0000000001211978

AUTHOR

N Spinella

A Handy Stress-Strain Law for FRP Confined Concrete

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Un criterio di selezione dell’input sismico per l’analisi dinamica non lineare delle strutture

Viene proposto un metodo di selezione di accelerogrammi naturali da impiegare nell’analisi dinamica non lineare al passo. Allo scopo di valutare la capacità dei parametri di intensità sismica di rappresentare il potenziale di danneggiamento del sisma, sono stati analizzati gli spettri delle correlazioni tra i parametri di intensità sismica che caratterizzano le registrazioni accelerometriche ed i parametri cinematici, energetici e di danno rappresentativi della risposta strutturale di un sistema ad un grado di libertà. In tale ambito, è stato definito un nuovo parametro di intensità sismica in forma integrale, l’Accelerazione di Picco Efficace per la Struttura (SEPA - Structure Effective Pe…

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EXPERIMENTAL INVESTIGATION ON R.C. BEAMS RETROFITTED IN FLEXURE AND SHEAR BY PRETENSIONED STEEL RIBBONS

The experimental results of three and four point loading tests on reinforced concrete beams strengthened by angles and/or pre-stressed stainless steel ribbons (CAM system) are presented. The stainless steel prestressed ribbons play the role of adjunctive transversal reinforcement as well as confine the structural element. Six flexural critical beams and nine shear critical beams were tested. In the first group four beams were retrofitted with bottom stainless steel angles and transversal ribbons, with two different spacing. In the second group three specimens were retrofitted by wrapping the beam with the ribbons, while three specimens were strengthned by perforation of the beam beneath the…

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Proposal of a Selection Criterium of Natural Accelerograms for NLRHA

A selection criterion to obtain different sets of accelerograms, all of them satisfying the spectrum compatibility criteria imposed by the codes, that enable a reliable assessment of the seismic demand for a given structure is proposed. The formulation is based on a preliminary evaluation of correlations among Intensity Measure parameters for ground motion and cinematic, energetic and damage parameters describing structure non linear responses. To this aim, a modified expression of the Effective Peak Acceleration EPA* is proposed, defined over the range of structure fundamental period referring to undamaged and damaged model. The analyses are carried out analyzing the response of a three pl…

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