IRC Class AA loading for bridge design represents:
Choose the correct answer
Standard passenger car loading
Heavy tracked/wheeled military vehicle (70 t tracked or 40 t wheeled) — most severe IRC loading
Crowd loading on footpath only
Seismic loading case
Correct Answer
B. Heavy tracked/wheeled military vehicle (70 t tracked or 40 t wheeled) — most severe IRC loading
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IRC Class AA (IRC:6): represents heavy military vehicle or tracked vehicle loadings — either (a) Tracked vehicle (70 tonne) or (b) Wheeled vehicle (40 tonne bogie). Most severe IRC loading for major bridges. After Class AA: Class A (standard highway traffic, 8 axle, ~55 tonne), Class B (temporary bridges). Medium and small bridges: designed for whichever governs between AA and A.
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