The specific load capacities of different aluminum I-bar grating sizes vary based on the bearing bar size, spacing, and span. Here are some detailed load capacities for various configurations of aluminum I-bar gratings based on the provided data:

• 3/4″ I-Bar:

  • Approx. Weight: 1.7 – 3.8 psf
  • Maximum Pedestrian Span: 2′-11″ to 3′-9″
  • Load Capacities (Uniform Load, Concentrated Load, Deflection):
    • At 2′-0″ span: U = 355 lbs/sq.ft, C = 284 lbs/ft, D = .154 inches
    • At 3′-0″ span: U = 158 lbs/sq.ft, C = 237 lbs/ft, D = .346 inches
    • At 4′-0″ span: U = 116 lbs/sq.ft, C = 203 lbs/ft, D = .470 inches2.

• 1″ I-Bar:

  • Approx. Weight: 1.7 – 4.3 psf
  • Maximum Pedestrian Span: 3′-3″ to 4′-6″
  • Load Capacities (Uniform Load, Concentrated Load, Deflection):
    • At 2′-0″ span: U = 421 lbs/sq.ft, C = 337 lbs/ft, D = .144 inches
    • At 3′-0″ span: U = 187 lbs/sq.ft, C = 281 lbs/ft, D = .259 inches
    • At 4′-0″ span: U = 138 lbs/sq.ft, C = 241 lbs/ft, D = .353 inches2.

• 1-1/4″ I-Bar:

  • Approx. Weight: 2.4 – 5.2 psf
  • Maximum Pedestrian Span: 3′-11″ to 5′-4″
  • Load Capacities (Uniform Load, Concentrated Load, Deflection):
    • At 2′-0″ span: U = 658 lbs/sq.ft, C = 526 lbs/ft, D = .092 inches
    • At 3′-0″ span: U = 292 lbs/sq.ft, C = 439 lbs/ft, D = .207 inches
    • At 4′-0″ span: U = 215 lbs/sq.ft, C = 376 lbs/ft, D = .282 inches2.

• 1-1/2″ I-Bar:

  • Approx. Weight: 2.7 – 6.8 psf
  • Maximum Pedestrian Span: Up to approximately 6′-4″
  • Load Capacities (Uniform Load, Concentrated Load, Deflection):
    • At a span of up to approximately:
      • U = up to approximately ~1421 lbs/sq.ft
      • C = up to approximately ~1137 lbs/ft
      • D = up to approximately ~1.229 inches2.

These values are theoretical and based on the gross sections of the bearing bars using a fiber stress of around ~12,000 psi. The actual load capacity may vary due to slight variations in mill and manufacturing tolerances.

For more detailed information on specific configurations and additional sizes not covered here, consulting the manufacturer’s load tables or contacting their technical support is recommended.