1,721,113 research outputs found
Formulation of elastic earthquake input energy spectra
No full textThe object of this paper is to introduce a procedure for the determination of elastic design earthquake input energy spectra taking into account the influence of magnitude, soil type and distance from the surface projection of the fault. Firstly, an accurate selection of a large set of representative records has been realized. Secondly, the construction of the design input energy spectra has required determining the spectral shapes and a normalization factor which measures seismic hazard in terms of energy. This factor, denoted as the seismic hazard energy factor, has been defined as the area under the earthquake input energy spectrum in the period interval between 0.05 and 4.0 s. Finally, due to the importance of the source-to-site distance in the evaluation of the input energy, an investigation into the attenuation of the seismic hazard energy factor has been carried out
Influenza delle pulsazioni accelerometriche di lunga durata sui danneggiamenti osservati in recenti terremoti
No full textFormulazione energetica del potere distruttivo dei terremoti: analisi alla sorgente, propagazione, effetti locali e risposta strutturale
No full textDottorato di ricerca in ingegneria delle strutture. 8. ciclo. Coordinatore F. VestroniConsiglio Nazionale delle Ricerche - Biblioteca Centrale - P.le Aldo Moro, 7, Rome; Biblioteca Nazionale Centrale - P.za Cavalleggeri, 1, Florence / CNR - Consiglio Nazionale delle RichercheSIGLEITItal
Parameters to be considered in the establishment of the design earthquake based on energy concepts
No full textImplicancias de reciente estudios energeticos sobre la evaluacion de la peligrosidad sismica y la definicion de las acciones sismicas
No full textInfluence of masonry infill modelling on the seismic response of reinforced concrete frames
No full textIn this study the influence of masonry infills modelling on the seismic response of reinforced concrete frames is investigated. First, various models are described and discussed, then an reinforced concrete frame, designed to be representative of an existing building in Italy, is analysed by means of numerical non linear static (push-over) analyses considering both the bare frame (as a reference model) and the infilled one. Different macro-models based on the equivalent strut approach are used with the aim of carrying out a comparison between them. The analyses are performed by means of the OpenSees software package. Beams and columns are modelled with elastic beam elements connected in series to zero-length nonlinear rotational springs located at members ends for representing plastic hinges. The infills are modelled with truss elements, to which a uniaxial material is assigned. The parameters which characterize the uniaxial material change with the infill model adopted. The results show that there is a noticeable difference of stiffness and strength estimated by means of different models
Sull’attenuazione dell’intensità macrosismica in alcune zone sismogenetiche italiane
No full textNel presente lavoro si esaminano le problematiche connesse con l’attenuazione dell’Intensità Macrosismica, prendendo come riferimento il modello proposto da Grandori et al. Si esamina la parametrizzazione della legge di Grandori, realizzata in base ai dati macrosismici disponibili, sia nella Sicilia Sud Orientale che in Italia Meridionale. Successivamente si confrontano i risultati ottenuti con le leggi corrispondenti ad altre zone o regioni del territorio italiano. Il quadro complessivo derivante dal confronto indica considerevoli differenze tra le attenuazioni corrispondenti alle diverse regioni. Conseguentemente l’adozione di un’unica relazione per l’intero territorio italiano potrebbe condurre a risultati poco affidabili in un’analisi di rischio sismico
Il terremoto di Kobe del 1995: danneggiamenti osservati su edifici e correlazione con l’Input Sismico
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