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RCC Structures Design

RCC Structures Design
The allowable tensile stress in mild steel stirrups, reinforced cement concrete, is

260 kg/cm²
190 kg/cm²
1400 kg/cm²
230 kg/cm²

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RCC Structures Design
If C is creep coefficient, f is original pre-stress in concrete, m is modular ratio, E is Young's modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is:

(1 - C) mf - eE
(C - 1) mf + eE
(1 - C) mf + eE
(C - 1) mf - eE

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RCC Structures Design
If Sb, is the average bond stress on a bar of diameter ‘d’ subjected to maximum stress ‘t’, the length of the embedment ‘l’ is given by

l = dt/2Sb
l = dt/Sb
l = dt/4Sb
l = dt/3Sb

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RCC Structures Design
The load stress of a section can be reduced by

Replacing smaller bars by greater number of greater bars
Decreasing the lever arm
Replacing larger bars by greater number of small bars
Increasing the total perimeter of bars

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RCC Structures Design
The diameter of longitudinal bars of a column should never be less than

10 mm
8 mm
12 mm
6 mm

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RCC Structures Design
In a singly reinforced beam, if the permissible stress in concrete reaches earlier than that in steel, the beam section is called

Over reinforced section
Critical section
Economic section
Under-reinforced section

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