Design of Short Columns with Axial Compression

9 important questions on Design of Short Columns with Axial Compression

What is the practical % of vertical reinforcement in columns?

1-2%

What are the rules controlling column tie spacing?

No more that 1/2 spacing above a slab or footing or below the lowest reinforcement
- Tie spacing is the smallest of:
  1. 16*d longitudinal bar
  2. 48*d tie
  3. Smallest dimension of member
  4. 300 mm for a section containing bundled bars

What is the purpose of column ties?

Prevent buckling of vertical bars by shortening their effective length
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What is the maximum clear distance between untied vertical bars

150 mm

Why do spirally reinforced columns have a higher resistance?

Close tie spacing

Why do thin walls and columns have a reduced resistance?

Lack of toughness, limited room for reinforcement

Why are extra column ties added at the base of offset bars?

To resist horizontal force

Why provide minimum concrete cover?

Prevent corrosion and for fire resistance

Minimum cover of concrete cast against and permanently exposed to earth?

75 mm - think footings

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