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RCC Structures Design

RCC Structures Design
On piles, the drop must be at least

80 cm
123 cm
120 cm
124 cm

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RCC Structures Design
In a doubly-reinforced beam if ‘c’ and ‘t’ are stresses in concrete and tension reinforcement, ‘d’ is the effective depth and ‘n’ is depth of critical neutral axis, the following relationship holds good

(m + c)/t = n/(d + n)
mc/t = (d - n)/t
(t + c)/n = (d + n)/n
mc/t = n/(d - n)

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RCC Structures Design
A pre-stressed rectangular beam which carries two concentrated loads W at L/3 from either end, is provided with a bent tendon with tension P such that central one-third portion of the tendon remains parallel to the longitudinal axis, the maximum dip h is

WL/4P
WL/2P
WL/3P
WL/P

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RCC Structures Design
In a simply supported slab, alternate bars are curtailed at

1/6th of the span
1/5th of the span
1/4th of the span
1/7th of the span

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RCC Structures Design
If the tendon is placed at an eccentricity e below the centroidal axis of the longitudinal axis of a rectangular beam (sectional modulus Z and stressed load P in tendon) the stress at the extreme top edge

Is increased by PZ/e
Is decreased by Pe/Z
Is increased by Pe/Z
Remains unchanged

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RCC Structures Design
The maximum shear stress (qmax) in a rectangular beam is

1.50 times the average
1.75 times the average
1.25 times the average
2.0 times the average

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