National standard for thickness of metal materials for metal bridge

According to cecs31-2006 code for design of steel cable tray engineering:
Up to 150: thickness: 1.0
Over 150 up to 300: thickness: 1.2
Over 300 up to 500: thickness: 1.5
Over 500 up to 800: thickness: 2.0
Over 800 thickness: 2.2

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