Design Moment for Polygonal Cross-Section Shearwalls

ICONS

H _w = Total curtain height measured from the top of the foundation or the ground floor slab
H _cr = Critical curtain height
l _w = Length of the curtain or tie-beam curtain piece in plan

7.6.6. Design Bending Moments and Shear Forces

7.6.6.1 - For walls meeting the H _w / l _w > 2.0 condition, bending moments based on the design shall be taken as a constant value along the critical wall height determined in accordance with 7.6.2.2 , equal to the bending moment calculated at the wall base according to Section 4 . Above the section where the critical wall height ends , a linear moment diagram parallel to the line joining the moments calculated at the base and top of the wall according to Section 4 will be applied (Figure 7.12) . In buildings with basements that meet the conditions given in 3.3.1.1 , the constant curtain moment will be taken into account along the critical wall height defined in 7.6.2.2 .
Design bending moments in all sections of walls with H _w / l _w ≤ 2.0 shall be taken equal to bending moments calculated according to Section 4 .

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7.6.6.2 - In the case of H _w / l _w > 2.0, the moments of bearing capacity of the wall sections at each floor must meet the condition given by Equation (7.3) for the columns in the strong direction of the wall . Otherwise, the earthquake calculation will be repeated by increasing the curtain dimensions and / or reinforcements.