According to IS 456:2000, the maximum compressive strain in concrete under axial loading at the limit state of collapse is specified as ______.
-
A.
0.002
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B.
0.0015
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C.
0.0025
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D.
0.003
Correct Answer:
A. 0.002
Explanation:
The correct answer is 0.002.
According to the Indian Standard code IS 456:2000, which governs the design of reinforced concrete structures, specific strain limits are established for the limit state of collapse. For members subjected to pure axial compression, such as certain types of columns, the maximum compressive strain in concrete is designated as 0.002. This value represents the point where the parabolic portion of the concrete stress-strain curve reaches its maximum stress before entering the plastic range.
It is important to distinguish this from other loading conditions defined in the code: - For members in bending (flexure), the maximum strain at the outermost compression fiber is 0.0035.
- For members subjected to combined axial load and bending where no tension exists, the limit is calculated as 0.0035 minus 0.75 times the strain at the least compressed edge.The 0.002 limit for axial loading ensures a conservative safety margin against crushing across the entire cross-section of a compression member.
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