(1) Foundation piers shall be constructed of concrete or of reinforced masonry or reinforced brickwork:

Provided that, wherever the eccentricity of the centre-line of its load with respect to the centre-line of a foundation pier exceeds one-sixteenth of the height of the pier or one-tenth of the least lateral dimension, the pier shall be reinforced, and shall be designed and constructed in accordance with the requirements of these by-laws for reinforced concrete or reinforced brickwork

(2) The height of a plain concrete foundation pier shall not exceed twelve times its least lateral dimension.

(3) When the height of such pier does not exceed six times its least lateral dimension, the compressive stress therein shall not exceed 0,2 times the design 28-day compressive strength of the concrete.

(4) When the height of the pier exceeds six times but does not exceed twelve times its least lateral dimension, the compressive stress in such pier shall not exceed-

(1,3 – L divided by 20 D ) x p pascals
where-
L= the height of the pier, in meters
D= its least lateral dimension, in meters, and
p= the permissible stress for (L divided by D) = 6, in pascals.

(5) Subject to the provisions of subsections (6) and (7), reinforced concrete foundation piers shall be designed in accordance with the requirements for reinforced concrete columns, and such requirements shall be determined in accordance with the provisions of Chapter 3.

(6) If the soil provides lateral support, such piers may be designed without reduction of permissible stress on account of slenderness, where the ration of the effective height, determined as specified for concrete, to the least lateral dimension of the pier, does not exceed 18

(7) Where such ration exceeds 18, the permissible stress in the pier for such conditions of support from the soil shall be-

(1,5 – L’ divided by 36D ) *p’ pascals
where-
L’= the effective height of the pier, in meters
D= its least lateral dimension, in meters, and
p’= the permissible stress for L’/D=18 , in pascals

(8) Whenever the base of any foundation pier is made larger than its shaft, the base of the pier shall have a vertical thickness of not less than 150 millimeters as its edge. In such cases, the effective height of the pier shall be deduced from height measures from the top of the enlarged base to the underside of the member supported by the pier.