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– Changes in limit state design, materials (cement grades, steel Fe 500/550), durability, crack control, and seismic provisions make the 1978 version dangerously obsolete.

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. While largely superseded by the 2000 edition, it remains a critical point of reference for historical structural assessments and academic study Key Features of IS 456:1978 The Paradigm Shift (LSM) – Changes in limit state design, materials (cement