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Strengthening Buildings of Stone Masonry to Resist Earthquakes

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Masonry Construction

Abstract

Stone masonry buildings are common in many areas in the Alpine-Himalayan earthquake zone, and their failure in recent earthquakes has been the cause of many deaths. Poverty and lack of alternatives prevent the replacement of stone masonry with more ductile materials, but the brittleness of unreinforced stone masonry can be considerably reduced by the incorporation of horizontal lacings of timber or reinforced mortar.

As part of a joint research project with the Turkish Earthquake Research Institute in Ankara to study low-cost upgrading strategies for rural earthquake protection, full-scale wall elements were subjected to static lateral loading test and dynamic tests on an impulse table. A simple ‘yield-line analysis’ based on wall overturning was shown to be able to give a useful prediction of the mode of failure and failure load in the static test, and give guidance on the relative performance of unreinforced and reinforced walls in the dynamic test. The results of these tests were used to assess the cost-effectiveness of a large-scale programme of upgrading rural buildings in eastern Turkey.

Sommario

Gli edifici in muratura di pietra sono molto diffusi in ampie zone della regione sismica alpinohimalayana ed il loro crollo ha provocato la perdita di numerose vite umane durante gli ultimi eventi sismici. Spessola poverta’ e la mancanza di alternative impediscono la sostituzione della muratura di pietra con materiali piu’ duttili: ciononostante il comportamento di tale materiale puo’ essere sostanzialmente migliorato incorporando cuciture orizzontali di legno od introducendo elementi metallici nei ricorsi di malta. Il progetto di ricerca che si va sviluppando congiuntamente con l’Istituto Turco di Ricerca sui Terremoti di Ankara si propone di individuare una serie di provvedimenti di basso costo per migliorare la qualita’ antisimica dell’edilizia rurale. In tale schema sono stati condotti una serie di esperimenti su pannelli murari in scala reale soggetti a carichi statici laterali ed a prove dinamiche su tavola vibrante. Una semplice analisi a rottura basata sul ribaltamento dell’elemento murario si e’dimostrata in grado di fornire accurate previsioni sui meccanismi e sui carichi di rottura nelle prove statiche, e dare utili indicazioni sul comportamento di pannelli semplici e rinforzati sottoposti a prove dinamiche.

I risultati di tali prove sono stati utilizzati per una analisi cost-benefici per la definizone di un programma su larga scalla del miglioramento del comportamento sismico di edifici rurali nella Turchia Orientale.

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References

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© 1992 Springer Science+Business Media Dordrecht

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Spence, R., Coburn, A. (1992). Strengthening Buildings of Stone Masonry to Resist Earthquakes. In: Calladine, C.R. (eds) Masonry Construction. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2188-2_6

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  • DOI: https://doi.org/10.1007/978-94-017-2188-2_6

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-90-481-4172-2

  • Online ISBN: 978-94-017-2188-2

  • eBook Packages: Springer Book Archive

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