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RCC Structures Design

RCC Structures Design
If the average bending stress is 6 kg/cm² for M 150 grade concrete, the length of embedment of a bar of diameter d according to I.S. 456 specifications, is

48 d
38 d
28 d
58 d

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RCC Structures Design
In a cantilever retaining wall without a heel slab

Base slab is made 10 cm thicker than the stem
Width of the base slab is kept 0.7 time the total height of the wall
All listed here
Thickness of the stem is kept same throughout

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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

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

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RCC Structures Design
In a pre-stressed member it is advisable to use

High strength concrete only
High strength concrete and high tensile steel
Low strength concrete but high tensile steel
Low strength concrete only

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RCC Structures Design
If the ratio of long and short spans of a two way slab with corners held down is r, the actual reduction of B.M. is given by

(5/6) (r/1 + r²) M
(5/6) (r²/1 + r³) M
(5/6) (r²/1 + r⁴) M
(5/6) (r²/1 + r²) M

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RCC Structures Design
[A + (m - 1)ASC] known as equivalent concrete area of R.C.C. is given by

None of these
Modular ratio method
Ultimate load method
Load factor method

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