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How to calculate the rings in reinforcement calculation!
Rings are generally made of 1 grade steel, with fy=2 10n/mm2.
The stress is considered as the dead weight g multiplied by 1.5. Force on each lifting ring F=G* 1.5/ number of lifting rings. Generally, when four rings are used, three calculations are taken.
So the required diameter can be calculated according to the following formula: D=SQTR(F/3. 14).
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