The 'development length' for a bar in compression (as per IS 456) is:
Choose the correct answer
Equal to tension development length always
80% of tension Ld (compression bond stress is 25% higher than tension, per IS 456)
Twice the tension development length
Zero (no anchorage needed in compression)
Correct Answer
B. 80% of tension Ld (compression bond stress is 25% higher than tension, per IS 456)
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Development length in compression (IS 456 Cl. 26.2.2): Ld = φ·σs/(4τbd). For compression: bond stress τbd is increased by 25% compared to tension (IS 456 Table 26). So Ld (compression) = Ld (tension) / 1.25 = 0.8 × Ld (tension). Compression bars have shorter embedment requirement because end bearing also transfers some load.
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