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Reinforcement bar spacing determines concrete coverage and structural capacity. Adequate spacing ensures proper concrete consolidation and strength.
Водич корак по корак
- 1Minimum spacing typically 1.5× bar diameter or 40 mm, whichever is larger
- 2Account for aggregate size (spacing > 1.3× max aggregate diameter)
- 3Calculate based on cover requirements and member width
Worked Examples
Инпут
#25 rebars (25 mm), clear cover 50 mm, beam width 400 mm
Резултат
Maximum ~4 bars fit with 50 mm spacing
Detailed calculation
Common Mistakes to Avoid
- ✕Neglecting concrete cover in spacing calculations
- ✕Over-crowding reinforcement in small beams
Frequently Asked Questions
Why space rebar widely?
Concrete must flow around bars; tight spacing creates voids, reducing strength.
What if spacing is too tight?
Concrete won't fully consolidate; hidden voids reduce strength and durability.
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