Dissertations / Theses on the topic 'Strutture miste'
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RIZZATO, Michele. "APPROCCIO AGLI SPOSTAMENTI PER L’ANALISI DI STRUTTURE A PARETE E MISTE IN CEMENTO ARMATO." Doctoral thesis, Università degli studi di Ferrara, 2010. http://hdl.handle.net/11392/2389164.
Full textZamparo, Roberto. "Realizzazione di un codice per la progettazione assistita di impalcati da ponte in struttura mista acciaio-calcestruzzo." Doctoral thesis, Università degli studi di Trieste, 2009. http://hdl.handle.net/10077/3155.
Full textRealizzazione di un codice per la progettazione assistita di impalcati da ponte in struttura mista acciaio- calcestruzzo. Esecuzione del processo di ottimizzazione mediante un software commerciale ed un codice di nostra realizzazione.
XXI Ciclo
1975
Petrovich, Francesca. "Un nuovo sistema strutturale per edifici multipiano in zona sismica realizzato mediante elementi tralicciati misti acciaio-calcestruzzo:analisi numerica e sperimentale." Doctoral thesis, Università degli studi di Trieste, 2008. http://hdl.handle.net/10077/2744.
Full textIl presente progetto di dottorato si è soffermato sull’analisi di un nuovo sistema costruttivo ad elementi tralicciati misti acciaio-calcestruzzo. Scopo principale del sistema è quello di sviluppare la prefabbricazione edilizia, con particolare riguardo a quella relativa ad edifici multipiano, a destinazione civile, ubicati in zona sismica. Il lavoro è partito dall’analisi delle tipologie esistenti di strutture miste e prefabbricate per individuare le caratteristiche e le problematiche che emergono da questi sistemi costruttivi. È stata quindi individuata una tipologia di edificio, a destinazione direzionale, che poteva venir realizzato utilizzando il nuovo sistema strutturale proposto. Così da individuare le caratteristiche di sollecitazione sui vari elementi strutturali. Con i dati forniti dalla progettazione della struttura nel suo insieme, è stata determinata la geometria della sezione di tre particolari elementi, due travi, una prima fase ed una in seconda fase, ed un nodo trave-colonna. Successivamente sono state svolte, presso il laboratorio del Dipartimento di Ingegneria Civile dell’Università degli Studi di Trieste, le prove sperimentali sui campioni presi in considerazione: due travi tralicciate e un nodo trave-colonna. Tali prove hanno lo scopo di mettere in luce gli aspetti significativi del comportamento a taglio e flessione delle travi e il comportamento del nodo strutturale trave-colonna in condizioni cicliche. Per tutti i campioni si è proceduto al posizionamento di adeguati strumenti di misura al fine di investigare in maniera quantitativa il comportamento dei vari elementi durante l’esecuzione delle prove. Come termine di paragone con i dati sperimentali, sono state svolte delle analisi numeriche, mediante la modellazione dei provini con un codice di calcolo ad elementi finiti (ABAQUS) che permette una modellazione molto accurata della geometria della struttura e delle caratteristiche dei materiali impiegati. In seguito alla comparazione dei risultati numerico-sperimentali ottenuti, vengono proposte delle leggi numeriche di comportamento semplificate, di tipo sperimentale, utili nella progettazione di costruzioni con questo sistema tralicciato misto acciaio-calcestruzzo.
XIX Ciclo
1974
Lucia, Pasquale. "Progettazione ottimale di ponti in struttura mista acciaio-calcestruzzo ad asse retiline o mediante algoritmi evolutivi." Doctoral thesis, Università degli studi di Trieste, 2008. http://hdl.handle.net/10077/2751.
