1,721,367 research outputs found
Ipotesi ricostruttiva del fregio con grifi del portico del Foro di Cesare a Roma (disegno)
No full textRicostruzione del fregio con grifi del portico del Foro di Cesare a Rom
Effect of Over-Stroke Capacity of Curved Surface Sliders on the Collapse Safety of Seismically Isolated Buildings
No full textSeismic Behavior and Modeling of Ductile Composite Steel-Trussed Concrete Beam to Column Joints
No full textThis paper presents an experimental and numerical study on a ductile beam-column connection between a composite reinforced concrete truss (CRCT) beam and a reinforced concrete (RC) or concrete-filled tube (CFT) column subjected to bending and shear loads. Two experimental models with different beam-column joint testing schemes, extracted from the same prototype three-dimensional structure designed according to the rules of the capacity design provided by seismic code, were subjected to quasi-static cyclic tests by applying gravitational loads and the horizontal seismic force. The main objective of this paper is to verify the ductile behavior of both specimens experimentally and to simulate the experimental global and local responses by nonlinear static analysis, considering different modeling approaches. The comparison between the experimental and numerical results highlights, for both models considered, the ductile and dissipative capacity of the connection system, designed following the criteria of the hierarchy of resistances proposed by the current Italian code. The results of different experimental setups demonstrate that the tests can be repeated and the results can be reproduced by means of simple nonlinear model
Canine angiostrongylosis: recent advances in diagnosis, prevention, and treatment
Full text linkAngiostrongylus vasorum is a parasitic nematode affecting the heart and pulmonary arteries of wild (eg, foxes) and domestic canids. The parasite has an indirect life cycle in which slugs and snails act as intermediate hosts. In the last few years the parasite has spread outside the traditional endemic foci, and there is a rise of documented cases of canine angiostrongylosis across Europe. Angiostrongylus vasorum causes cardiopulmonary disorders and coagulopathies, along with different nonspecific clinical signs. Fatal infections are frequently reported. Given the severity of the infection and the recent geographic spreading of the parasite, this article reviews and discusses the current knowledge of A. vasorum, with a special focus on recent insights on diagnosis, prevention, and treatment of dog angiostrongylosis
Improving the earthquake resilience of isolated buildings with double concave curved surface sliders
No full textThe underlying concept of base isolation is the uncoupling of the horizontal building movement from ground motions using a flexible isolation layer made with either elastomeric or sliding bearings. Double Concave Curved Surface Sliders DCCSS are seismic isolators based on the pendulum principle. DCCSS isolators that do not include any mechanical elements that serve as end-stops coherently with European codes, for earthquakes stronger than the ultimate limit state ones, the inner slider runs on the edge of the sliding surfaces beyond their geometric displacement capacity (over-stroke regime) preserving the ability to support gravity loads. This paper focuses on the effects of the over-stroke displacement of DCCSS and of displacement restrainers on the seismic response of base isolated buildings considering a case study. At the first stage of testing, the numerical model of the bearings over-stroke behavior has been calibrated on an experimental displacement-controlled test carried out in this study, also considering few results available in the literature. Nonlinear static and dynamic analyses including inelastic superstructure and different basic isolation system models, with and without over-stroke effects and with and without strong end-stroke restraints, have been performed. The parametric analysis aims to estimate annual frequencies of exceeding the superstructure yielding limit when the isolators reach the maximum displacement varying end-stroke and over-stroke parameters
Base isolated buildings with curved surface sliders including displacement restraints
No full textSummary. Recent researches on seismic isolated structures are focused on the behaviour of isolation devices when extreme loading conditions are applied, with displacement demands higher than the design value [1]. Generally, the design displacement is considered as the collapse limit and no further capacity is taken into account [2]. This study investigates the effects of the presence of displacement restraints on the response of seismically isolated buildings based on Double Curved Concave Surface Sliders (DCCSS) for displacements larger than the design values. Two residential buildings case studies are considered with moment resistant steel or reinforced concrete frames both isolated with DCCSS [3] [4]. The isolated structures satisfy prescriptions of the current Italian seismic code considering the same seismic actions for the site of L’Aquila. Pushover analyses are carried out in order to estimate the engineering demand parameter (Superstructure Global Drift) limit values used for the definition of the superstructure failure condition. The effects of the impact of the isolation systems against retaining elements on the seismic response of isolated structures are highlighted. The results of multi-stripe analyses using twenty ground motions at ten different seismic intensities [5] are compared. © 2021, Scipedia S.L. All rights reserved
Rationale for the development of speckled hyperpigmentation in the areas of psoriatic plaques after treatment with biologic agents
No full textNot availabl
Edifici a telaio in legno lamellare con collegamenti post-tesi e rocking dissipativo. Prove sperimentali effettuate presso l’Università della Basilicata.
No full textIl presente articolo riporta una descrizione sintetica delle prove sperimentali svolte presso il Laboratorio Prove Materiali e Strutture dell’Università della Basilicata (Potenza, Italia) nell’ambito della collaborazione con l’Università di Canterbury (Christchurch, Nuova Zelanda).
Lo studio ha riguardato gli aspetti progettuali, realizzativi e di verifica di un innovativo sistema costruttivo per la realizzazione di edifici multipiano sismoresistenti con struttura in legno lamellare a telai con collegamenti trave-colonna realizzati utilizzando cavi post-tesi (sistema Pres-Lam), con e senza l’aggiunta di dissipazione. Un’ottimale combinazione della forza di post-tensione nei cavi e della soglia di plasticizzazione dei dissipatori fornisce al sistema strutturale un incremento dello smorzamento conservando la capacità di ricentraggio del sistema a seguito di un terremoto. Con l’obiettivo di valutare sperimentalmente la risposta sismica del sistema Pres-Lam, sono state effettuate varie sessioni di prova considerando diverse configurazioni sperimentali, differenziate in termini di livello di post-tensione, di capacità di dissipazione di energia e di condizioni di vincolo alla base dei pilastri.
Di seguito è riportata una breve descrizione delle fasi sperimentali e dei principali risultati osservati
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