1,720,982 research outputs found
Prove sperimentali speditive e valutazioni di vulnerabilità delle murature
No full textIl contributo descrive le modalità di studio, le prove eseguite e i risultati della campagna di ricerca su edifici danneggiati da sisma a Nocera Umbra, realizzata a seguito di convenzione tra Ministero per i Beni e le Attività Culturali- Istituto Centrale per il Restauro e Università IUAV di Venezia, responsabili scientifici Francesco Doglioni e Giulio Mirabella Roberti
Caratterizzazione della risposta statica e dinamica di architetture storiche: la campagna di misure sul Torrazzo di Cremona
No full textMeccanismi e fattori di crisi del sistema strutturale ad entro-piombo a Venezia ed aspetti concettuali degli interventi di consolidamento
No full textIl testo analizza il ruolo degli assetti ad entro-piombo dei fronti dell'edilizia veneziana, riconosciuti come intenzionali e iniziali, nel favorire speciali comportamenti di danno
PHOTOGRAMMETRY for QUICK SURVEY in EMERGENCY CONDITIONS: The CASE of VILLA GALVAGNINA
Full text linkPhotogrammetry is a survey method that provides good quality results also by using basic photographic equipment and user-friendly, low-cost software. The advantages of the image-based modelling techniques compared with the traditional topographic tools are very significant in emergencies, when the time for the survey is limited and many buildings are involved, as usually happens in case of relevant seismic events. The goal of this study is to verify the quality of the models obtained from quick digital images acquisition, carried out under non-optimal lighting condition and no accessibility of the building. As case of study was chosen the main front of Villa Galvagnina in Moglia, a Renaissance hunting palace badly damaged by the earthquake of May 20, 2012. The modelling was performed using two different software, Agisoft Metashape and 3DFlow Zephyr. This paper presents a comparison between the results obtained using different datasets; the workflow, the difficulties encountered during the survey and the data processing methods are fully described and discussed. © 2019 International Society for Photogrammetry and Remote Sensing. All rights reserved
1.02 - Historic Masonry Structures
No full textThe time-dependent behaviour of ancient masonry structures, often characterized by non-homogeneous load-bearing sections, is considered among the factors affecting the structural safety of monumental buildings. Together with other synergetic aspects, this has proved to be involved in collapses, which occurred during the last thirty years.
Exploiting the ancient (from the Middle Ages to the sixteenth century) masonry coming from the ruins of the collapsed tower of Pavia, several experimental procedures have been adopted to understand the phenomenon, from creep to pseudo-creep tests at different time intervals, and various rheological models have been applied to describe the creep evolution and creep-induced damage
Valutazione speditiva della vulnerabilità sismica di murature in pietra: un caso di studio
Full text linkIl presente lavoro riprende alcuni risultati ottenuti nel corso di una ricerca sviluppata per conto dell’ICR nell’ambito del programma ENEA – MIUR per la mitigazione del rischio da catastrofi naturali sul patrimonio culturale. Il programma ha consentito la messa a punto e la sperimentazione di procedure di analisi integrata di dati tecnici di pericolosità territoriale sismica e di vulnerabilità individuale, realizzata approfondendo i dati relativi ad un territorio campione della regione Umbria (comune di Nocera Umbra) e delle relative fabbriche già schedate. La ricerca ha consentito di individuare ed elaborare una serie di parametri semplici in grado di caratterizzare le murature in pietrame dal punto di vista del comportamento meccanico. A questi sono correlati i risultati di prove di caratterizzazione meccanica e chimico fisica sui materiali costituenti, eseguite in situ e in laboratorio, in modo da ottenere una procedura ripetibile per la determinazione di indici complessivi di vulnerabilità.This paper recall some of the results obtained during a research developed on behalf of the ICR, in the framework of a program ENEA-MIUR for the reduction of the risk for natural catastrophes to the cultural heritage. The program allowed setting up and testing
integrated procedures for the analysis of technical data of territorial seismic danger and individual vulnerability, developed on a test area in the Umbria region (the municipality of Nocera Umbra) and their buildings already documented. The research allowed selecting and elaborating a series of simple parameters able to characterize stone masonry regarding their mechanical behaviour. The results of some tests of mechanical and chemical-physical characterization, obtained both in situ and in the laboratory, are also correlated, in order to obtain a repeatable procedure for the determination of an overall vulnerability index
Experimental research on the creep behaviour of historic masonry
No full textAfter the collapse of the tower of Pavia, like often happens after a catastrophic event, a new attention was paid to the variable time within the study of the mechanical behaviour of ancient masonry, and experimental and numerical researches were systematically carried out to deepen its knowledge. In the paper, a state of the art of the results obtained by different testing procedures on specimens coming from different historic towers is presented. The difficulties of carrying out real creep test and the suitability of simpler experimental procedures will be discussed and pointed out
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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