1) Why does the ACI code specify a maximum spacing for the reinforcing bars in one-way slabs?
2) Why does the ACI code requires a minimum horizontal distance between reinforcing bars in rectangular reinforced concrete beams?
1) Maximum spacing between reinforcing bars in one - way slab is required to ensure minimum desired strength against the loads to avoid structural cracks in the slab.
Also Maximum spacing ensures to provide adequate support for Bending Moment and Shear Force in design.
2) Minimum horizontal distance between reinforcing bars in beams is required so that maximum sized aggregates can be properly placed between the bars thus concrete gets easily placed and compacted between two bars. Hence proper bond between concrete and reinforcing bars can be gained. Maintaining minimum distance between reinforcing bars also avoids honeycombing.
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