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RCC Structures Design

RCC Structures Design
Minimum spacing between horizontal parallel reinforcement of the same size should not be less than

One diameter
2.5 diameters
3.5 diameters
3 diameters

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RCC Structures Design
With usual notations the depth of the neutral axis of a balanced section, is given by

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

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

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RCC Structures Design
If longitudinally spanning stairs are casted along with their landings, the maximum bending moment per metre width, is taken as

wl24
wl28
wl210
wl212

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RCC Structures Design
The maximum ratio of span to depth of a slab simply supported and spanning in two directions, is

30
35
40
25

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RCC Structures Design
In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the consequent rebound is measured. For a safe pile, the net settlement (i.e. total settlement minus rebound) per tonne of test load should not exceed

15 mm
25 mm
20 mm
10 mm

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