Question

For design, the daily car, pickup truck, and light van traffic is 20,000; and the daily truck traffic consists of 200 passes of single-unit trucks with single and tandem axles, and 410 passes of tractor semi-trailer trucks with single, tandem, and triple axles. The axle weights are :cars, pickups, light vans = two 2000-lb single axles;single-unit trucks = 10,000-lb steering, single axle= 22,000-lb drive, tandem axle and: tractor semi-trailer trucks = 12,000-lb steering, single axle,= 18,000-lb drive, tandem axle,= 50,000-lb trailer, triple axle: QUESTION: Using D=10 inches, what is the 18-kip–equivalent single-axle load (18-kip ESAL) for cars, pickups, and light vans,  the 18-kip–equivalent single-axle load (18-kip ESAL) for Single Unit trucks and the 18-kip–equivalent single-axle load (18-kip ESAL) for Tractor Semi-Trailer Trucks?

Answer 1

So we need to find out the design ESALS for different type of vehicle categories

We are given all the information, So put these into a table as follows with axle load per vehicle, number of vehicles

We are not given any growth rate or design year, so we will calculate ESAL's for one day and for one year

So for car, pick up truck and light van, each vehicle has an axle weight of 4000 lb, so 4000 * Number of vehicles /18000 = 4000*20000/18000 = 4444.444 ESALs

Like this calculate for all vehicle types

So we have on a daily basis

ESALS for car, pick up and light van = 4444.4444

ESALS for single unit trucks = 355.556

ESALs for tractor and semitrailier trucks = 1822.2222

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If you want to calculate on a yearly basis, then multiple by 365 and so we will have

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