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ROOF TRUSS ANALYSIS Definitions: Span Pitch Bay length
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usually express in terms of panel length Height of truss over span. Most economical pitch is = ¼ Distance center to center of trusses
Deadloads !eight !e ight of roof covering " #$ sheets% ceramic roofings% etc. & • !eight of steel purlins • 'nit (eight varies from )* + ,,* Pa of roof surface.he lo( values for light loads and short span et(een roof trusses. !eight of roof trusses • !eight of roof trusses is distriuted e/ually to 0oints on 1 and B1 or (eight is distriuted ,23 on 1 0oints and 423 on B1 0oints. 5mpirical 6ormula7
WT = 35.9 ( 1 + L/3.!" #
" Steel Truss &
Other Deadloads: o !eight of Bracings !eight of racings may e assumed to vary from 8) Pa to 4** Pa of roof surface. !eight !e ight of ceiling if any o !eight !e ight of ceiling 0oist if any o
Miscellaneous loads Balcony load if there is any • Shafting if there is any • 9ther ceiling loads if there is any • Tributary Tributary AreaArea Pro0ected area in a structure to (hich actual loadings are assumed to e distriuted.