Full textLe tecniche di progettazione basate su criteri di ottimo sono state fino ad ora poco impiegate nell’ambito professionale civile sia perché ritenute difficilmente applicabili ai sempre diversi problemi dello strutturista, sia perché gli strumenti atti a tale tecnica richiedono basi matematiche e di programmazione adeguate, ed infine perché in commercio non esistono in genere strumenti facilmente utilizzabili a tale scopo. Il presente lavoro individua un metodo operativo di progettazione basato su criteri di ottimo e ne valida il processo applicandolo alla progettazione di ponti in struttura mista acciaio-calcestruzzo ad asse rettilineo. Il metodo di progettazione proposto è caratterizzato dalla sinergia operativa di due software commerciali e di un codice interno; per quanto concerne gli applicativi commerciali si è adottato il codice FEM Straus7 (distribuito da HSH Srl) e l’ottimizzatore modeFrontier (ESTECO.Srl) in quanto facilmente reperibili in commercio e di largo impiego professionale. L’applicazione del metodo proposto è resa possibile dal software interno denominato AutoBiD (Automatical Bridges Design) mediante il quale viene automaticamente definito: l’asse teorico discretizzato dell’infrastruttura viaria; l’asse di progetto coerente ai vincoli normativi e realizzativi; il modello in ambiente FEM con impiego del software commerciale Straus7 e sue API (Application Programming Interface). Il codice esegue inoltre le verifiche di normativa sulla struttura in acciaio e predimensiona la soletta collaborante in calcestruzzo. Al termine delle analisi l’impalcato è valutato sulla base dei coefficienti di utilizzazione di ogni concio e sul peso complessivo della struttura in acciaio. Nel codice AutoBiD è stato implementato anche un software di ottimizzazione mediante algoritmi genetici di realizzazione interna e denominato ABiDEvoCOM (Automatical Bridges Design Evolutionary Algorithm), mediante il quale sono possibili ottimizzazioni locali e cicli di ricerca dell’ottimo globali mono obiettivo. La ricerca si conclude con la validazione del metodo applicato ad un caso studio.
XX Ciclo
1976
Ghermandi, Edoardo. "Ottimizzazione della soletta nei ponti in struttura mista acciaio-calcestruzzo." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Find full textFerri, Fabio. "Analisi numerica del comportamento di solai a struttura mista legno-calcestruzzo." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7619/.
Full textCantelli, Nicola. "Analisi statica e sismica di un ponte con impalcato a struttura mista." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amslaurea.unibo.it/2058/.
Full textFabbri, Giulia. "Nuovo ponte sul Reno a Bologna: studi per la progettazione dell'impalcato a struttura mista." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25845/.
Full textVassoi, Andrea. "Reforming dell'etanolo con processo ciclico: studio della reattività di ossidi misti con struttura spinello." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9313/.
Full textBrenni, Pietro. "Il comportamento al taglio di una struttura a sezione mista in calcestruzzo a getti successivi /." Basel ; Boston ; Berlin : Birkhäuser, 1995. http://e-collection.ethbib.ethz.ch/show?type=incoll&nr=829.
Full textBattista, Michele. "Verifiche di vulnerabilità sismica della Facolta di Fisica a Bologna." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6731/.
Full textCalletti, Matteo. "Progettazione strutturale di un ponte a sezione mista acciaio - calcestruzzo con sistema di isolamento." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
Find full textKdouh, Oussama. "Identificazione dinamica e calibrazione di un modello FEM di un ponte a struttura mista acciaio e calcestruzzo." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Find full textNICOLINI, ALESSIO. "EMAC (Extended Metal Atom Chains) a base di Ferro(II) come Magneti Molecolari: Sintesi, Struttura e Comportamento Magnetico." Doctoral thesis, Università degli studi di Modena e Reggio Emilia, 2021. http://hdl.handle.net/11380/1250760.
