The document outlines the preliminary design calculations for a column (c1) with dimensions of 300 x 450 mm, including the various loads applied to it such as dead and live loads. It details specific calculations for the dead loads from the slab, beam self-weight, and total loads, ultimately leading to a factored load of 1171.7 kN. Additionally, the document mentions the reinforcement percentage and provides dimensions for the remaining columns (c2 and c3).

1. PRELIMINARY DESIGN OF COLUMN (C1)
Assume size of column = 300 x 450 mm
Unit weight of concrete = 25 KN/m3
Unit Weight of Masonry = 20 KN/m3
Effective area of slab coming on Column = 4.85 x 3.5 =16.97 m2
DEAD LOADS
Weight of slab = 0.12 x 25 = 3.0 KN/m2
Floor Finishes on slab = 1.0 x 1.0 = 1.0 KN/m2
Total Dead Load on slab = 3.0+1.0 = 4.0 KN/m2
Dead load from Slab = 4.0 x 16.97 = 67.9 KN
Self weight of Beam per floor = [(1.5 x 0.3 x 0.23) + (2 x 0.3 x 0.45) + (1.8 x 0.3 x 0.3) +
( 3.05 x 0.3 x 0.45)] x 25
= 24.46KN
Total Dead load = 67.9+ 24.46 = 92.36KN
Dead load for remaining floors = 92.36 x 6 = 554.16 KN
Self Weight of column = [(3.5 x 6 x 0.3 x 0.45) + (1 x 1 x 0.3 x 0.45) ] x 25
= 74.25 KN
LIVE LOADS:
Live Load from Roof = 1 x 16.975 = 16.975 KN
Live load on floor = 2 x 16.975 =33.95 KN
Total live load on bottom most column
= [(4 x 33.95) + (1 x 16.975)] = 152.775 KN
Total load = 554.16 + 74.25 + 152.775 = 781.185 KN
Factored Load = 1.5 x 781.185 = 1171.7KN
Assuming percentage of reinforcement in columns as 2.5% of Gross cross sectional area
Pu = ( 0.4 x fck x Ac) x (0.67 x fy x Asc)
= [ 0.4 x 20 x ( Ag– 0.025 x Ag)] + [ 0.67 x 415 x 0.021 x Ag]
1171.7 x 103 = (7.8 x Ag) + (5.83905x Ag)
Ag = 85964 mm2< 135000 mm2
.’ . Provide size of the column as 300 x 450 mm2

2. DIMENSIONS OF THE REMAINING COLUMNS
COLUMN NOTATION PRELIMINARY COLUMN
DIMENSIONS (mm x mm)
C2 300 x 450
C3 230 x 230