Column Bases | Design of Steel Structures




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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 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

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.
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Originally posted 2009-12-15 06:01:45.

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