Abstract
The Borbone constructive system, constituted by masonry reinforced with timber frames, was conceived in the Calabria region after the earthquake of 1783. In fact, subsequently to this catastrophic event Ferdinando of Borbone the IV immediately drew up an anti-seismic code in which prescribed, among the other rules, the buildings reconstruction to be carried out with the reinforcement of a skeleton of timber elements. Also the residence of the Bishop of Diocese of Mileto-Nicotera-Tropea was built in Mileto (Vv), at the end of 18th c., adopting the Borbone anti-seismic system. This “baracca” of the Bishop was investigated with an accurate dimensional and structural survey, supported by petrographic and chemical analysis of mortars and stones and by assessment of the wood species of the inner members of the load bearing system. All these data allowed the designers to realize an “imperfectly” identical copy of the bishop’s building wall. The paper will present the results of quasi-static cyclic tests according to UNI EN 12512:2003, on the full scale specimen of the Mileto masonry reinforced with timber framing. Furthermore, the hysteretic behaviour (ductility, energy dissipation, equivalent viscous damping ratio, strength impairment) of the Borbone constructive system will be discussed in the document, with a special focus on the single anti-seismic contribution of masonry and timber frame to the overall cyclic stiffness.
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1Relative to this Calabrian wood specie, an experimental campaign performed at the CNR Ivalsa in Florence showed better mechanical features if compared to chestnut characterized by other European countries provenience.
See Brunetti [5].
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2 Ductility is the capacity to undergo large displacement in the plastic field without a resistance impairment. It can be evaluated by means of the ratio between the ultimate slip and the yield slip. The energy dissipation is given by the area of the force-displacement loop for half cycle due to inelastic deformation (hysteresis). The hysteresis equivalent damping ratio is the ratio between the dissipated energy Ed and the in-put energy Ep, (Veq = Ed/2π Ep) measured in this case for the 3rd cycle of each ductility level. The resistance impairment is the load decreasing due to the reaching of an identical displacement between the first and the third cycle See UNI EN 12512:2003, Timber structures—Test methods—Cycling testing of joints made with mechanical fasteners.
References
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Acknowledgments
The authors would like to acknowledge Regione Calabria for financial support; Prof. Crisci, Dr. Miriello and Dr. Barca (Earth Science department of University of Calabria) for petrographic analyses and analyses on the mortar. Furthermore the authors thank Dr. Bonamini (CNR Ivalsa) for wooden specie analyses; Prof. Ceccotti, Eng. Polastri and technical staff for tests performed at CNR Ivalsa in San Michele (Tn).
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Ruggieri, N., Zinno, R. (2015). Behaviour of the Borbone Constructive System Under Cyclic Loading: Preliminary Report. In: Ruggieri, N., Tampone, G., Zinno, R. (eds) Historical Earthquake-Resistant Timber Frames in the Mediterranean Area. Springer, Cham. https://doi.org/10.1007/978-3-319-16187-7_4
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DOI: https://doi.org/10.1007/978-3-319-16187-7_4
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