Full textThe annual size of the Global DataSphere (the total amount of data created across the world) has experienced an exponential increase during the last decade, and it will exceed 150 trillion of gigabytes within 2025. Storage, transfer and elaboration of data became one of the most appealing targets in emerging fields such as quantum technologies and spintronics (spin electronics). A primary goal is the control of magnetic properties and spin at the atomic and molecular level. Interesting are specific nanostructures called Single-Molecule Magnets (SMMs), which possess similar magnetic properties to those of bulk magnets but of pure molecular origin. SMMs can feature magnetic bistability and long relaxation times, which make them attractive to be implemented as single bits. Their physical properties can be tuned by chemical design. Iron(II)-based Extended Metal Atom Chains (EMACs) are appealing synthetic targets as SMMs, because of the large spin and magnetic anisotropy of high-spin iron(II). EMACs are linear arrays of at least 3 metal ions wrapped together by polydentate organic ligands, which promote short separations between the metal centers and, sometimes, metal-metal bonds. However, these compounds proved to be very elusive, due to the exceeding tendency of iron(II) to undergo oxidation and hydrolysis processes. In fact, before our report of a tetrairon(II) chain [Fe4(tpda)3Cl2] (1) based on oligo--pyridylamido ligand tpda2– in 2018, the only known iron(II)-based EMAC was a triiron(II) complex with formamidinato ligands (2) described by Cotton et al. in 1998. In 2020, Guillet et al. reported a new triiron(II) chain (3) supported by silylated diaminopyridines. Complexes 1, 2 and 3 exhibit ferromagnetic interactions, while 3 also contains metal-metal bonds. The aim of this Thesis was the design, the synthesis and the characterization of transition metal compounds with highly magnetic electronic states, containing ferromagnetic interactions and, possibly, metal-metal bonds. In particular, it describes a systematic study of a series of iron-based EMACs, obtained and handled in strictly anaerobic and anhydrous conditions. The novel synthesized compounds were firstly characterized by single crystals X-ray diffraction, to define their molecular structures with atomic precision. Afterwards, their properties were investigated in solution (mass spectrometry, electronic and NMR spectroscopy, cyclic voltammetry) and in solid state (Mössbauer spectroscopy, DC and AC magnetometry). The effect of replacing axial Cl– − with Br– ligands in 1 was firstly investigated. Complex [Fe4(tpda)3Br2] (4) exhibits dominant ferromagnetic coupling at room temperature and similar magnetic behavior to 1. Surprisingly, AC experiments pointed out a significant difference: although both 1 and 4 showed SMM behavior, slow magnetic relaxation in 4 was observable even in zero applied field. To attempt activating the double-exchange mechanism, which could strengthen the ferromagnetic interaction in mixed valent compounds, the chemical oxidation of 1 was carried out, isolating two linear triiron mixed-valence species: one- ([Fe2IIFeIII(tpda)3]PF6, 5) and two-electron oxidized ([FeIIFe2III(tpda)3Cl]PF6, 6). Variable temperature 57Fe Mössbauer and electronic spectra suggest that 5 is best classified as a Robin-Day Class II mixed-valence system at 298 K, while no delocalization occurs at 10 and 77 K. Furthermore, 5 exhibits zero-field SMM behavior. In order to better stabilize these chain like structures, a challenging new tripodal ligand, N(CH2CH2NH-Py-NH-Py)3, based on three covalently linked oligo-α-pyridylamido units, was designed and synthesized. Its coordination chemistry towards iron and cobalt was preliminary explored, although no new EMACs were obtained so far.
Ricci, Mattia. "Viadotto con impalcato a struttura mista: analisi lineare e non lineare in presenza di dispositivi di isolamento sismico di tipo pendolare." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5395/.
Full textCORNELI, ALESSANDRA. "Artificial Intelligence assisted Building Digitization using Mixed Reality." Doctoral thesis, Università Politecnica delle Marche, 2020. http://hdl.handle.net/11566/274488.
