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State the conditions under which the following foundations are preferred: a) Isolated. b) Combined. c) Raft
raft foundation • 610  views
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Isolated footing:

  1. Isolated footings are provided under each column.
  2. These may be square, rectangular or circular in plan.
  3. This type of footing is preferred when only single column is appearing in the foundation plan of a particular project.

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Combined footing:

  1. Combined footing supports two or more column loads.
  2. These may be continuous with rectangular or trapezoidal in plan.
  3. Need: - i) When the isolated footing overlaps. ii) When the exterior column is close to the property line such that isolated footing cannot be provided.

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