Portal frame: Difference between revisions
No edit summary |
No edit summary |
||
| Line 1: | Line 1: | ||
{{Review}} | |||
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. | |||
Small single storey industrial buildings can also be constructed | Cladding materials include built-up cladding systems (as shown), composite cladding panels, and masonry. | ||
using light steel sections for the columns and rafters | |||
Small single storey industrial buildings can also be constructed using light steel sections for the columns and rafters | |||
[[Approximate structural sizing]] | [[Approximate structural sizing]] | ||
Latest revision as of 02:48, 7 March 2010
Review
This page is pending editorial review. (all)
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