Aluminium Design and Construction John Dwight

Table 7.4 Slender reinforced elements, effective width formulae
Notes: 1. Refer to Figures 7.20, 7.21.
2. � is as defined in Section 7.3.1.
3. � 1 and � 0 are found by entering the relevant curve in Figure 7.6 or 7.7 at the value of � listed in
final column.
4. � 1 , � 0 and ß’ are as defined in Section 7.4.5.
5. where � 0 is in N/mm2.
6. g=0.7+0.3� for � -1,=0.8/(1-�) for ��-1
Table 7.4 provides expressions which enable the stress block width
or widths for pattern B to be found directly for the various cases. When
the total effective width thus calculated exceeds the plate width, this
means that pattern B no longer applies and pattern A becomes valid
instead. The ‘overflow’ then defines the width of the effective part of
the stiffener. In other words, c e in pattern A is taken as the amount by
which the total effective width, as calculated using the pattern B formulae,
exceeds the actual plate width.
It will be seen that the pattern B formulae involve the coefficient � 1
or � 0 which may be calculated from equation (7.5) or (7.7), or read from
Figure 7.6 or 7.7. In so doing, the parameter � should be taken as in the
last column of the table.
If an element is welded along its connected edge or edges a reduced
thickness of k z t is taken in the HAZ, as usual.
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