The 'IRC:6' live loads for bridge design in India include:
Choose the correct answer
Only pedestrian loads
IRC Class AA (70t tracked), A, B, and 70R loading configurations for different bridge categories
Only wind loading
Uniform 10 kN/m² for all bridges
Correct Answer
B. IRC Class AA (70t tracked), A, B, and 70R loading configurations for different bridge categories
Why is this the answer?
IRC:6 (Standard Specifications and Code of Practice for Road Bridges, Section II — Loads and Load Combinations): (1) IRC Class AA — 70 t tracked / 40 t wheeled vehicle (for major bridges); (2) IRC Class A — 55 t vehicle train (standard loading); (3) IRC Class B — lighter (rural bridges); (4) Class 70R — newer heavier standard. Also includes: footpath loads, wind, seismic, temperature, current forces, braking, centrifugal.
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