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A403.5 Weak Story Limitation

Existing Building Code 2009 of Pennsylvania > A4 Earthquake Hazard Reduction in Existing Woodframe Residential Buildings With Soft, Weak or Openfront Walls > A403 Analysis and Design > A403.5 Weak Story Limitation

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Every weak story shall be strengthened to the lesser of:

Ω_o times the story shear prescribed by Sections A403.3 and A403.4.
In two-story buildings up to 30 feet (9144 mm) in height, 65 percent of the strength of the story above. In all other buildings, 80 percent of the strength of the story above.

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