(1)Where the slenderness ratio does not exceed 15, the stresses due to axial vertical loads in-

a) cat-in-situ plain concrete walls computed as evenly distributed over-

i) the cross-sectional area of the wall; or

ii) if there are openings in the wall, over the reduced cross sectional area between openings; and

b) plain concrete columns;

shall not exceed those set out in Table XXII for the appropriate type of concrete.

TABLE XXII STRESSES PERMITTED IN CONCRETE WALLS AND COLUMNS

(2) Where the slenderness ration of any wall referred to in subsection (1) exceeds 15, but does not exceed the values set out in Table XIX, the stress in such wall shall not exceed the figure obtained by multiplying the stress specified in subsection (1) by the appropriate factor set out in Table XXIII

TABLE XXIII
STRESS FACTORS FOR SLENDER CONCRETE WALLS