Full textFacility Management in complex buildings requires a large amount of information that can be stored in a functional building model. A functional building model is a structured representation of the building including information crucial for specific functions such as safety, refurbishment actions or operation and maintenance. Surveying this kind of data, such as technical properties of building components, is a costly process. For this reason, an advanced tool for engineering surveys is needed. Nowadays many studies still focus on capturing geometry, overlooking the fact that many recurring actions are conducted on assets inside buildings. Many systems proposed exploit highly accurate survey techniques, like laser scanning or photogrammetry, but they need long postprocessing efforts to interpret data collected. Moreover, these operations are not pursued on site leading to inaccuracies for the incorrect interpretation of data. Under these circumstances, the possibility of performing the majority of operation on-site would definitely make the process more efficient and it would reduce errors. This research proposes a system for digitization exploiting manmachine intelligence collaboration without post-processing. To this aim, Mixed Reality with its capability of interacting with real world is applied giving an environment for man-machine collaboration. The capability of Mixed Reality of overlapping digital data to the real environment makes possible checking data directly on site. For the object recognition process the system proposed in this research make use of Neural Network. YOLO (You Only Look Once) Neural Networks has been chosen for its speed and multiple detection features, ideal for real-time applications. The system has been developed and its performance evaluated for the detection of fire protection system components. First single Neural Network have been tested reaching always more than 85%of F1 factor. Then the whole embedded system proposed has been tested on site to prove its feasibility in a real-world scenario.
Pagano, Enrico. "La difesa dai terremoti: il sistema antisismico Baraccato." Doctoral thesis, 2019. http://hdl.handle.net/11589/161629.
Full textThe doctoral dissertation concerns about architectural heritage represented by the so-called “Baraccato” houses. The most ancient Baraccato structural system was defined by the Bourbon Government in the late 18th century and it represented the anti-seismic model for the reconstruction of several italian cities between 1783 and 1908. In such constructions the load-bearing system, composed by a timber-framed masonry infill, is the result of a "seismic memory" based on a experience and pratical knowledge whose scientific validity has been mostly verified only from an empirical point of view. For this reason, the main scope of the thesis was to assess the seismic efficiency of the constructive system by defining a specific mechanical model. In addition, the research deals with the analysis and description of the typological and morphological aspects that characterize the Baraccato houses found in some examples still existing in Calabria, a region in the South of Italy. One of the most emblematic buildings of this construction technique, the Episcopal Palace of Mileto, was analyzed in detail and has been the object of analysis of the mechanical model proposed. With reference to the research areas of interest described above, the thesis consists of three main parts: Historical and constructive analysis The first part explores the genesis and spread of the Baraccato technique with regard to similar examples, widespread in the territories of high seismic risk of Italy and more generally in the world. The research shows the constructive characteristic of the Baraccato building, identifying the anti-seismic quality. In addition to the "historical reconstruction" of the Baraccato technique, the first part of the thesis contains the results of a survey on existing heritage aimed at evaluating the extent of Baraccato heritage in different centres of Calabria and its conservation status. Mechanical analysis In the central part of the thesis, the mechanical model proposed for the analysis of the most ancient Baraccato system is shown. The aim was to translate the empirical intuitions that characterize the structural configuration of the Baraccato buildings with a modern scientific language. Through a multiscale mechanical analysis, a simplified modeling methodology has been defined to describe the complex mechanical phenomena that characterize the seismic behaviour of mixed wood and masonry structures. As a matter of fact, in a first phase a micro-mechanical analysis was carried out on a single Baraccato wall, already undergoing experimental tests at the CNR-Ivalsa Laboratory of Trento in 2013, which allowed the calibration of the mechanical parameters that characterize the wall elements, like wooden frame, connections and masonry. Subsequently, the simplified analysis approach, called EFM (Equivalent Frame Method), widely used in the literature for the study of masonry structures, has been implemented for the seismic analysis of an entire Baraccato building. Case study The last part of the thesis concerns about the study of an emblematic case of eighteenth-century Baraccato house. In particular, the Bishop palace of Mileto (South Italy), because of its enormous historical, cultural and constructive value, was chosen as the subject of a specific study, aimed at application and validation of mechanical model defined. In addition, the poor state of conservation of the building has allowed to detect the original construction solutions, providing a rare testimony of the original Baraccato technique. As a matter of fact, in order to avoid the complete loss of the Bishop's Palace, affected by several collapses and acts of vandalism in the last few years, the thesis contains the results of a recovery activity, material and cultural life, promoted by the Architecture Department of Rome Tre University, which has recently led to the beginning of a procedure for affixing the architectural constraint on the Palace, which should guarantee its definitive preservation and enhancement.