Seismic retrofitting of masonry vault using CFRP
Resumen
Masonry vaults represent one of the most seismic vulnerable element in an ancient building. It also generally does not possess an adequate capability of redistribution of the seismic action among the walls of the buildings. In this paper, the structural behaviour of a masonry barrel vault strengthened by a new technology in applying Carbon Fiber Reinforced Polymer (C-FRP) is discussed from both theoretical and experimental point of view. The C-FRP is applied such as to assume an Ω shape around a concrete core realized at the vault extrados. This arrangement allows the resulting CFRP reinforced ribbed vault to assume the necessary strength and membranal and flexural rigidity so as to ensure the aforementioned seismic action redistribution capability and to avoid local collapse of the vault. A theoretical prediction of ultimate strength was derived in agreement with the occurrences observed during the experiments (masonry crushing, FRP rupture, debonding, sliding along the mortar joint). To this aim, a novel incremental step-by-step lower bound limit analysis approach was developed taking into account for the shear failure mechanism at each mortar joint. The shear strength is evaluated by the Mohr-Coulomb friction law for the mortar joint and by other nonlinear Italian Code relations for CFRP Ω-Wrap reinforcement. In the approximated incremental analysis process the current value of the shear strength, depend on the compressive stress resulting from the previous step.Palabras clave
arch, vaults, masonry structure, strengthening, FRP, limit analysis, lower bound, seismic retrofitting, non-associative friction flow rule.
Citas
- Anania L., Badalà A., D’Agata G., The post strengthening of the masonry vaults by the Ώ-Wrap technique based on the use of C-FRP, Construction and Building Materials 47 (2013) 1053–1068.
- CNR-DT 200/2004, Istruzioni per la Progettazione, l'Esecuzione ed il Controllo di Interventi di Consolidamento Statico mediante l'utilizzo di Compositi Fibrorinforzati-Materiali, strutture in c.a. e in c.a.p., strutture murarie. Theoretical collapse mechanism for horizontal load at the 17 kN
- Basilio I., Fedele R., Lourenço P.B, Milani G., Assessment of curved FRP-reinforced masonry prisms: Experiments and modeling, Construction and Building Materials 51 (2014) 492–505.
- D’Ambrisi A., Feo L., Focacci F., Experimental and analytical investigation on bond between Carbon-FRCM materials and masonry, Composites: Part B 46 (2013) 15–20.
- Malena M., de Felice G., Debonding of composites on a curved masonry substrate: Experimental results and analytical formulation, Composite Structures 112 (2014) 194–206.
- Fagone M., Ranocchiai G., Briccoli Bati S., An experimental analysis about the effects of mortar joints on the efficiency of anchored CFRP-to- masonry reinforcements, Composites PartB (2015), doi: 10.1016/j.compositesb.2015.01.050.
- Anania L., Badalà A., D’Agata G., The behavior under thermal loads of the “Ώ-wrap” strategy for the strengthening of the masonry vault structures, Proc. of Eleventh East Asia-Pacific Conference on Structural Engineering & Construction (EASEC-11) “Building a Sustainable Environment, eds. Y.B Yang & al. November 19-21, 2008, Taipei, Taiwan.
- Mahini S.S., Eslami A., Ronagh H.R., Lateral performance and load carrying capacity of an unreinforced CFRP-retrofitted historical masonry vault – A case study, Construction and Building Materials 28 (2012) 146– 156.
- Mahini S.S., Smeared crack material modelling for the nonlinear analysis of CFRP-strengthened historical brick vaults with adobe piers, Construction and Building Materials 74 (2015) 201–218.
- Heyman J., The Stone Skeleton, Structural Engineering of Masonry Architecture, Cambridge University Press, 1995.
- Milani G., Valente M., Comparative pushover and limit analyses on seven masonry churches damaged by the 2012 Emilia-Romagna (Italy) seismic events: Possibilities of non-linear finite elements compare with pre-assigned failure mechanisms, Engineering Failure Analysis 47 (2015) 129–161.
- Milani G., Upper bound sequential linear programming mesh adaptation scheme for collapse analysis of masonry vaults, Advances in Engineering Software 79 (2015) 91–110.
- Milani G., Tralli A., A simple meso-macro model based on SQP for the non-linear analysis of masonry double curvature structures, International Journal of Solids and Structures 49 (2012) 808–834.
- Milani G., Simoni M., Tralli A., Advanced numerical models for the analysis of masonry cross vaults: A case-study in Italy, Engineering Structures 76 (2014) 339–358.
- Basilio I., Fedele R.,. Lourenço P.B, Milani G., Assessment of curved FRP-reinforced
- masonry prisms: Experiments and modeling, Construction and Building Materials 51 (2014) 492–505.
- Block P., Lachauer L., Three-dimensional funicular analysis of masonry vaults, Mechanics Research Communications 56 (2014) 53–60.
- Fraternali F., A thrust network approach to the equilibrium problem of unreinforced masonry vaults via polyhedral stress functions, Mechanics Research Communications 37 (2010) 198–204.
- Baratta A., O. Corbi, Closed-form solutions for FRP strengthening of masonry vaults, Computers and Structures 147 (2015) 244–249.
- Badalà A., Cuomo M., D’Agata G., Limit Analysis Of CFRP Reinforced Masonry Vaults: An Appoximated Incremental Algorithm GIMC 2010
- Badalà A., Cuomo M., D’Agata G., Analisi limite di volte a botte rinforzate con C-FRP-AIMETA2009-Ancona, 14-17 Settembre, 2009.
- Italian Code D.M.14/01/2008 – Approvazione delle nuove norme tecniche per le costruzioni.
Cómo citar
Anania, L., Badalà, A., & D’agata, G. (2017). Seismic retrofitting of masonry vault using CFRP. Alternativas, 17(3), 15–23. https://doi.org/10.23878/alternativas.v17i3.208
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