Analysis and Determination of Axle Load Spectra and Traffic Input for the M-e Pdg - 2008
Traffic Load Analysis
Transcript of Traffic Load Analysis
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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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