Welding Fabrication Standards - EWF

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Welding Fabrication Standards Page 74 The load bearing capacity for a component shall refer to the specified actions and combination of actions, referring to situations for which the loads are predominantly static such that the influence of repetitive loads need not be considered. The fatigue strength for steel components shall be determined in accordance with EN 1993 (Eurocode 3) for steel structures and with EN 1999 (Eurocode 9) for aluminium components and are usually expressed by reference to S-N diagrams. The resistance to fire shall be determined according to the relevant part of Eurocodes. In conclusion, the standards does not give specific guidance for the design, as the structural characteristics shall be determined in accordance the relevant Eurocodes, as follows: - EN 1990 (Eurocode 0) - Basis of structural design; - EN 1991 (Eurocode 1)- Actions on structures; - EN 1993 (Eurocode 3)- Design of steel structures, for steel components; - EN 1994 (Eurocode 4)- Design of composite structures of steel and concrete, for the steel parts; EN 1999 (Eurocode 9)- Design of aluminium structures, for aluminium components. Figure 24 – Workshop for bridge manufacturing. Istituto Italiano della Saldatura Lungobisagno Istria, 15 - 16141 Genova (I) - Tel. 01083411 - Fax 0108367780
Welding Fabrication Standards Page 75 8.3 EN 1090 – 2: Technical requirements for the execution of steel structures This European Standard specifies general requirements for execution of structural steelwork. The pursued objective during the realization of a project of structure is to control risks connected to it by controlling possible execution defects. Nature and extend of risks being specific in every structure according to its purpose and complexity, execution classes are specified in this European Standard, to which correspond execution requirements with different severity levels. In accordance with EN 1990:2001, which defines consequence classes in its annex B for the purpose of reliability differentiation, three different consequence classes for structural elements are distributed in three levels noted as CC1, CC2 and CC3. The consequence classes of the elements of a structure may be indicated on the basis of indications given in table 17. Consequences Class CC3 CC2 CC1 Description High consequence for loss of human life, or economic, social or environmental consequences very great Medium consequence for loss of human life, economic, social or environmental consequences considerable Low consequence for loss of human life, and economic, social or environmental consequences small or negligible Table 17 – Definition of consequences classes Examples of buildings and civil engineering works Grandstands, public buildings where consequences of failure are high (e.g. a concert hall) Residential and office buildings, public buildings where consequences of failure are medium (e.g. an office building) Agricultural buildings where people do not normally enter (e.g. storage buildings), greenhouses It should be noted that a same work, or part of it, can contain elements with different consequence classes. Moreover, in the definition of requirements for the product (and for the Manufacturer) also the use condition of the component shall be considered (execution and use); as a consequence the standard defines the execution categories, based on the table 18. Istituto Italiano della Saldatura Lungobisagno Istria, 15 - 16141 Genova (I) - Tel. 01083411 - Fax 0108367780
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Welding Fabrication Standards - EWF

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