Recommendations regarding design of lacings:
The IS 800 : 1984 has provide the following recommendations regarding design of lacings :
(a) The lacings are designed to resist a total transverse shear, V, at any point in the length of the member, equal to at least 2.5% of the axial force in the member. This shear is considered as divided equally among all transverse lacing systems in parallel planes.
Thus, V = P/40
(b) If any additional shear is caused due to eccentricity of loading, applied end moments or lateral loading on the column, this has to be added to V in Eq. (6.4).
(c) The slenderness ratio of the lacing bars shall not exceed 145.