The Structural Engineer's Corner

Eng. Onorio Francesco Salvatore

Traffic loads on road bridges: division of the carriageway into notional lanes according to Australian Standard 5100.2

Written By: Lexatus - Nov• 14•13

Traffic loads 16 - Onorio

The load models defined in the Australian Standard 5100.2 shall be assumed to occupy one standard design lane of 3.2 m width. The number of standard design lanes is defined as:

n = b / 3.2 (rounded down to next integer)

where:

n = number of standard design loads;

b = width between traffic barriers, in metres, unless specified otherwise.

The Code standard design lanes shall be positioned laterally on the bridge to produce the most adverse effects.

For multiple lanes, the A160, M1600 or S1600 loading shall be multiplied by an accompanying lane factor as follows:

1 LANE LOADED

ALF = 1.0

2 LANES LOADED

For the first lane, ALF1 = 1.0;

For the second lane, ALF = 0.8.

3 LANES LOADED

For the first lane, ALF1 = 1.0;

For the second lane, ALF = 0.8;

For the third and subsequent lanes, ALF = 0.4

Should be noted that:

– the “first lane” is the loaded lane giving the largest effect;

– the “second lane” is the loaded lane giving the second largest effect;

– the “third lane” is the loaded lane giving the third largest effect.

Hence, the number of standard design lanes loaded as well as the load numbering shall be selected to produce the most adverse effects.

Additionally, for bridges that support vehicle and pedestrian traffic, the accompanying load factors shall be applied to both the vehicle and the pedestrian traffic. The total pedestrian load shall be considered as one standard design lane.

For any issues or questions, you can contact the author at:

onorio@strutturista.com

Eng. Onorio Francesco Salvatore

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