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RCC Structures Design

RCC Structures Design
The pitch of the main bars in a simply supported slab, should not exceed its effective depth by

Six times
Five times
Three times
Four times

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RCC Structures Design
An R.C.C. beam of 6 m span is 30 cm wide and has a lever arm of 55 cm. If it carries a U.D.L. of 12 t per m and allowable shear stress is 5 kg/cm², the beam

Is safe in shear
Needs revision of section
Is safe with stirrups
Is safe with stirrups and inclined bars

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RCC Structures Design
Long and short spans of a two way slab are ly and lx and load on the slab acting on strips parallel to lx and ly be wx and wy respectively. According to Rankine Grashoff theory

(wx/wy) = (ly/lx)²
(wx/wy) = (ly/lx)
(wx/wy) = (ly/lx)⁴
None of these

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RCC Structures Design
If W is total load per unit area on a panel, D is the diameter of the column head, L is the span in two directions, then the sum of the maximum positive bending moment and average of the negative bending moment for the design of the span of a square flat slab, should not be less than

WL/10 (L + 2D/3)²
WL/10 (L - 2D/3)²
WL/12 (L - D/3)²
WL/12 (L - 2D/3)²

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RCC Structures Design
Columns may be made of plain concrete if their unsupported lengths do not exceed their least lateral dimension

Five times
Two times
Three times
Four times

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RCC Structures Design
If ‘p’ is the net upward pressure on a square footing of side ‘b’ for a square column of side ‘a’, the maximum bending moment is given by

M = pb (b - a)²/4
M = pb (b - a)²/8
M = pb (c - a)/4
M = pb (b + a)/8
M = pb (b + a)/8

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