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RCC Structures Design

RCC Structures Design
Piles are usually driven by

Drop hammer
Single acting steam hammer
Diesel operated hammer
All listed here

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RCC Structures Design
The neutral axis of a T-beam exists

Below the slab
All listed here
At the bottom edge of the slab
Within the flange

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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

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

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

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RCC Structures Design
In the zone of R.C.C. beam where shear stress is less than 5 kg/cm², nominal reinforcement is provided at a pitch of

Lever arm of the section
One and half lever arm of the section
One-third lever arm of the section
One-half lever arm of the section

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RCC Structures Design
A singly reinforced concrete beam of 25 cm width and 70 cm effective depth is provided with 18.75 cm² steel. If the modular ratio (m) is 15, the depth of the neutral axis, is

20 cm
35 cm
30 cm
25 cm

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