The 'development length' for a bar in compression (IS 456) compared to tension is:
Choose the correct answer
Same as tension Ld (no difference)
80% of tension Ld — compression has no splitting tendency and end bearing helps, so shorter development needed
120% of tension Ld
50% of tension Ld
Correct Answer
B. 80% of tension Ld — compression has no splitting tendency and end bearing helps, so shorter development needed
Why is this the answer?
IS 456 Cl. 26.2.1: development length Ld = φ×σs/(4×τbd). In compression: (1) No splitting tendency (bars being pushed in, not pulled); (2) End bearing contributes. IS 456 allows Ld in compression = 80% of Ld in tension. Tension Ld = φ×σs/(4×τbd); Compression Ld = 0.8 × tension Ld. Note: τbd for compression same formula but the 25% reduction factor gives 80% of tension value. Important for column bars passing through slabs.
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