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In a staircase Design with open well, where spans partly crossing at right angles occurs and flights are embedded into walls for sufficient length, by what unit its effective breadth is to be increased for design purpose as per IS code?

In a staircase Design with open well, where spans partly crossing at right angles occurs and flights are embedded into walls for sufficient length, by what unit its effective breadth is to be increased for design purpose as per IS code? Correct Answer 75 mm

As per IS 456, where flights or landings are embedded into walls for a length of not less than 110 mm and are designed to span in the direction of the flight, a 150 mm strip may be deducted from the loaded area and the effective breadth of the section increased by 75 mm for purposes of design.

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