1,721,231 research outputs found
Ruolo dell'acciaio ed esigenze di ricerca nelle grandi architetture
No full textLa Relazione sulla Ricerca, presentata in apertura del XXII Congresso C.T.A., si articola in due parti: un quadro della ricerca italiana sulle strutture in acciaio, delineato a partire da una sintetica rassegna dei lavori presentati al congresso, limitata alle tematiche più studiate; una discussione sul ruolo delle strutture in acciaio e sulle esigenze di ricerca che emergono dal panorama delle grandi architetture contemporanee, espressioni dell’Archi-star System: dall’analisi critica dello stato dell’arte e della pratica, e dall’illustrazione di casi studio, si traggono alcune considerazioni sul ruolo della struttura, individuando tendenze e approcci progettuali, potenziali sviluppi futuri, opportunità e necessità di innovazione, gli aspetti cioè per i quali emergono esigenze di ricerc
La Ricerca sulle strutture in acciaio
No full textRelazione generale ad invito, XXII Congresso CTA (parte I
MOMENT RESISTING WELDED CONNECTIONS: AN EXTENSIVE REVIEW OF DESIGN PRACTICE AND EXPERIMENTAL RESEARCH IN USA, JAPAN AND EUROPE
No full textMoment resisting welded connections: an extensive review of design practice and experimental research in Usa, Japan and Europe
No full textDiagrid: the renaissance of steel structures for tall buildings - geometry, design, behavior
No full textI Residui del trattamento di potabillizzazione delle acque come adsorbenti dell'arsenico in suoli contaminati
Full text linkIn this study we determined, at different pH values (pH 4, 7 and 9), the ability of a Fe- and an Al-based water treatment residues (WTRs) to accumulate As(V) from an aqueous solution and to define the mechanisms which regulate the sorption of this anion. The Fe-WTR showed a greater As(V) sorption capacity with respect to Al-WTR at all the pH values studied [e.g. 1.65 mmol•g-1and 1.02 mmol•g-1of As(V) sorbed at pH 4 respectively]. Sequential extraction of As(V)-WTR suggests that the main mechanism governing the sorption of As(V) likely involved the formation of inner-sphere surface complexes [Fe/Al–O–As].The capacity of Fe- and Al-WTR to decrease the mobility and bioaccessibility of As in a polluted sub-acidic soil (~2267 mg•kg-1d.m.) was also evaluated. The addition of both sorbents at two application rates (1 and 2% w/w) induced a shift of the labile As fractions towards different ones more strongly retained by the components of WTRs (particularly by the Fe/Al amorphous (hydr)oxides), with the consequent decrease of the As mobility. All the treatments favoured a decrease (even if not significantly) of As bioaccessibility, evaluated through the SBET (stomach phase extraction at pH 1.5) and the SBRCG (intestinal phase extraction at pH 7.0) analyses, which simulate the gastrointestinal processes.The results presented show that both WTRs can be useful at decreasing the mobility and bioaccessibility of As, so favouring a certain recovery of the functionality of polluted soil
Form Structure Inte(g)ration
No full textIn this paper a discussion on form ??? structure interaction is presented from a structural engineering perspective. In particular, starting from a critical review of the state of the art and of the practice, the author focuses to the illustration of some paradigmatic case stu-dies, namely the Headquarters of China Central Television CCTV, the Bird's Nest Olympic Stadium, and the Water Cube Olympic pool, all realized in Beijing for the 2008 Olympic games; on the basis of the analysis of these architectures, some general considerations are finally drawn on the role of the structure and of structural design, identifying trends and approaches, potential future developments, opportunities and needs for innovation, i.e. the aspects worth of research efforts
Cyclic tests on bolted and welded beam-to-column connections
No full textSpecial Issue "Experimental Techniques
Cyclic tests on bolted and welded beam-to-column connections
No full textSpecial Issue "Experimental Techniques
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