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

• 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.