1,721,183 research outputs found
Una scheda per Emilio Girardini
No full textProfilo dello scrittore Emilio Girardini (Udine 1858 - 1946), poeta, drammaturgo, traduttore (dal greco, dal francese e dall'inglese). Con cenni essenziali della biografia e una sintetica analisi dell'opera
Static and seismic performances of R.C. shear walls cast into wood chip and cement formworks - Experimental tests, theoretical interpretation and numerical validations
Full text linkThe purpose of this thesis is to study the behavior of the particular building system that makes use of load-bearing walls of reinforced concrete cast into mineralized wood. This construction system has been studied under the action of pseudo-static forces (experimentally and numerically) and under dynamic forces (only numerically). The activities carried out, in general, employed experimental equipment for the realization of tests on materials and on specimens that can be both portions and real scale walls. Additionally, a commercial software has been used for the numerical modeling of the elements composing the construction system in object. In particular, in the first chapters of the thesis, a complete analytical treatment based on experimental results obtained in the years before the Ph.D beginning and during the Ph.D is provided. The original aspects, from the experimental point of view, were the two experimental campaigns concerning portions of panel subjected to direct shear and real scale walls subjected to cyclic horizontal forces in a pseudo-static fashion. In addition, the experimental campaign was completed with the tests on wall-to-wall and wall-to-floor connections required by LL. GG. Min. of Public Works (2011) and aimed at the study of load-bearing walls cast within formwork blocks. The direct shear tests have shown an incongruity of the experimental results with the first analytical treatment developed in the years before 2012 and therefore it was necessary to revise it with new theoretical considerations. A new and original analytical treatment based on strut-and-tie mechanisms was developed. In the last chapters, the construction system has been treated numerically. In the numerical modeling of the structural system the analytical treatment exposed in the first chapters was employed using elements with lumped and distributed plasticity able to simulate the main failure mechanisms documented in the experimental tests. This modeling was first validated on the results of tests on full-scale walls and then used to simulate the behavior of multi-story buildings, regular and irregular, with bi-dimensional and spatial models. These buildings have been subjected to static and dynamic forces typical of seismic action. The numerical results of the simulations coupled with the capacity curves enabled the estimate of the seismic response of the building system and, finally, the behavior factor which best synthesizes it. The estimate of this parameter is of fundamental importance in seismic design, it is one of the main research results. It is worth to notice that the Italian Guidelines prescriptions regarding the behavior factor are more conservative with respect to the results of this researc
La gestione dei rifiuti in un'ottica di sviluppo sostenibile: aspetti tecnici e normativi per la valutazione della qualità dei processi di compostaggio e del compost: sistemi attuali e prospettive future
No full textIndagini sperimentali su pareti in calcestruzzo armato realizzate con blocchi cassero in legno mineralizzato
No full textEsecuzione e interpretazione di prove sperimentali su pareti realizzate con tecnologia "ISOSPAN".
Full text linkIn recent years, the resistance of reinforced concrete bearing panels structures has been the object of several research works, to assess the effective behavior of this kind of materials in static and seismic situations. Despite the wide use of this kind of concrete walls in Northern Europe the national regulations are not very detailed and specific. In fact, regarding the structural elements without reinforcement or partially reinforced employed in the industrial buildings, there are no common methods or approved procedures to calculate the strength of this kind walls, both Italian and European (Eurocodes) regulations. In order to partially fill this gap the Italian Ministry of Public Works issued some Guidelines in the July 2011 concerning the construction technique in object, where a series of laboratory tests should be carried on to investigate the mechanical properties (Young and shear moduli) and the panels behavior under different loads and with different geometries. This paper presents a summary of the experimental results of some tests conducted following the above Guidelines and the comparison of these with the analytical results of a proposed procedure
Seismic behavior of buildings with R.C. shearwalls cast into hollow mineralized wood-chip formworks
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Benjamin Graham : ¿sigue siendo válida su filosofía de inversión?
Full text linkEn este trabajo se busca comprobar si sigue siendo válida en nuestros tiempos la filosofía de inversión de Benjamin Graham. Se hace una selección de acciones de distintos países del mundo desde 2012 siguiendo sus criterios de inversión, luego se arman portafolios de distinta duración, se calculan sus retornos totales y se los contrasta con los retornos totales de los índices de mercado correspondientes. Luego se realiza una prueba de hipótesis usando estadístico t de Student para verificar si los resultados son significativos. Este trabajo concluye que con los criterios de selección de acciones de Benjamin Graham no podemos descartar estadísticamente obtener resultados iguales o menores a los del mercado, por lo tanto, no podemos validar sus criterios de inversión en la actualidad con las muestras analizadas
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