The Complete Message:
The curtain thickness cannot be less than 200 mm. (TBDY 2018 184.108.40.206)
In TBDY 2018 article 220.127.116.11 , 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 18.104.22.168 is fulfilled, you receive this message because the wall thickness is less than 200 mm.
Give the size of the shearwall with the name and floor at least 200 mm.
Choose shearwall, shearwalls.
Enter the properties.
In the general settings tab, increase the shearwall width and click the OK button.
ΣAg = The sum of the cross-sectional areas of the structural system elements working as a shearwall parallel to the earthquake direction considered at any story.
ΣAp = Sum of plan areas of all stories 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