What Is Shear Wall Design per ACI 318?
Shear walls (the 18's — the chapter's; the special) resist (the lateral — the 100%'s; the seismic) via (the boundary's — the elements'; the confined) and (the web's — the 2-curtain; the 0.0025's). The design: the 18.10's (the special's — the 2%'s; the drift's), the boundary's (the 0.005's — the confined; the 18.10.6's), the 0.0025's (the rho's — the minimum; the 2-curtain's), and the coupling's (the 2:1's — the diagonal's; the 18.10.7's). The wall's — the ACI 18 designed.
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The special wall's requirements
The 18.10 (the special's — the 2%'s; the drift's), the boundary (the 0.005's — the confined; the 18.10.6's), the 0.0025 (the rho's — the 2-curtain's; the 18.10.2's), the 2-curtain (the 10-inch's — the required; the 18.10.2's), the 2% (the drift's — the 0.02's; the 18.10's), and the 1.5 (the shear's — the amplified; the 18.10.3's).
Boundary elements
The 0.005 (the strain's — the 18.10.6's; the confined), the 12-inch (the width's — the 1/16's; the hu/16's), the hoops (the 6-inch's — the 4db's; the 18.10.6's), the 2% (the longitudinal's — the 6's; the bars'), and the 18.10.6 (the trigger's — the c's; the 0.005's).
Coupling beams
The 2:1 (the aspect's — the diagonal's; the 18.10.7's), the diagonal (the 2-curtain's — the 4's; the bars'), the 10√f'c (the shear's — the limit; the 18.10.7's), the 4:1 (the conventional's — the 4's; the 18.10.7's), and the 2% (the drift's — the 0.02's; the 18.10's). The wall's — the boundary's confined; the coupling's — the diagonal.
The bottom line
Design special shear walls per ACI 318 18.10 (2% drift, 2-curtain ρ 0.0025, boundary elements at ε 0.005 with 6-in hoops, 1.5x amplified shear) — use diagonal coupling beams for aspect <2:1 (shear ≤10√f'c).
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