As per our last article How to Structural Design a Building/House Step by Step Part-1, 2 & 3. In this article, we design slab load, slab depth, slab steel design, Slab beam design. Now in this article, we calculated a column design.
Important Point
Column Design
Below Steps Column Design.
1. Column Size.
2. Column Min Steel Design.
3. Column Ring Size.
Column Size
Pu = (0.4 x fck x Ac) + (0.67 x fy x Asc)
Pu = Axial Load Kn
Ag = Gross Area of Column
fck = Strength Concrete
Ac = Ag – Asc
Asc =Â Area Steel Concrete
Minum Size of column 230 mmÂ
Column Min Steel Design
Assume 2% Steel Provided.
Asc = 0.02 Ag
Asc = 0.02 Gross Area of Column | Sp-16 ,P-229
Column Ring Size
Dia of Internal Ties | IS 456-2000, P-49
1. (1/4) x dia of a larger bar
2. 6 mm
Provide a larger to two values.
Pitch of Internal Ties | IS 456-2000, P-49
1. Least Internal Dimension
2. 16 x Dia. of Smaller Bar
3. 300 mm
Provide a smaller of three values.
Column Size Example
Load CalculationÂ
1. SlabWeight of Slab = (62.94 /2) + (180.97/2) = 121.95 kn.
2. Beam End Point weight Along lx = 13.54 kn
Weight of Beam Along Lx = (0.230 x 0.460 x 25) x 3.2 = 8.464 kn.mÂ
Along Lx Vu = (8.464 x 3.2) /2 = 13.54 kn
3. Beam End Point weight Along ly = 111.94 kn
Weight of Beam Along Ly = (0.230 x 0.460 x 25) x 9.2 = 24.334 kn.mÂ
Along Ly Vu = (24.334Â x 9.2) /2 = 111.94 kn
4. Total load Calculation = 247.435 kn
Column Size
Pu = (0.4 x fck x Ac) + (0.67 x fy x Asc)
Pu = 247.435 kn
fck = 20 N/mm2
fy = 415 N/mm2
Ac = 0.98 Ag
Pu = (0.4 x 20 x 0.98 Ag) + (0.67 x 415 x 0.02Ag )
247.435 x 103 = 13.401 Ag
Ag = √ 18496 mm2 = 136 mm ≅ 230 mm Min mumÂ
Column Min Steel Design
Asc = 0.02 Ag
Asc = 0.02 x 2302
Asc = 1058 mm2
Provide 4 Nos. 20 mm dia | SP 16, P. 229
Column Ring Size
Dia of Internal Ties| IS 456-2000, P 49
1. (1/4) x dia of a larger bar
= (1/4) x 20Â = 5mm
2. 6 mm
Provided larger 6 mm Ø lateral ties
But we, Provided 8 mm Ø lateral ties
Pitch of Internal Ties | IS 456-2000, P-49
1. Least Internal Dimension =
Least Internal Dimension = 230mm
2. 16 x Dia. of Smaller Bar
16 x 20 = 320 mm
3. 300 mm
Provide a smaller of three values.
Provide pitch = 230 mm c/c
Provided, 8 mm Ø lateral ties at 230 mm c/c
Column
How to Structural Design a Building/House Step by Step
How to Structural Design a Building/House Step by Step – 4 Download Excel Sheet
Also, read:Â How to Structural Design a Building/House Step by Step Part-1 (One Way Simply Support Slab)
Also, read:Â How to Structural Design a Building/House Step by Step Part-2 (Two Way Simply Support Slab)
Also, read:Â How to Structural Design a Building/House Step by Step Part-3 (Slab Beam Design)
Where is lintel beam design, plinth beam design, and footing design?
It would be better if we get lintel beam design, plinth beam design and footing design.
Thanking you.