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RCC Structures Design

RCC Structures Design
Dimensions of a beam need be changed if the shear stress is more than

10 kg/cm²
20 kg/cm²
15 kg/cm²
25 kg/cm²

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RCC Structures Design
If ‘A’ is the sectional area of a pre-stressed rectangular beam provided with a tendon pre-stressed by a force ‘P’ through its centroidal longitudinal axis, the compressive stress in concrete, is

P/A
A/P
P/2A
2A/P

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RCC Structures Design
If L is the effective span of a R.C.C. beam which is subjected to maximum shear qmax at the ends, the distance from either end over which stirrups for the shear, are provided, is

(L/2) (1 - 3/qmax)
(L/2) (1 - 5/qmax)
(L/3) (1 - 5/qmax)
(L/2) (1 - 2/qmax)

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RCC Structures Design
An under-reinforced section means

Steel provided is insufficient
Steel will yield first
Steel provided on one face only
Steel is provided at the underside only

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RCC Structures Design
If d is the diameter of a bar, ft is allowable tensile stress and fb, is allowable bond stress, the bond length is given by

ft .d/4fb
π ft .d²/fb
(π/4). (ft .d/fb)
(π/4). (ft .d3/fb)

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RCC Structures Design
If p1 is the vertical intensity of pressure at a depth h on a block of earth weighing w per unit volume and the angle of repose φ, the lateral intensity of pressure p2 is

wh (1 - tan φ)/(1 + tan φ)
wh (1 - sin φ)/(1 + sin φ)
w (1 - cos φ)/h (1 + sin φ)
wh (1 - cos φ)/(1 + sin φ)

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