56.
If p1 and p2 are mutually perpendicular principal stresses acting on a soil mass, the normal stress on any plane inclined at angle $${\theta ^ \circ }$$ to the principal plane carrying the principal stress p1, is:

57.
The width of the rib of a T-beam, is generally kept between

59.
The thickness of base slab of a retaining wall generally provided, is

60.
Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than

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