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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.

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  1. L aB B V aL Fig 9-1

  2. Extreme Torsional Irregularity B D Torsional Irregularity A C Not TorsionallyIrregular Fig 9-2

  3. A B Fig 9-3

  4. 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

  5. Lines are 0.15 building dimensions from edge A B 10 Equal Spaces C D 10 Equal Spaces Fig 9-5

  6. Window Wall 16% of Enclosed Area 10 Equal Spaces 10 Equal Spaces Fig 9-6a

  7. 16% of Enclosed Area 10 Equal Spaces 10 Equal Spaces Fig 9-6b

  8. 10 Equal Spaces 48% of Enclosed Area 10 Equal Spaces Fig 9-6c

  9. 10 Equal Spaces 56% of Enclosed Area 10 Equal Spaces Fig 9-6d

  10. Possible Reentrant Corner 10 Equal Spaces 10 Equal Spaces Fig 9-7

  11. Line of Lateral Load–Resisting Elements Line of Lateral Load–Resisting Elements Total Shear Force V D Fig 9-8

  12. 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

  13. Fig 9-10

  14. Y X C.M. Fig 9-11

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