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Question

Stress-strain curve of concrete is

A
A perfect straight line upto failure
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B
Straight line upto 0.002 strain value and then parabolic upto failure.
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C
Nearly parabolic upto 0.002 strain value and then a straight line upto failure
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D
Hyperbolic upto 0.002 strain value and then a straight line upto failure
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Solution

The correct option is C Nearly parabolic upto 0.002 strain value and then a straight line upto failure
The characteristic and design stress-strain curves specified by the Code for concrete in flexural compression are depicted in Figure below. The maximum stress in the concrete in the structure is restricted to 0.67 fck. The curves consist of a parabola in the initial region upto a strain of 0.002 (where the slope becomes zero), and a straight line thereafter, at a constant stress level up to an ultimate strain of 0.0035.


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