We need some help in finding background information (derivation/journal reference) of the equation in table-1 (Subsection - (iii) Slender wall 1st equation) of IS 13920-2016. For equation please refer to the attachment.
From this equation we were trying to find minimum horizontal steel for a wall of height 200m and length of 6m with percentage of longitudinal steel in web as 0.8%.
With the inputs above the minimum percentage of horizontal steel comes out to be 8.87% (Which is too high – T32@15mm c/c).
Please refer to the snip in attachment for minimum horizontal steel for different percentage of longitudinal steel in web.
If anyone can share journal reference for this equation is greatly appreciated.