Ph.D. thesis, School of Civil and Environmental Engineering, Univ. of Adelaide, Adelaide, SA, Australia.
Liu, I. S. T., Oehlers, D. J., and Seracino, R. (2007). “Study of intermediate crack debonding in adhesively plated beams.” J. Compos. Constr., 11(2), 175–183.
Lu, X. Z., Teng, J. G., Ye, L. P., and Jiang, J. J. (2005). “Bond-slip models for FRP sheets/plates bonded to concrete.” Eng. Struct., 27(6), 920–937.
Mohamed Ali, M. S., Oehlers, D. J., Griffith, M. C., and Seracino, R. (2008). “Interfacial stress transfer of near surface-mounted FRP-to-concrete joints.” Eng. Struct., 30(7), 1861–1868.
Mosallam, A. S. (2007). “Out-of-plane flexural behavior of unreinforced red brick walls strengthened with FRP composites.” Composites, Part B, 38(5-6), 559–574.
Oehlers, D. J., Haskett, M., Wu, C., and Seracino, R. (2008). “Embedding NSM FRP plates for improved IC debonding resistance.” J. Compos. Constr., 12(6), 635–642.
Oehlers, D. J., and Seracino, R. (2004). Design of FRP and steel plated RC structures: Retrofitting of beams and slabs for strength, stiffness and ductility, Elsevier, Oxford, UK.
Petersen, R. B., Masia, M. J., and Seracino, R. (2009). “Bond behaviour of NSM FRP strips bonded to modern clay brick masonry prisms: Influence of strip orientation and compression perpendicular to the strip.” J. Compos. Constr., 13(3), 169–178.
Seracino, R., Saifulnaz, M. R. R., and Oehlers, D. J. (2007). “Generic debonding resistance of EB and NSM plate-to-concrete joints.” J. Compos. Constr., 11(1), 62–70.
Standards Australia. (2001). “AS 3700-2001: Masonry Structures (including Amendment 3, August 2007).” Standards Australia, Sydney, Australia.
Teng, J. G., Chen, J. F., Smith, S. T., and Lam, L. (2002). FRP strengthened RC structures, Wiley, Chichester, UK.
Teng, J. G., Yuan, H., and Chen, J. F. (2006). “FRP-to-concrete interfaces between two adjacent cracks: Theoretical model for debonding failure.” Int. J. Solids Struct., 43(18-19), 5750–5778.
Tumialan, J. G., Galati, N., and Nanni, A. (2003). “Field assessment of unreinforced masonry walls strengthened with fiber reinforced polymer laminates.” J. Struct. Eng., 129(8), 1047–1056.
Ueda, T., and Dai, J. (2005). “Interface bond between FRP sheets and concrete substrates: Properties, numerical modeling and roles in member behaviour.” 7, 27–43.
Willis, C. R., Yang, Q., Seracino, R., and Griffith, M. C. (2009). “Bond behaviour of FRP-to-clay brick masonry joints.” Eng. Struct., 31(11), 2580–2587.
Wu, Z., Yuan, H., and Niu, H. (2002). “Stress transfer and fracture in different kinds of adhesive joints.” J. Eng. Mech., 128(5), 562–673.
Xia, S., and Oehlers, D. J. (2006). “Debonding mechanisms in FRP plated unreinforced masonry under out-of-plane loading.” Adv. Struct. Eng., 9(5), 619–637.
Yuan, H., Teng, J. G., Seracino, R., Wu, Z. S., and Yao, J. (2004). “Full-range behaviour of FRP-to-concrete bonded joints.” Eng. Struct., 26(5), 553–565.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 15 • Issue 6 • December 2011
Pages: 943 - 951
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Dec 21, 2010
Accepted: May 5, 2011
Published online: May 6, 2011
Published in print: Dec 1, 2011
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.