Soft Story Irregularity, ASCE 7-16

How does ideCAD control the soft story irregularities, according to ASCE 7-16, for two earthquake directions?

• Vertical 1a and 1b irregularity checks are made automatically, and detailed results are given in the Earthquake Regulation report.

• Soft Story Irregularities are checked in the Irregularity Report, and necessary conditions are applied.

SYMBOLS
K_i = Story Stiffness
V_i = The story shear at level i
δ_i = The deflection at the center of mass of level i

Soft Story Irregularity is defined by dividing stiffness in any i'th story by the stiffness of the upper story for any of the two earthquake directions perpendicular to each other, excluding basements where the coefficient is smaller than 0.7.

Extreme Soft Story Irregularity is defined by dividing stiffness in any i'th story by the stiffness of the upper story for any of the two earthquake directions perpendicular to each other, excluding basements where the coefficient is smaller than 0.6.

Next Topic

Weight (Mass) Irregularity per ASCE 7-16

Related Topics

• Stiffness–Soft Story Irregularity and Extreme Soft Story 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

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