Design Criteria for Masonry Reinforcement with Composite Reinforced Mortars (CRM)

Abstract:

There is an emerging need to upgrade historic masonry buildings and infrastructures which are most vulnerable to earthquakes. An objective of a long-term research program at Perugia University, Italy was developing design criteria for masonry reinforcement using a new class of materials, using Composite Reinforced Mortars (CRM). These are typically made of fiberglass meshes embedded into a cementitious or lime mortar, which offers higher sustainability features, in terms of vapour permeability and compatibility with masonry, lower costs, and better performance at high temperatures, compared to more traditional steel rebar jacketing or epoxy-bonded composites. These design criteria have been based on a comprehensive experimental and numerical research plan that included a study of the influence of reinforcing material, coating and wall thickness, and associated masonry strength and elastic properties, and the interaction of different stress states on bond behavior at interface masonry-to-coating. A design equation suitable for ultimate load design has been developed. Finally, analytical models regarding the lateral capacity of shear walls are briefly discussed.

• Periodical: Key Engineering Materials (Volume 916)
• Pages: 498-504
• DOI: https://doi.org/10.4028/p-k031gd
• Online since: April 2022
• Authors: Antonio Borri, Giulio Castori, Marco Corradi*
• Keywords: Advanced Design Methods, Composite Materials, GFRP, Mechanical Testing

References

[1] N. Gattesco, A. Dudine, Effectiveness of masonry strengthening technique made with a GFRP-mesh-reinforced mortar coating, Proc. 8th Int. Masonry Conference, 4-7 July 2010, Dresden, Germany.

DOI: 10.1007/s10518-014-9684-z

[2] N. Gattesco, A. Dudine, Il rinforzo di murature esistenti con intonaco e rete in GFRP, Structural, 164 (2010) 50-61, (in Italian).

[3] N. Gattesco, A. Dudine, A GFRP mesh strengthening technique applied to ancient masonry walls, Proc. 5th International Conference on Advanced Composites in Construction 2011 - ACIC 2011, 6-8 Sept. 2011, Coventry, U.K.

[4] M. Ashraf, A. Khan, A. Naseer, Q. Ali, B. Alam, Seismic behavior of unreinforced and confined brick masonry walls before and after ferrocement overlay retrofitting. International Journal of Architectural Heritage 6 (2012) 665–688.

DOI: 10.1080/15583058.2011.599916

[5] M. Maalej, V.W.J. Lin, M.P. Nguyen, S.T. Quek, Engineered cementitious composites for effective strengthening of unreinforced masonry walls. Engineering Structures, 32 (2010) 2432-2439.

DOI: 10.1016/j.engstruct.2010.04.017

[6] P. Rocchi, A. Ambrosi, F. Braga. Atlante del consolidamento degli edifici storici. Proctor, 2008, (in Italian).

[7] A. Giuffrè, A. Sicurezza e consevazione dei centri storici: il caso Ortigia: codice di pratica per gli interventi antisismici nel centro storico. Laterza, 2000, (in Italian).

DOI: 10.4995/thesis/10251/192110

[8] ICOMOS, International Scientific Committee for Analysis and Restoration of Structures of Architectural Heritage. Recommendations for the analysis, conservation and structural restoration of architectural heritage, Guidelines of ICOMOS 14th General Assembly, Victoria Falls, US (2003).

DOI: 10.1080/13556207.2007.10785001

[9] A. Borri, G. Castori, M. Corradi, R. Sisti, Tecniche innovative di rinforzo di murature storiche. Proc. 15th Conference ANIDIS L'Ingegneria Sismica in Italia, 30 June – 4 July 2013, Padova, Italy (in Italian).

[10] E. Zanello, Rinforzo strutturale e conservazione: esempio applicativo su edifici storici in tufo, Recupero e Conservazione Magazine, 7-8 (2017) 72-82 (in Italian).

[11] L. Righetti, V. Edmondson, M. Corradi, A. Borri, A. Fibreglass grids as sustainable reinforcement of historic masonry, Materials, 9 (2016) 603.

DOI: 10.3390/ma9070603

[12] A. Borri, G. Castori, M. Corradi, A. De Maria, A method for the analysis and classification of historic masonry. Bulletin of Earthquake Engineering 13 (2015) 2647จC2665.

DOI: 10.1007/s10518-015-9731-4

[13] A. Borri, M. Corradi, A. De Maria, R. Sisti, Calibration of a visual method for the analysis of the mechanical properties of historic masonry, Procedia Structural Integrity 11 (2018) 418-427.

DOI: 10.1016/j.prostr.2018.11.054

[14] ASTM E519 / E519M Standard Test Method for Diagonal Tension (Shear) in Masonry Assemblages, (2010).

[15] M. Corradi, A. Borri, G. Castori, R. Sisti, Shear strengthening of wall panels through jacketing with cement mortar reinforced by GFRP grids, Composites Part B: Engineering, 64 (2014) 33-42.

DOI: 10.1016/j.compositesb.2014.03.022

[16] RILEM LUMB6-Diagonal tensile strength tests of small wall specimens. Tech Rep, RILEM, (1994).

DOI: 10.1201/9781482271362-309

[17] ANSYS, Engineering Simulation Software, Fluent 14.0 user's guide. ANSYS FLUENT Inc, (2011).

[18] G. Castori, A. Borri, M. Corradi, FEM analysis of masonry walls reinforced with traditional strengthening techniques. 10th International Masonry Conference, 2018. Milan, Italy.

[19] Italian Building Code, 2018. Aggiornamento delle Norme tecniche per le costruzioni (No. 8). Act 17 Jan. 2018, Gazzetta Ufficiale No. 42, (in Italian).

[20] Italian Building Code, Guidelines, Istruzioni per l'applicazione delle «Nuove Norme Tecniche per le Costruzioni» di cui al decreto ministeriale 17 gennaio 2018, (in Italian).