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Per §7.6.1, for practical design, concrete may reasonably be treated as a linear-elastic material up to about what fraction of its ultimate compressive stress?
A{'text': 'About 10 percent of ultimate', 'label': 'A'}
B{'text': 'About 90 percent of ultimate', 'label': 'B'}
C{'text': 'About 50 percent of ultimate', 'label': 'C'}
D{'text': 'Up to ultimate stress in all cases', 'label': 'D'}
Answer & Solution
Correct answer: C. {'text': 'About 50 percent of ultimate', 'label': 'C'}
1. §7.6.1 reads: 'the stress-strain relation of concrete also varies linearly with the sustained stress upto a value of 50 per cent of ultimate stress. Hence, for all practical purposes, the concrete could be considered as a linear elastic material when it loaded within 50 percent of the ultimate load.'
2. This is the assumption behind Working Stress Method of design.
_Source: IGNOU ET-522 Block-2 Unit-7 Strength of Concrete, §7.6.1, p. 56_
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