The 'crane girder' (overhead travelling crane beam) is designed for:
Choose the correct answer
Only dead load of the crane itself
Fatigue (repeated cycles), biaxial bending (vertical + lateral surge), local web bearing, and impact factor (25%)
Only horizontal wind loads on the building
Static wheel load with no impact or fatigue
Correct Answer
B. Fatigue (repeated cycles), biaxial bending (vertical + lateral surge), local web bearing, and impact factor (25%)
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Crane girder: supports overhead crane wheels. Special considerations: (1) Fatigue loading (repeated wheel passes — IS 807 classifies cranes M1 to M8, IS 800 Cl. 13); (2) Biaxial bending (vertical wheel load → vertical bending; lateral surge force from crane → lateral bending on top flange); (3) Local web crippling under concentrated wheel load; (4) Impact factor: typically 25% added to static wheel load. Worst combination: maximum vertical + lateral surge. Dynamic analysis needed for heavy cranes.
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