(1) Material specification.- Cast iron used for structural members in buildings shall be of grade not less than Grade 10 of B.S. 1452.

(2) Permissible stresses.- The permissible stresses in cast-iron structural members shall not exceed the values given below in megapascals-

Tension in bending 21

Axial tension 21

Shear 14

Axial compression (bearing) 83

Compression in bending 42

Compression in columns 83-28 l/r where l/r, the slenderness ration, is the ration of the actual length of the member to the least radius of gyration of its cross section.

 (3) If a cast-iron column is not symmetrical about both longitudinal axes, and is not supported laterally between its ends, its slenderness ration shall be determined by the methods detailed in appropriate standard in Chapter 3.

 (4) Columns and compression-members.- No cast-iron column or other cast-iron compression-member shall have a length, l, exceeding 100 times its least radius of gyration, r.

 (5) The ends of all cast-iron columns shall be fixed in position and direction.