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Single-Storey Frames, Shells and Lightweight Coverings 197<br />

Flat glulam timber portal frame<br />

The flat portal frame illustrated in Figure 4.40 is designed for the most economic use of<br />

timber and consists of a web of small section timbers glued together with the top and<br />

bottom booms of glued laminate with web stiffeners. The portal frames are used to support<br />

metal decking on the roof and profiled sheeting on the walls. This long-span structure is<br />

lightweight and free from maintenance.<br />

25 flange boards<br />

glued and nailed<br />

Fire protection boards cut away<br />

to show web boards<br />

25 horizontal boards nailed to<br />

web as fire protection<br />

50 × 50 web<br />

stiffeners<br />

25 flange boards<br />

glued and nailed<br />

32 diagonal web<br />

boards nailed<br />

together<br />

Web boards<br />

Of portal<br />

frame<br />

3.2<br />

Steel splice plate<br />

25 horizontal<br />

boards<br />

Clear span<br />

45.0<br />

Joint<br />

Joint<br />

3.0<br />

10.0<br />

825<br />

32 diagonal web<br />

boards nailed<br />

together<br />

25 vertical boards<br />

nailed to web as<br />

fire protection<br />

50 × 50 web<br />

stiffeners<br />

Steel shoe<br />

Glued and nailed<br />

laminated<br />

flange<br />

Glued and nailed<br />

laminated<br />

flange<br />

Figure 4.40 Glued and nailed timber portal frame.

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