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L. a B. B. V. a L. Fig 9-1. Extreme Torsional Irregularity. B. D. Torsional Irregularity. A. C. Not Torsionally Irregular. Fig 9-2. A. B. Fig 9-3. 1. 2. 3. 4. 5. 6. 7. Moment frame , all bays. A. 30 ft-0. B.F. B.F. B.F. B.F. B. V. 20 ft-0. 80 ft-0. 6.2 ft.
E N D
L aB B V aL Fig 9-1
Extreme Torsional Irregularity B D Torsional Irregularity A C Not TorsionallyIrregular Fig 9-2
A B Fig 9-3
1 2 3 4 5 6 7 Moment frame, all bays A 30 ft-0 B.F. B.F. B.F. B.F. B V 20 ft-0 80 ft-0 6.2 ft C Moment frame, all bays 30 ft-0 D 6@ 20 ft-0in.=120 ft-0in. Center of Mass Center of Rigidity 124 ft-0in. Fig 9-4
Lines are 0.15 building dimensions from edge A B 10 Equal Spaces C D 10 Equal Spaces Fig 9-5
Window Wall 16% of Enclosed Area 10 Equal Spaces 10 Equal Spaces Fig 9-6a
16% of Enclosed Area 10 Equal Spaces 10 Equal Spaces Fig 9-6b
10 Equal Spaces 48% of Enclosed Area 10 Equal Spaces Fig 9-6c
10 Equal Spaces 56% of Enclosed Area 10 Equal Spaces Fig 9-6d
Possible Reentrant Corner 10 Equal Spaces 10 Equal Spaces Fig 9-7
Line of Lateral Load–Resisting Elements Line of Lateral Load–Resisting Elements Total Shear Force V D Fig 9-8
A B C C C A) 2nd story and above shear wall B) 1st story–only shear wall C) Full height shear wall Fig 9-9
Y X C.M. Fig 9-11