Discontinuity in Lateral Strength–Weak Story Irregularity per ASCE 7-16

SYMBOLS
S_tri = Lateral strength defined at the i'th story

5a. Discontinuity in Lateral Strength–Weak Story Irregularity

For any of two earthquake directions perpendicular to each other, discontinuity in lateral strength–weak story irregularity is defined as the story lateral strength is less than 80% of that in the story above. The story lateral strength is the total lateral strength of all seismic-resisting elements sharing the story shear for the direction under consideration.

5b. Discontinuity in Lateral Strength–Extreme Weak Story Irregularity

For any of two earthquake directions perpendicular to each other, discontinuity in lateral strength–extreme weak story irregularity is defined as the story lateral strength is less than 65% of that in the story above. The story strength is the total strength of all seismic-resisting elements sharing the story shear for the direction under consideration.

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Weak Story Irregularity per ASCE 7-16

Related Topics

• Stiffness–Soft Story Irregularity and Extreme Soft Story Irregularity per ASCE 7-16

• Weight (Mass) Irregularity per ASCE 7-16

• Vertical Geometric Irregularity per ASCE 7-16

• In-Plane Discontinuity in Vertical Lateral Force-Resisting Element Irregularity per ASCE 7-16