Could someone please clarify the difference between HA and HB loading please?
A lively debate has begun in our office over what constitutes HB loading and what load to use.
This is what sparked the debate:
From BD37/01 Loads for Highway Bridges, the equivalent UDL for HB loading (45 units) is 20kPa. Using a spec sheet for a 20 ton payload dump truck the weight on the rear axle when loaded is 24300kg. Spreading the load over the area of the rear wheelbase (1.675m x 2.652m) equates to 53kPa - much larger than 20kPa! How is the equivalent UDL of the construction machinery calculated?
A lively debate has begun in our office over what constitutes HB loading and what load to use.
This is what sparked the debate:
From BD37/01 Loads for Highway Bridges, the equivalent UDL for HB loading (45 units) is 20kPa. Using a spec sheet for a 20 ton payload dump truck the weight on the rear axle when loaded is 24300kg. Spreading the load over the area of the rear wheelbase (1.675m x 2.652m) equates to 53kPa - much larger than 20kPa! How is the equivalent UDL of the construction machinery calculated?