1,721,041 research outputs found
Prestazione di facciate a cavi sottoposte all’azione del vento variabile nel tempo
No full textIl crescente impiego del vetro in applicazioni portanti per edifici e infrastrutture si è dimostrato una questione aperta per molti progettisti strutturali (Bedon et al., 2018). Da un lato, le soluzioni disponibili (sempre più innovative) per vincolo meccanico e ancoraggio rendono l’utilizzo del vetro negli edifici estremamente versatile, specialmente se confrontato con altri materiali da costruzione. Dall’altro, permangono numerose criticità legate alla fragilità a trazione, nonché agli effetti scala tipici delle applicazioni edilizie, per elementi vetrati in diverse condizioni di carico e vincolo
Aerodynamic behaviour of hyperbolic paraboloid roofs: comparison between piv tests and cfd simulations
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Studio della forma di una tensostruttura in relazione ai carichi da vento: la copertura dello Stadio Adriatico di Pescara
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Improving the Acoustical Properties of an Elliptical Plan Space with a Cable Net Membrane Roof
No full textTextile roofs are particularly suited for covering large open spaces. They are used to make buildings that are able to dynamically change their functions. Their strengths are their great lightness and thinness. These characteristics are optimal for their load bearing function, as a roof covering, but they are not so good for the acoustic performance of the structure. This aspect is important because it makes it difficult to transform a sports arena, for example, into a music hall or auditorium. The possibility having these transformations is economically important for this kind of building. This paper is focused on the acoustic performance of a building covered with a flexible roof made of a cable net and membrane. In this specific case, the roof has a hyperbolic paraboloid geometry, and the building footprint is elliptical. The interaction between shape and acoustic performance is investigated. An acoustic improvement is proposed for the double functional aim of satisfying both speech and music. This improvement is obtained using acoustic absorbing and diffusing panels
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Progetto di una copertura a paraboloide iperbolico a pianta circolare
No full textIl presente articolo, sulla base di una ricerca finalizzata allo studio del comportamento
strutturale ed aerodinamico di reti di funi a paraboloide iperbolico, presenta il progetto di una
tensostruttura a pianta circolare e copertura a parabolide iperbolico ideata per ospitare un
palazzetto dello sport a Pescara. Il calcolo della struttura è stato effettuato in condizioni di
massima neve di normativa e con l'azione del vento calcolata sfruttando i coefficienti di
pressione elaborati in galleria del vento. Tale esempio, dunque, risulta essere di particolare
importanza in quanto applica i dati sperimentali ad un caso reale e dimostra la possibilità di
realizzare coperture di media e grande luce mediante una struttura ottimizzata e dal peso
proprio molto inferiore ad una tipologia strutturale tradizionale quale può essere una reticolare
spaziale in acciaio, un guscio in c.a. o una copertura in legno lamellare. Inoltre, si riscontrano
elevate prestazioni in condizioni di vento sia a 0°, parallelo alle funi stabilizzanti, sia a 90°,
parallelo alle funi portanti
Design of hyperbolic paraboloid roofs with circular and elliptical plan shape
No full textOn the basis of a research aimed at the parameterization of the structural responses and aerodynamic behavior of hyperbolic paraboloid cables nets with four different footprints, respectively, square, rectangular, circular and elliptical, this paper focuses on the circular and elliptical shape showing two interesting case studies. The first case study is about the design of a tensile structure with circular shape proposed as alternative roof for the multipurpose building called “Entertainment Centre” which is part of a larger environmental redevelopment project of a portion of land in the town of Massafra (TA) in order to show that this type of roof is highly competitive compared to traditional structures; the second one presents the design of a tensile structure with elliptical shape proposed to reorganize a part of the town of Agnone (IS). The structural analysis were performed by applying wind action evaluated by using the mean experimental pressure coefficients acquired in the wind tunnel. They show the optimum behavior of the hyperbolic paraboloid shape both for wind angle at 0°, parallel to the stabilizing cables, and 90°, parallel to the load bearing cables (that represents the worst load condition)
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