By Federico M. Mazzolani (eds.)
The topic of the publication is the layout of aluminium alloys constructions. the topic is handled from diverse issues of view, like know-how, concept, codification and functions. Aluminium alloys are effectively hired within the transportation undefined; A parallel development has been saw within the final a long time in civil engineering constructions, the place aluminium alloys compete with metal (long-span roofing, bridges, hydraulic buildings, offshore superstructures). This quantity collects the lectures of out-standing foreign specialists, who're all curious about the codification job of Eurocode nine on Aluminium Structural layout. It illustrates, with specific connection with the fields of transportation and civil engineering, the fundamental layout rules from the fabric homes and the technological features in their program, to the overview of the resistance of the structural parts (member and plates) lower than static, dynamic and fatigue loading conditions.
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16. It has already been observed that the behaviour of mild steel is a particular case of this forrnulation, and with n ---+ 00 the cr-E curve is independent of the value of co' In practice, values of n greater than 100 are enough to provide an elastic-perfectly plastic curve. m-. ) n=8 n=8 12 120 b) (0 = O,1Y. 1 1/ rif. Al 0 I a ( a)" 1 (=[+(0 ~ I • 0 I r if. 11. 1. 33 The Structural imperfections Definition of industrial bar The definition of "industrial bar", used for the first time for the steel structures during the 1960s, details the unavoidable imperfections produced during the fabrication process of structural components.
Usually aluminium needs no protection against atmospheric or chemical corrosive agents. In contrast to steel, in which the corrosion process in not naturally inhibited (apart from self-protecting steels), corrosion processes in aluminium tend to cease naturally. In general, corrosion can be divided into two classes: when corrosion damages the aesthetics of the structure, and when corrosion damages the safety of structure. Corrosion in aluminium can be considered to belong to the first type. This fact can be explained from an electrochemical point of view.
I', ,. I " ~ " ", f 12 I , 13 14 " .. 13: The "strength rating" Further observations regarding aluminium alloy structures have to be pointed out: • The structures in aluminium alloys are more sensitive to thermal variations because the coefficients of thermal expansion of this metal is twice that of steel. This fact has to be taken into account when designing support apparatus; • Residual stresses produced by constraining thermal deformations are about 30 percent lower than those in steel structures, because they are proportional to the product aE; • Aluminium alloy structural components can be manufactured by rolling, extrusion, casting and drawing processes.