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ESAL, trafficlload analysis & Calculation

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GSM ► Highway & Transportation Engineering ► Traffic Load Analysis - Trcuk Factor &Equivalent Standard Axle Load

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Traffic Load Analysis, ESAL + Truck Factor& Asphalt Institute

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Traffic loading:This is the role of the Pavement Engineer and involves determining theloading on the road to be carried forward to the Pavement Design. The roleof the pavement engineer is to provide an adequate thickness of pavement tocarry the expected loads without deterioration of the network during thedesign life.

The estimated or projected magnitude and occurrence of the various trafficloading are converted to the total number of passes of equivalent standardaxle loading (ESAL), usually the equivalent 80KN (18kips) single axle

load.The total no. of ESAL is used as the traffic loading input for design of  pavement structure.

Determination of cumulative equivalent standard Axle (Road Note 31).

The steps are as follows;

1. Determine the daily traffic flow for each class of vehicle weighed, using the results of thetraffic survey and any other recent traffic count information that is available.

2. Determine the Avg-daily one directional additional traffic flow for each class of vehicle. 

3. Make a forecast of the one directional flow for each class of vehicle to determine the

total traffic in each class that will travel over each lane during design life.

4. Determine the mean equivalence factor for each class of vehicle and for each directionform the result of this axle load survey and any other suveys that have recently beencarried out.

5. the product of the cumulative one directional traffic flows (example, with reference toasphalt institute) for each class of vehicle over the design life of the road and themeanequivalent factor for that class should then be calculated and added together to givethe cumulative equivalent standard axle loading for each direction. The higher of the twodirectional values should be used for design.

 

Asphalt institute:

W

heel

load(single

and

dual)

103k g

Axle

load103k g)

Equivalence

factor

1.5.

3.03.54.04.5...

10

3.016.07.08.09.0...

20.0

0.010.25

0.50.91

1.55..

.56.5

No. of traffic

lanes(TwoDi

rections)

%of truck sindesig

nlane

246

or more

5045(35-

48)40

(25-48)

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