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Question

For a proposed building, raft foundation, isolated footings and combined footings are being considered. These foundations are to be listed in the decreasing order of preference in terms of performance. Which one of the following is the correct order of listing?

A
Raft foundation - Combined footings -Isolated footings
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B
Isolated footings - Raft foundation -Combined footings
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C
Combined footings - Raft foundation - Isolated footings
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D
Combined footings - Isolated footing - Raft foundation
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Solution

The correct option is A Raft foundation - Combined footings -Isolated footings
  • Isolated foundation is provided to support an individual column.
  • Combined footing is used when two columns are so close to each other that their individual footings would overlap each other.
  • Raft foundation is a large slab supporting a number of columns and walls under the entire structure or a large part of the structure.

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