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HA and HB loading

HA and HB loading

(OP)
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?

RE: HA and HB loading

HA loading is modelled as an equivalent UDL plus a knife edge load.

HB loading is from a single abnormal vechicle.

The design should be for the worst case of the two.

If you can get a copy of BS5400 pt 3 it is explained in detail.

Kieran
 

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