Rules for members

Clauses 7.6.1(4), 7.6.4(9), 7.6.4(10), 7.6.5(4), 7.6.5(5), 7.6.5(6)

• Table 7.3 in EN 1998-1, which provides the limits for flange outstands to be met, for a structure to belong to a ductility class.

• Clauses 7.6.4(9) and 7.6.4(10) for fully encased profiles and clauses 7.6.5(4) to 7.6.5(6) for partially encased profiles, allowing for an increase in the limits of flange slenderness of encased H profiles by mitigating their buckling. The limits can be increased by up to 50% by means of specific measures: additional stirrups for fully encased profiles and additional straight bars welded to the inside of the flanges for partially encased profiles (see Fig. 7.8 in EN 1998-1).

Table 7.1 summarizes the values of wall slenderness corresponding to different composite design options for columns made of H or I sections. In this table, flanges and webs are

Some general rules are valid for all types of members: beams, columns or diagonals.

For members in tension, reference is made to the rule of Eurocode 3 for steel sections;83 the effect of drilled holes has already been explained in Section 6.7.

The dissipative character of composite structural elements first imposes limitations on the slenderness of walls of the steel sections in relation to the ductility class intended for the structure. These limits are defined in:

assumed to be fully in compression; 'plus web connected' refers to clause 5.5.3(2) in Eurocode 4,82 'plus hoops or straight links' refers to clauses 7.6.4(9), 7.6.4(10), 7.6.5(4) and 7.6.5(5) of EN 1998-1.

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