murature

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    • Damage analysis of the town of Onna (L’Aquila) after the April, 6, 2009 earthquake

    Elisabetta Aisa, Alessandro De Maria, Adriano De Sortis, Utilio Nasini

    The paper addresses the analysis of the seismic damage of Onna, a village near L’Aquila almost completely destructed during the 6 April event. A purposely developed data form has been used to collect the ob- servations of several surveyors. The analysis of the construction typologies, of the seismic vulnerability and of the damage lead to the conclusion that the poor characteristics of the masonry played a dramatic role in the seismic damage suffered by the buildings, despite that some typical historical seismic provisions were present (limited height of the buildings, wood ties). The low level of damage of some unreinforced masonry buildings in Onna, built following a good construction practice, indirectly confirms the heavy role played by the seismic vulnerability in the damage observed.

    For this paper is available an extended abstract after the text in Italian.

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    • Rehabilitation of a small borough damaged by Umbria earthquake (26/09/1997)

    Paolo Anderlini

    The paper describes the works done to repair the so called «Borgo di Pascelupo». The «Borgo di Pascelupo» is an hamlet placed in Scheggia and Pascelupo’s town, located in Umbria (Italy), damaged by the 26th of September 1997 earthquake. Both the administration and techniques aspects are analyzed.

    For this paper is available an extended abstract after the text in Italian

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    • Early comments about earthquake effects on masonry buildings in the neighbourhood of L’Aquila

    Elisa Adorni, Alessandro Amadori, Riccardo Battaglia, Beatrice Belletti, Marcello Bianchini, Alberto Borghesi, Matteo Di Cesare, Pier Paolo Diotallevi, Claudio Ferrari, Daniele Ferretti, Luca Landi, Giovanni Manieri, Luca Martelli, Giuseppina Marziali, Enrico Milani, Vania Passarella, Gianni Royer- Carfagni, Michele Antonio Sasso, Andrea Spagnoli, Antonio Tralli, Francesco Ubertini

    The present work illustrates some early considerations on the effects of the 6 April 2009 earthquake and of the following seismic sequence in some towns in the neighbourhood of L’Aquila, in central Italy. Such considerations were recorded, during technical surveys to assess the structural usability of buildings using the first-level AeDES form, by technicians of the Ground, Seismic and Geological Survey Group of Emilia-Romagna Region with the volunteer assistance of experts from Universities of Bologna, Ferrara and Parma. In the paper the attention is focused on masonry buildings since they experienced, particularly the older ones, the major damage. The seismic behaviour and the most frequent damages of recurrent typologies of masonry structures in the inspected area are described. Most of buildings are characterized by masonry structures with raw stones and sub-horizontal disposition, or by concrete bricks and large mortar joints with concrete-brick floors and roofs. Inspections in masonry structures allowed the detection of four frequent failure modes: partial decohesion of masonry walls, overall out-of-plane rotation of walls, out-of-plane flexure, in-plane flexure and shear. Moreover the behaviour of buildings strengthened with different techniques, including reinforced plaster or steel ties, is examined. Finally some considerations are made on the failure of churches.

    For this paper is available an extended abstract after the text in Italian