1,721,012 research outputs found
Interventi migliorativi in acciaio a tutela delle opere di interesse storico-monumentale dal rischio sismico
No full textThe research concerns the analysis of structural behaviour of some historic-monumental buildings in which steel structures are used for the seismic protection. A dynamic model has been made to individuate the macro-element with an high seismic risk, that is, for church studied, the drum-dome system. Then a scaled model has been tested to determinate the evolution of the lesions, the retrofitting works, that are constituted by steel frames, bare or braced, inserted inside door/window holes of the drum-dome system, and the variation structural ductility. An elastic linear analysis, with a FEM software, has been developed for other type of buildings, in which the vertical structures are made with squared blocks of calcarenite connected by mortar. These buildings have the plan of rectangular shapes and are characterized by flexible floors. A suitable upgrading technique consists in using horizontal braced steel frames connected to the walls in order to prevent local mechanisms and to limit the interstorey drift values
Analisi In Regime Non Lineare Dei Sistemi Strutturali Cupola-Tamburo Finalizzata Alla Mitigazione Del Rischio Sismico
No full textInfluence of Constitutive Laws and Safety Factors of Materials on Resistance and Ductility of Reinforced Concrete Sections
No full text
EXPERIMENTAL SEISMIC ANALYSIS OF MONUMENTS FOR RISK MITIGATION
No full textAn experimental investigation, at the moment in progress, for the evaluation of the seismic vulnerability of a
monumental structure and the effects of some reinforcement devices are presented. Referring to this
monumental structure, that is a church, the authors obtained the dynamically identified analytical model and
recognized that the drum-dome system was one of the macro-elements with highest risk. This result was
obtained by analyzing the linear behaviour. In order to study the nonlinear behaviour, tests on reduced scale
models were necessary. The models, with and without risk mitigation reinforcements, were subjected to seismic
input with rising intensity in order to know the effects of the reinforcements themselves. A study was also
begun in order to determine the ultimate load and ductility resources given by the various types of
reinforcements used. Through the paper some details of the above investigation are discussed and the last
results are presented
Duttilità strutturale negli edifici in c.a. irrigiditi da controventi reticolari. Criteri di dimensionamento ottimale
No full textLa mitigazione del rischio sismico del patrimonio costruito di interesse storico-monumentale
No full textInfluence of concrete cover on the compressive strength of fiber reinforced concrete columns
No full textThe paper focuses on the influence of the concrete cover on the strength of confined compressed columns made of fiber reinforced concrete. A mechanical model has been developed based on the ultimate state conditions of concrete core, concrete cover and transverse steel. The cases of plain concrete and fiber reinforced concrete are analysed and focus on the beneficial effects due to the presence of fibers. The model has been verified against data obtained from concentric compressive tests on concrete specimens reinforced with transverse steel and fibers
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