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Design & Analysis of Stairs Using SAP2000

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  • WD =50 lb/ft2 , WL= 75 lb/ft2
  • Slab waist = 6”, f’c= 4ksi; fy = 60 ksi

Steps:

  • Unit = lb-ft
  • Model= stair cases
    • Stair type = type2,
    • Right level width= 6”,
    • Storey height = 13”,
    • Stair projected length = 11.25’
    • Opening b/w stairs = 1,
    • width1=5’,
    • width2 =6’
    • Max mash spacing = 1
  • Option>preference> concrete frame design ACI-2003
  • Define> material concrete, modify, f’c =4 ksi, fy=60ksi
  • Define > area section, modify, name= slab6. Thickness= 6”
  • Define > load cases, line load
  • Define > add default combo
  • Select waist slab
  • Select > invert selection
  • Assign > area > local axis, -90°
  • Select All
  • Assign > Area load > uniform assign loads
  • Analysis > analysis option, 3D
  • Analysis > run analysis; model “Do NOT RUN” Run Now
  • Display > show forces > area M11, M22

  • Display > show forces > area AST1, AST2

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