How does ideCAD control the weak story irregularity, according to ASCE 7-16, for two earthquake directions?
Weak Story Irregularities are checked in the Irregularity Report, and necessary conditions are applied.
Stri = Lateral strength defined at the i'th story
Discontinuity in lateral strength–weak story irregularity, is calculated as follows,
The Strength Irregularity Coefficient = ( Str )i / ( Str )i+1 < 0.80
Discontinuity in lateral strength–extreme weak story irregularity, is calculated as follows,
The Extreme Strength Irregularity Coefficient = ( Str )i / ( Str )i+1 < 0.65
According to article 220.127.116.11, structures assigned to Seismic Design Category E or F with horizontal irregularity Type 1b of Table 12.3-1 or vertical irregularities Type 1b, 5a, or 5b of Table 12.3-2 shall not be permitted.
According to article 18.104.22.168, structures with a vertical irregularity Type 5b, as defined in Table 12.3-2, shall not be more than two stories or 30 ft (9 m) in structural height, hn.