Aluminium Design and Construction John Dwight

Figure 7.19 Slenderness adjustment factor for reinforced elements: internal elements
outstands � 0 .
(7.20a)
(7.20b)
When c � t the value of p is taken as unity, because the reinforcement
then provides no benefit.
With non-standard reinforcement, the procedure is to find c for the
equivalent standard stiffener and then determine � as above.
7.4.6 Classification
The classification (Section 7.1.4) of reinforced elements is performed
simply by relating ß’ (instead of ß) to the appropriate limiting value
used for plain elements, In other words, ß’ is compared with ß f or ß s as
given by:
Uniform compression Table 7.1
Strain gradient, internal element Figure 7.10
Strain gradient, outstand Figure 7.14
For elements found to be fully or semi-compact, the full area is effective,
including that of the stiffener, except where a local reduction is made
at a welded edge to allow for HAZ softening.
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