Lifting Lug Calculations

The Eurocode provides methods for assessing lug strength, while ESDU (Engineering Sciences Data Unit) offers an alternative approach. Here’s a brief comparison:

1. Eurocode Method:

   • Ultimate Resistance of Net Cross-Section: This considers the maximum load a lug can withstand before failure.
   • Deductions for Fastener Hole: Adjustments are made to account for holes where fasteners (bolts or rivets) pass through the lug.
   • Design Resistance of Individual Fasteners: Evaluates the strength of each fastener.
   • Lifting Lug Allowables and Margin of Safety: Determines safe working loads and incorporates a safety margin.

2. ESDU Method:

   • Axial Rupture: Calculates the minimum load causing rupture (failure) of the lug under axial loading.
   • Axial Shear Bearing: Assesses shear-bearing failure under axial loads.
   • Axial Permanent Deformation: Determines the maximum permissible permanent deformation.
   • Transversal Rupture: Considers rupture due to transverse loads.
   • Transversal Permanent Deformation: Evaluates permanent deformation under transverse loads.
   • Bearing Permanent Deformation: Addresses permanent deformation due to bearing loads.

   Additionally, ESDU accounts for effects like pin bending in double shear joints.