Resistance Moment Calculations (Walls BS 8110) PDF
Resistance Moment Calculations (Walls BS 8110) PDF
Resistance Moment Calculations (Walls BS 8110) PDF
Where
= N*emin,x
= N*emin,y
A
BS 81101:1997 3.8.2.4
Short columns
The design ultimate moment of braced short or unbraced short column at top, bottom and midfifth
span of column is obtained as below:
Slender columns
Additional Moments for Slender Columns:
For braced slender column it is necessary to consider additional moments induced by the lateral
deflection of the loaded column.
Madd = N*αuA
Where
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Resistance Moment Calculations (Columns: BS 8110) Page 2 of 3
Where
B
βa = (1/2000)*(le/b’)2
K = reduction factor that corrects the deflection to allow for the influence of axial
load
Where
Nuz = design ultimate capacity of a section when subjected to axial load only
= 0.45*fcu*Ac + 0.87*fy*Asc
Note: Value of Nbal for all section shapes can be correctly obtained by interaction curve. Values stated
above for rectangular and circular section can be used for checking guidance only.
Where
A
BS 81101:1997 equation 35
B
BS 81101:1997 equation 34
C
BS 81101:1997 equation 33
D
BS 81101:1997 3.8.1.1
E
Reynolds's Reinforced Concrete Designer's Handbook 11th Edition, Section 3.22
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Resistance Moment Calculations (Columns: BS 8110) Page 3 of 3
Parent topic
• Column Design to BS 8110
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