RCC · column
Column
1
Section and design mode
floor 300 × 300
Design mode
Section
b and D both searched, D ≥ bb along the frame’s X, D along Y
2
Storey and restraint
cl 25.1.3 · cl 25.2, Table 28
End condition about x
End condition about y
l_ex = 1853 mm · l_ex/D = 6.17 (short)l_ey = 1853 mm · l_ey/b = 6.17 (short)
3
Design actions
factored · M_ux bends the column in D, M_uy in b
e_min = 20.0 / 20.0 mmM_dx = 35.0 · M_dy = 20.0 kN·mP_u/P_uz = 0.582
4
Materials and durability
Concrete grade, fck
Steel grade, fy
Exposure condition
Bar sizes
main
tie
Nominal cover 40 mm — cl 26.4.2.1's column floor · d′ = cover + Øtie + Ø/2 = 58 mm
5
Steel window
the search tries the least steel first
The trial starts at the least steel not below the first figure and the section grows only where nothing up to the second clears every check — steel before section. cl 26.5.3.1’s 0.8 % floor and its 4 % and 6 % ceilings are checked whatever the window says.
6
Ductile detailing
IS 13920:2016 cl 7 · cl 9
Seismic frame
cl 7.1.1 floors the column at 20 db and 300 mm; cl 7.6.1 confines each end over lo; cl 7.2.1 and cl 7.5.1 need the beams’ moments of resistance at the joint, which a form holding one column cannot know — state them to have both worked.