Column bases are structural elements used in the design of steel structures to transfer the column load to the footings.
Types of Column bases:
1) Slab base
2) Gusseted base
Slab Base
- Slab bases are used where the columns have independent concrete pedestals.
- A thick steel base plate and two cleat angles connecting the flanges of the column to the base plate.
- In addition to these, web cleats are provided to connect the web of the column to the base plate.
- These web cleats guard against the possible dislocation of the column during erection.
- The ends of the column and also the base plate should be mechanized so that the column load is wholly transferred to the base plate.
- Area of base plate= (load of column)/(permissible bearing stress in concrete)
Gusseted base
Gusseted Base
- These bases are provided for columns carrying heavier loads requiring large base plates.
- A gusseted base consists of a base of reduced thickness and two gusseted plates are attached one to each flange of the column.
- The gusseted plates, cleat angles and fastenings (bolts, rivets) in combination with bearing area of shaft shall be sufficient to take all loads.
Originally posted 2009-12-15 06:01:45.
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