Except for basement perimeter shearwalls, H w / l w ≤ 2.0 control is made for shearwalls without holes. The internal forces of the walls in this condition calculated according to the R coefficients given in Table 4.1 are automatically calculated and enlarged by multiplying the coefficient [3 / (1+ H w / l w )].
ICONS
D = Strength Redundancy
H w = Curtain height
l w = Length of the curtain in plan
R = Structural System Behavior Coefficient
Walls with H w / l w ≤ 2.0 and outside the basement perimeter walls have the shear force on the walls, while the earthquake results calculated according to the R coefficient are specified with the Resistance Excess Coefficient D and in 4.3.4.9 (3 / (1+ H w / l w ) ] is enlarged by multiplying by the coefficient. As the design shear force, the shear force under the combined effect of the earthquake loads calculated by considering the Resistance Excess Coefficient D and the coefficient [3 / (1+ H w / l w )] together with the vertical loads is used.
Article TBDY 4.3.4.9 'to internal forces limits TBDY Article 7.6.6.3 recited in screen design shear forces are taken into account in the calculation.