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ASThe thumb rule for calculating the depth of a beam based on its span depends on the type of beam and the loading conditions.
1. For Simply Supported Beams
Depth (D) = Span / 15 to Span / 20
Example: If the span is 6 meters,
Depth = 6000 mm / 15 to 6000 mm / 20
Depth = 400 mm to 300 mm
2. For Cantilever Beams
Depth (D) = Span / 8 to Span / 10
Example: If the span is 4 meters,
Depth = 4000 mm / 8 to 4000 mm / 10
Depth = 500 mm to 400 mm
3. For Continuous Beams
Depth (D) = Span / 20 to Span / 25
Example: If the span is 8 meters,
Depth = 8000 mm / 20 to 8000 mm / 25
Depth = 400 mm to 320 mm
Other Considerations:
The width (B) of the beam is usually 1/2 to 2/3 of the depth (D).
The final design should always be verified with structural analysis and local building codes.
The load on the beam (dead load, live load) affects the required depth.
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