The Complete Message:
The curtain thickness cannot be less than 200 mm. (TBDY 2018 7.6.1.3)
In TBDY 2018 article 7.6.1.3 , if both the conditions given in Eq .
Σ A g / Σ A p ≥ 0.002 and V t / Σ A g ≤ 0.5 f ctd (7.14)
Even if the special condition given in 7.6.1.3 is fulfilled, you receive this message because the wall thickness is less than 200 mm.
Solution:
Give the size of the curtain with the name and floor at least 200 mm.
Choose curtains, curtains
Enter the properties.
In the general settings tab, increase the curtain width and click the OK button.
Icons
ΣAg = The sum of the cross-sectional areas of the structural system elements working as a curtain parallel to the earthquake direction considered at any floor.
ΣAp = Sum of plan areas of all floors of the building
Vt = Total earthquake load (base shear force) acting on the building according to TBDY 2018 Section 4
fctd = Design tensile strength of concrete