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Keywords: tuff masonry, fibre-reinforced plastic, cross layout, shear strength, CNR-DT 200/2004.

Summary

Studies at various levels on the use of fibre-reinforced plastic (FRP) as strengthening materials have been numerous, but only few of them concern the case of soft stone masonry panels strengthened with FRP applied in cross pattern.

Closed-form expressions for cross layout have been recently addressed by Prota et al. [1] and Zhao et al. [2]. However, experimental and analytical investigations are still lacking and no design rules have been provided in the recent guidelines CNR DT 200/2004 [3] or ACI 2008 [4] for FRP cross configurations.

The aim of this paper is to develop further knowledge concerning the in-plane shear capacity of masonry panels strengthened with FRP cross layouts. On the basis of the experimental data available in the literature [5], the work presents a quantitative evaluation of FRP and masonry contributions to the shear strength of the strengthened panels, in accordance with a strut-and-tie approach. Relevant information are provided concerning experimental force-displacement relationships and intermediate FRP debonding strains for panels strengthened with CFRP and GFRP, both with low and high density. Finally, a critical comparison between the experimental masonry shear strength and that predicted with analytical models suggested by the Italian code NTC 08 [6] and the CNRDT 200/2004 guideline is presented.

References

1: A. Prota, G. Manfredi, F. Nardone, "Assessment of Design Formulas for In-Plane FRP Strengthening of Masonry Walls", Journal of Composites for Construction, 12(6), 643-649, 2008. doi:10.1061/(ASCE)1090-0268(2008)12:6(643)
2: T. Zhao, C.J. Zhang, J. Xie, "Experimental Study on Earthquake Strengthening of Brick Walls with Continuos Carbon Fibre Sheet", Masonry International, 16(1), 21-25, 2003.
3: CNR-DT 200/2004, "Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Existing Structures", CNR - National Research Council, Rome, Italy, 2008.
4: American Concrete Institute (ACI), "Guide for the Design and Construction of Externally Bonded FRP systems for strengthening URM structures", Draft version of ACI 440 Committee, July, 2008.
5: G. Marcari, G. Manfredi, A. Prota, M. Pecce, "In-plane shear performance of masonry panels strengthened with FRP", Composite Part B, 38, 887-901, 2007. doi:10.1016/j.compositesb.2006.11.004
6: NTC 08 "Norme tecniche per le costruzioni", D.M. 14 gennaio 2008 (G.U. n. 29 del 04.02.2008, Suppl. Ord. n.30).

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 93 PROCEEDINGS OF THE TENTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: B.H.V. Topping, J.M. Adam, F.J. Pallarés, R. Bru and M.L. Romero Paper 233 In-Plane Behavior of Tuff Masonry Panels Strengthened with Fibre-Reinforced Plastic Cross Layout G. Marcari¹, D.V. Oliveira¹, G. Fabbrocino² and P.B. Lourenço¹ ¹Department of Civil Engineering, ISISE, University of Minho, Portugal ²Strega Lab, University of Molise, Italy doi:10.4203/ccp.93.233 purchase the full-text of this paper Full Bibliographic Reference for this paper G. Marcari, D.V. Oliveira, G. Fabbrocino, P.B. Lourenço, "In-Plane Behavior of Tuff Masonry Panels Strengthened with Fibre-Reinforced Plastic Cross Layout", in B.H.V. Topping, J.M. Adam, F.J. Pallarés, R. Bru, M.L. Romero, (Editors), "Proceedings of the Tenth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 233, 2010. doi:10.4203/ccp.93.233 Keywords: tuff masonry, fibre-reinforced plastic, cross layout, shear strength, CNR-DT 200/2004. Summary Studies at various levels on the use of fibre-reinforced plastic (FRP) as strengthening materials have been numerous, but only few of them concern the case of soft stone masonry panels strengthened with FRP applied in cross pattern. Closed-form expressions for cross layout have been recently addressed by Prota et al. [1] and Zhao et al. [2]. However, experimental and analytical investigations are still lacking and no design rules have been provided in the recent guidelines CNR DT 200/2004 [3] or ACI 2008 [4] for FRP cross configurations. The aim of this paper is to develop further knowledge concerning the in-plane shear capacity of masonry panels strengthened with FRP cross layouts. On the basis of the experimental data available in the literature [5], the work presents a quantitative evaluation of FRP and masonry contributions to the shear strength of the strengthened panels, in accordance with a strut-and-tie approach. Relevant information are provided concerning experimental force-displacement relationships and intermediate FRP debonding strains for panels strengthened with CFRP and GFRP, both with low and high density. Finally, a critical comparison between the experimental masonry shear strength and that predicted with analytical models suggested by the Italian code NTC 08 [6] and the CNRDT 200/2004 guideline is presented. References 1 A. Prota, G. Manfredi, F. Nardone, "Assessment of Design Formulas for In-Plane FRP Strengthening of Masonry Walls", Journal of Composites for Construction, 12(6), 643-649, 2008. doi:10.1061/(ASCE)1090-0268(2008)12:6(643) 2 T. Zhao, C.J. Zhang, J. Xie, "Experimental Study on Earthquake Strengthening of Brick Walls with Continuos Carbon Fibre Sheet", Masonry International, 16(1), 21-25, 2003. 3 CNR-DT 200/2004, "Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Existing Structures", CNR - National Research Council, Rome, Italy, 2008. 4 American Concrete Institute (ACI), "Guide for the Design and Construction of Externally Bonded FRP systems for strengthening URM structures", Draft version of ACI 440 Committee, July, 2008. 5 G. Marcari, G. Manfredi, A. Prota, M. Pecce, "In-plane shear performance of masonry panels strengthened with FRP", Composite Part B, 38, 887-901, 2007. doi:10.1016/j.compositesb.2006.11.004 6 NTC 08 "Norme tecniche per le costruzioni", D.M. 14 gennaio 2008 (G.U. n. 29 del 04.02.2008, Suppl. Ord. n.30). purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £145 +P&P)
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