Steel design: Difference between revisions
(New page: '''== Preliminary Sizing of Elements ==''' '''Portal frame''' Steel portal frames are capable of spanning large distances. They are used in the construction of factories and warehouses, ...) |
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'''== Preliminary Sizing of Elements ==''' | '''== Preliminary Sizing of Elements ==''' | ||
'''Portal frame''' | '''Portal frame''' | ||
Steel portal frames are capable of spanning large distances. They are | Steel portal frames are capable of spanning large distances. They are | ||
used in the construction of factories and warehouses, and other low-rise | used in the construction of factories and warehouses, and other low-rise | ||
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Small single storey industrial buildings can also be constructed | Small single storey industrial buildings can also be constructed | ||
using light steel sections for the columns and rafters | using light steel sections for the columns and rafters | ||
[[Approximate structural sizing]] | |||
ROOF BEAMS (RAFTERS) | |||
Typical span = 20-50 m | |||
Beam depth = Span/60 | |||
Cold formed rafters span up to 18 m | |||
COLUMNS | |||
Column depth = 1.25 x roof beam | |||
Width = as UB sections | |||
Revision as of 13:24, 23 October 2007
== Preliminary Sizing of Elements ==
Portal frame
Steel portal frames are capable of spanning large distances. They are used in the construction of factories and warehouses, and other low-rise buildings that require wide spans. Wall and roof bracing is normally provided in selected bays, often at the end of buildings. Additional vertical column or beam sections may be introduced at the gables (wind posts) to support cladding on end walls.
Roof beams (rafters) and columns are usually fabricated from rolled steel sections, while purlins and cladding rails are usually in light steel sections. Liner trays may be used as an alternative to cladding rails.
Cladding materials include built-up cladding systems (as shown), composite cladding panels, and masonry.
Small single storey industrial buildings can also be constructed using light steel sections for the columns and rafters
ROOF BEAMS (RAFTERS)
Typical span = 20-50 m
Beam depth = Span/60
Cold formed rafters span up to 18 m
COLUMNS
Column depth = 1.25 x roof beam
Width = as UB sections