Concrete · Columns & walls

RC wall: simplified axial capacity calculator

Braced wall design axial strength per unit length with eccentricity and the slenderness eccentricity ea = Hwe²/(2500 tw).

Standard: AS 3600 Cl 11.5

Inputs in the worked example

The live calculator starts with these values; change any of them and every result, check and diagram updates instantly.

Input	Value	Unit
Wall thickness	200	mm
Floor-to-floor height	3.2	m
Effective height factor k	0.75 restrained top & bottom against rotation
Load eccentricity (≥ 0.05 tw)	15	mm
f′c	N32	MPa
Design load N*	900	kN/m

Diagram for the worked example

Hwe = k Hw = 0.75*3.2*1000 = 2400 mm
ea = Hwe²/(2500 tw) = 2400^2/(2500*200) = 11.52 mm
e used (≥ 0.05 tw) = MAX(15,0.05*200) = 15 mm
φNu = 0.65 (tw − 1.2e − 2ea) 0.6 f′c = 0.65*(200-1.2*15-2*11.52)*0.6*32 = 1983.8 kN/m
Slenderness Hwe/tw = 2400/200 = 12

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For preliminary design and education. Check every result against the current standard and your own engineering judgement before use.