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Question
In jack arch floor, the rise is kept
A.
1/6th of the span
B.
1/8th of the span
C.
1/12th of the span
D.
1/10th of the span
Answer ( Option C)

1/12th of the span

Solution

Jack arch: 
• Jack arch floor is brickwork arche supported by steel beams. 
• Jack arch slabs have long been used extensively to floor and roof houses in Iraq, especially in the middle and south. 
• The rise of the jack arch floor is kept 1/12th of the span.

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