By Federico M. Mazzolani (eds.)
The topic of the ebook is the layout of aluminium alloys constructions. the topic is taken care of from diversified issues of view, like expertise, idea, codification and functions. Aluminium alloys are effectively hired within the transportation undefined; A parallel development has been saw within the final many years in civil engineering constructions, the place aluminium alloys compete with metal (long-span roofing, bridges, hydraulic constructions, offshore superstructures). This quantity collects the lectures of out-standing foreign specialists, who're all interested by the codification task of Eurocode nine on Aluminium Structural layout. It illustrates, with specific connection with the fields of transportation and civil engineering, the elemental layout ideas from the cloth homes and the technological elements in their software, to the review of the resistance of the structural components (member and plates) lower than static, dynamic and fatigue loading conditions.
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Extra info for Aluminium Structural Design
The structure is solved by means of a concentrated plasticity approach based on the concept of plastic hinge. The maximum required strain can be evaluated provided that as convenient length for the plastic hinge is assumed. The ductility demand is defined as the required rotation in the most developed plastic hinge evaluated when the plastic hinge idealisation provides the same load bearing capacity as predicted by a more accurate, inelastic method of analysis based on a discretised model. In this case the structure should be solved by means of both methods, in order to compare the obtained results.
For Aluminium Structures it has been codified for the first time according to the general roles which assess the fire resistance on the bases of the three criteria: Resistance (R), Insulation (J) and Integrity (E). As it is weH known, aluminium alloys are generally less resistant to high temperatures than steel and reinforced concrete. Nevertheless, by introducing rational risk assessment methods, the analysis of a [ITe scenario may in some cases results in a more beneficial time-temperature relationship and thus makes aluminium more competitive and the thermal properties of aluminium aHoys may have a beneficial effect on the temperature development in the structural component (Forsen, in Mazzolani, 1995).
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.