Answer Happy

Figure 28 shows the roof truss of a pub in Bathurst, New South Wales. The truss is made from Seasoned Karri of Grade F34. The bottom chord of the truss has a of 290x45mm. cross-section For design against bending, the bottom chord of the truss can be assumed to carry a uniformly distributed load over a simply supported design span of 9m. The diagonal and vertical locations on the bottom chord can be considered to be lateral restraints acting on the top edge of the bottom chord. For design, the bottom chord can be assumed to bend in isolation and not linked to bottom chords in adjacent trusses that are at 4m distances on either side of the truss under consideration. Use the following unfactored loads on the bottom chord to determine your design action effects: (a) Permanent action due to gravity loads = 4kN/m and (b) Wind uplift (reversal) = 6kN/m. Check if the bottom chord has sufficient capacity in bending.
[email protected]=9m Figure 2B