Is it Possible to Repair Detached Composites Effectively after Failure of Masonry Strengthening

Abstract:

Strengthening of masonry structures using various externally bonded composite materials have been developed in the last decade. De-bonding of the FRP strengthening system from masonry, caused by an earthquake, has to be repaired quickly to protect the weakened structure against demolition during an aftershock. In this case the new rapid bonding methods, allowing for ductile behavior and reducing stress concentrations in the weakened masonry substrate, are missing. These rules fulfill highly deformable adhesives, made of flexible polyurethane polymers. In the paper, the results of Single Lap Shear Tests are presented, carried out on the specimens made of weak bricks strengthened using GFRP, BFRP, CFRP and SRP strips. They are compared with results obtained on the same specimens but repaired after failure using stiff epoxy adhesive and highly deformable polyurethane adhesive. Comparison of the obtained ultimate loads in damage tests and failure modes allowed determining efficiency of the tested repair methods.

• Periodical: Key Engineering Materials (Volume 624)
• Pages: 518-525
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.624.518
• Online since: September 2014
• Authors: Arkadiusz Kwiecień*, Bogusław Zając
• Keywords: Composite Strengthening, Detachment of Composite, Masonry, Repair

References

[1] M.R. Valluzzi, M. Valdemarca, C. Modena, Behavior of brick masonry vaults strengthened by FRP laminates. ASCE J. of Composites for Construction, August 2001, (5)3, 163-169.

DOI: 10.1061/(asce)1090-0268(2001)5:3(163)

[2] J. Jasieńko, Ł. Bednarz, T. Nowak, The effectiveness of strengthening historic brick vaults by contemporary methods. In: F.M. Mazzolani (Ed. ), Protection of Historical Buildings, PROHITECH' 09, Taylor and Francis Group, Rome 2009, Italy, 1299-1304.

[3] D.V. Oliveira, I. Basilio, P.B. Lourenço, Experimental behavior of FRP strengthened masonry arches. ASCE J. of Composites for Construction, 14(2010)3, 312-322.

DOI: 10.1061/(asce)cc.1943-5614.0000086

[4] M. Corradi, A. Borri, A. Vignoli, Strengthening techniques tested on masonry structures struck by the Umbria–Marche earthquake of 1997–1998. Construction and Building Materials 16 (2002), 229–239.

DOI: 10.1016/s0950-0618(02)00014-4

[5] M. Malena, G. de Felice, Debonding of composites on a curved masonry substrate: Experimental results and analytical formulation. Composite Structures 112( 2014), 194-206.

DOI: 10.1016/j.compstruct.2014.02.004

[6] M.R. Valluzzi, D. Oliveira, A. Caratelli, G. Castori, M. Corradi, G. de Felice, E. Garbin, D. Garcia, L. Garmendia, E. Grande, U. Ianniruberto, A. Kwiecień, M. Leone, G.P. Lignola, P.B. Lourenço, M. Malena, F. Micelli, M. Panizza, C.G. Papanicolaou, A. Prota, E. Sacco, T.C. Triantafillou, A. Viskovic, B. Zając, G. Zuccarino, Round Robin Test for Composite-To-Brick Shear Bond Characterization. Materials and Structures, 45(2012).

DOI: 10.1617/s11527-012-9883-5

[7] A. Kwiecień, B. Zając, P. Kuboń, Post failure repair of strengthening system made of CFRP and GFRP strips bonded to brick substrate - examined in single-lap tests. In: Proc. 6th International Conference on FRP Composites in Civil Engineering CICE'2012, Rome 2012, Italy.

[8] A. Kwiecień, Stiff and flexible adhesives bonding CFRP to masonry substrates - investigated in pull-off test and Single-Lap test. Archives of Civil and Mechanical Engineering 12 (2) 2012, Elsevier, 228–239.

DOI: 10.1016/j.acme.2012.03.015

[9] A. Kwiecień, Highly deformable polymers for repair and strengthening of cracked masonry structures. GSTF International Journal of Engineering Technology (JET) 2013 Vol. 2 No. 1, 182-196.

DOI: 10.5176/2251-3701_2.1.53

[10] A. Kwiecień, Advantages of highly deformable adhesives in strengthening of masonry using natural fibers. Architecture and Civil Engineering, ACE'2014, Singapore, GSTF, 128-137.

DOI: 10.5176/2301-394x_ace14.103