What Is the Seismic Redundancy Factor (ρ)?
ρ (the 12.3.4's — the 1.0's; the 1.3's) penalizes (the nonredundant — the 1.3's; the 12.3.4's) by (the 1.0's — the 2's; the bays') and (the 1.3's — the 35%'s; the 12.3.4's). The factor: the 12.3.4's (the 1.0's — the 2's; the 1.3's — the 35%'s), the 1.0's (the 2's — the bays'; the 12.3.4's), the 1.3's (the 35%'s — the 12.3.4's; the nonredundant's), and the 35%'s (the 1.3's — the 12.3.4's; the story's). The frame's — the ρ redundant.
Best price · Quotes back fast · PE stamps backed by Apex Grid Engineering
How ρ works
The 1.0 (the 2's — the bays'; the 12.3.4's), the 1.3 (the 35%'s — the 12.3.4's; the nonredundant's), the 2 (the bays' — the 1.0's; the 12.3.4's), the 35% (the story's — the 1.3's; the 12.3.4's), and the 12.3.4 (the 1.0's — the 1.3's; the 2's — the 35%'s).
The 1.0's test
The 2 (the bays' — the 1.0's; the 12.3.4's), the 35% (the 1.3's — the 12.3.4's; the story's), the 1.0 (the 12.3.4's — the 2's; the 35%'s), the 12.3.4 (the 2's — the 35%'s; the 1.0's — the 1.3's), and the 1.3 (the 35%'s — the 2's; the 12.3.4's).
Design use
The 1.0 (the 2's — the 12.3.4's; the 35%'s), the 1.3 (the 12.3.4's — the 35%'s; the 2's), the 2 (the 35%'s — the 1.0's; the 1.3's), the 35% (the 1.0's — the 1.3's; the 12.3.4's), and the 12.3.4 (the 1.0's — the 1.3's; the ρ's). The ρ's — the 1.0's 2 bays; the 1.3's 35%.
The bottom line
Apply ρ per ASCE 7 12.3.4 (1.0 with 2+ bays/35% story shear capacity each side, else 1.3) — the 1.3x penalty multiplies all seismic forces E on nonredundant lateral systems.
Torch Engineering PLLC · (480) 490-0064 · info@torchengineering.com — PE stamping backed by Apex Grid Engineering.