Bridge Girder Sizing
Determine optimal girder sections for strength and deflection compliance.
Design Result
RECOMMENDED SECTION
Selected Profile
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Max Moment:
0 kNm
Bending Stress:
0 MPa
Allowable: 0 MPa
Calculated Deflection:
0 mm
Allowable Limit:
0 mm
Auto-selection from Standard IPE/HEB
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Understanding Bridge Girder Sizing
The bridge girder is the main structural component of an EOT crane. This calculator helps you select the optimal I-beam (IPE or HEB) section that can support the crane's load while maintaining structural integrity and minimizing deflection.
Inputs Explained
- Safe Working Load (SWL): The maximum weight the crane is designed to lift.
- Crane Span: The center-to-center distance between the runway rails.
- Bridge Weight: The estimated weight of the girder itself (used for initial moment calculation, then refined).
- Trolley Weight: The weight of the hoist and trolley mechanism that moves along the girder.
- Duty Class & Impact Factor: Higher duty cycles (M4-M8) require an impact factor to account for dynamic loads during lifting and travel.
- Deflection Limit: The maximum allowable vertical bending of the girder. Standard is Span/750. Precision applications may require Span/1000.
Outputs Explained
- Selected Profile: The lightest standard beam (IPE or HEB) that meets both stress and deflection requirements.
- Bending Stress: The calculated stress in the beam under full load. Must be less than the Allowable Stress (Yield Strength / Safety Factor).
- Calculated Deflection: The vertical displacement of the beam at the center span. Must be less than the Deflection Limit.