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Fig. 52: Notes for using this chart

With a high load (dead and imposed loads) use the maximum value for the member depth as proposed by the chart - vice versa for a low load. The sizes and relationships shown cannot be verified scientifically. The shaded areas are supposec to be slightly "indefinite". In the interest of the rational use of a loadbearing element, the "edges' of this chart should be avoided.

Element

(loadbearing)

Rafter

Purlin, beam Solid-web beam Lattice beam

*A beam cross-section (h/b = 2/1) can be used for the initial, rough sizing; Glulam beams are often more slender.

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Project Management Made Easy

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