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Architectural Drawing. Structural Calculations. Beams and Girders. Beams or girders support floor joists over long spans. Beams or girders May be wood or metal. Wood beams may be built-up or solid. Steel beams may be S-beams or W-beams. Size based on weight of the structure and the span.

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Architectural Drawing


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architectural drawing

Architectural Drawing

Structural Calculations

beams and girders
Beams and Girders

Beams or girders support floor joists over long spans.

Beams or girders May be wood or metal.

Wood beams may be built-up or solid.

Steel beams may be S-beams or W-beams.

Size based on weight of the structure and the span.

structure loads
Structure Loads

Dead load is the weight of the structure itself:

Roofing, siding, joist, etc.

Live load is the fixed or moving weights:

Furniture, appliances, occupants, snow on the roof, etc.

weight supported by beam
Weight Supported by Beam

Typical Load Distribution in a Structure

structural calculations6
Structural Calculations

Typical Load Distribution in a Structure

structural calculations8
Structural Calculations

Beam Support Area with no columns

structural calculations9
Structural Calculations

Beam Support Area with one column

structural calculations10
Structural Calculations

Beam Support Area with two columns

structural calculations12
Structural Calculations

W-beam span and load table.

(American Institute of Steel Construction)

structural calculations13
Structural Calculations

Column Support Area with one column

structural calculations14
Structural Calculations

Column Support Area with two columns

structural calculations16
Structural Calculations

Beam Support Area

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Structural Calculations

Column Support Area

structural calculations19
Structural Calculations
  • Procedure for Using Span Data Charts
  • Select species of wood to be used.
  • Select appropriate live load.
  • Determine lumber grade to be used.
  • Scan the lumber grade row and note the maximum spans.
  • Select the joist size and spacing that will support the desired live load (16" OC spacing is typical).