Roofing with reinforced concrete
Additional reinforcement in terms of steel is added at that part of the beam, structurally where the sagging takes place. In the sense that normally across a beam or a slab, you have the reinforcements at the bottom. When we talk long spans, the slab might get weak and would result in small cracks. To avoid this the steel reinforcement of the slab doesn’t only spread across the bottom but also the top by bending the steel bars. This produces a resistant moment against the sagging point of the slab.
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