How to determine the cutting length of chair bar in slab & footings

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The chairs in reinforcement are provided for the following reasons. 1. It retains the gap among the two bars as well as upper and lower cage reinforcement. 2. It provides strong supports to the bars. 3. It improves the strength of the structure and retains the tension in RCC. 4. It raises the tension property of concrete. 5. It reduces the scope for collapsing of the building because of the failure of compression and tension zone.