The steel economy programme was initiated by erstwhile Indian Standards Institution in the year 1950 with the
objective of achieving economy in the use of structural steel by establishing rational, efficient and optimum
standards for structural steel products and their use. IS 800: 1956 was the first in the series of Indian Standards
brought out under this programme. The standard was revised in 1962 and subsequently in 1984, incorporating
certain very importmt changes.
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2016-06-22 17:29:36
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好文，详细讲述了规范安全度发展的历史和变化，很有收获。