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Analysis of 3D Frame (Multi-Storey) using SAP2000

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  • Slab = 6”, f’c =4 ksi, fy= 60ksi,
  • WD = 30 lb/ft (for 1st floor)
    • Wd = 58.3 lb/ft for top & 2nd floor
    • WL= 30 lb/ft for top floor,
  • WL = 100 lb/ft, 1st , 2nd & ground floor
  • B 15 x 10, B18 x 12, B21 x 12,
  • C10*10, C12*12, C18*18, C24* 12.

Steps:

  • Unit K-ft
  • New model = 3D frame beam slab building,
    • Storey = 4,
    • X-bays=4,
    • Y-bays=3,
    • Xwidth= 25’
    • Y-width= 20’,
    • Height= 15
  • Edit:
    • X= 0,25,35,55,80
    • Z= 0,15,28.5,42,55.5
  • Option > Preference
    • Concrete frame ACI-2001
  • Define > material,
    • concrete,
    • f’c= 4ksi ;
    • fy= fys= 60ksi.
  • Define > frame selection,
    • Define all beams & columns.
  • Define> load cases, add line load.
  • Define> add default combos check concrete, convert to user.
  • Select beams.
  • Assign>frame
    • frame selection,
    • select B15*10.
  • Select > get Previous selection.
  • Assign>frame>insertion point.
  • Select column.
  • Assign>frame>frame selection c10*10.
  • Define>area section> modify slab 6, H= 6”.
  • Select area.
  • Assign> area load apply loads.
  • Analyze> set analysis option, 3D frame.
  • Analyze>Run analysis model
    • “DO NOT RUN”,
    • RUN NOW.
  • Run K-ft. Move mouse over slab & find max deflections, it should not exceeds 1”
  • Display> show forces/stress>
    • Area,
    • UDCON2.
    • Design steel,
    • Top, Ast1, then Ast1, then.
    • Bottom Ast1, Ast2 and find max value.
  • Design > show forces/stress
    • select design column, s
    • elect UDCON1& UDCON2.
  • 3Design > show forces/stress
    • Start ok design/check.
  • Design > show forces/stress
    • Verify all members passed.
  • All members should pass.
  • Design > show forces/stress
    • Display design information, longitudinal reinforcement.
  • For beams & columns, select max value and find number of bass.
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