1,721,033 research outputs found
A Comparison Between Theoretical Predictions and Statistical Analysis of Temperature Measurements in the Leaning Tower of Pisa
No full textStatistical Analysis of Temperature Measurements in the Leaning Tower of Pisa in Comparison with Theoretical Predictions
No full textThe wide amount of temperature measurements collected in the shaft of the Leaning Tower of Pisa during four years monitoring is here analysed by means of statistical methods and compared with the theoretical values calculated with a F.E.M. analysis in a precedent work, where the transient boundary conditions reproduce the hourly variations of the main meteorological agents all over an idealised, mean meteorological year
Considerazioni su base sperimentale circa l'impiego delle correlazioni tra alcune proprietà dei calcestruzzi in situ: resistenza a compressione, densità, velocità ultrasonica e indice sclerometrico
No full textA proposal for a new normative snow load map for the Italian territory
No full textA recent scientific research, carried out by eight European institutions, produced a map of the ground-snow-load characteristic value, by using the observations at 2600 meteorological stations placed all over the European territory. Such a map represents the result of the most advanced study now available, since for the first time common methods were used to select and process data collected at the European scale. For this reason the map has been inserted within the EN version of the Eurocode 1 – Snow load, under the form of an informative annex. For code purposes, a further step is necessary to convert the European snow load map into many national normative maps, which will make part of the National Annex of each single Country. In the present work a normative map is proposed for the Italian territory, with two important simplifications respect to the European map. On first the number of the zones has been reduced to three instead of eight (four for the Mediterranean region and four for the Alpine region), secondly the contour lines of the zones coincide with administrative borders of the Provinces. The proposed normative map has been submitted to validation tests, to verify its correspondence to the physical map and to avoid discrepancies at the State border lines. It represents a first step in the development of a normative map, but such advanced to be at the exam of the Italian competent authorities for its adoption
Il carico della neve sulle costruzioni in Italia
No full textL'Eurocodice 1 - Azioni sulle Strutture - Carichi della neve è stato convertito da norma sperimentale ENV in norma EN, a conclusione di un lavoro di revisione che ha recepito i commenti inviati al CEN in forma ufficiale da parte dei Paesi membri e che ha nel contempo tenuto conto degli importanti risultati ottenuti nell'ambito di una ricerca scientifica, finanziata dalla Commissione Europea DGIII-D3 e condotta da otto istituzioni europee.
Nel presente lavoro si illustrano i risultati salienti della ricerca per quello che riguarda il territorio italiano e si propone una mappa normativa del carico neve al suolo, alternativa a quella contenuta nelle nuove norme tecniche nazionali, recentemente aggiornate con il D.M. 14/9/2005
Resistenza del calcestruzzo, misure sclerometriche e di velocità di propagazione degli ultrasuoni in strutture esistenti: risultati di una campagna di indagini
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Climate change: Impacts on climatic actions and structural reliability
No full textClimatic loads on structures are commonly defined under the assumption of stationary climate conditions; but, as confirmed by recent studies, they can significantly vary because of climate change effects, with relevant impacts not only for the design of new structures but also for the assessment of the existing ones. In this paper, a general methodology to evaluate the influence of climate change on climatic actions is presented, based on the analysis of observed data series and climate projections. Illustrative results in terms of changes in characteristic values of temperature, precipitation, snow, and wind loads are discussed for Italy and Germany, with reference to different climate models and radiative forcing scenarios. In this way, guidance for potential amendments in the current definition of climatic actions in structural codes is provided. Finally, the influence of climate change on the long-term structural reliability is estimated for a specific case study, showing the potential of the proposed methodology
Recent European research advances in snow loading and their possible implementation into the Eurocodes
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