What is the standard axle load?

What is the standard axle load?

Legal axle load: The maximum allowed axle load on the roads is called legal axle load. For highways the maximum legal axle load in India, specified by IRC, is 10 tonnes. Standard axle load: It is a single axle load with dual wheel carrying 80 KN load and the design of pavement is based on the standard axle load.

How to calculate equivalent axle load?

The equation outputs are load equivalency factors (LEFs) or ESAL factors….For example, given a flexible pavement with SN = 3.0 and pt = 2.5:

1. A 18,000 lb (80 kN) single axle, LEF =1.0.
2. A 30,000 lb (133 kN) single axle, LEF = 7.9.
3. Comparing the two, the ratio is: 7.9/1.0 = 7.9.
4. Using the fourth power rule-of-thumb:

What is load equivalency factor?

Load equivalency factor (abbreviated further as LEF) express the ratio of vehicle number to the number of 100 kN equivalent standard axle. In the analysis load equivalency factors were calculated for each vehicle separately.

What is axle load in highway?

The axle load of a wheeled vehicle is the total weight bearing on the roadway for all wheels connected to a given axle.

What is a standard axle?

Equivalent Standard Axle (ESA): Is the empirical process used for the design thickness of granular pavements with thin bituminous surfacings.

What is the standard wheel load in WL factor?

What is the standard wheel load in Ewl factor? Explanation: The load is considered for only one wheel which is 4080kg, it is considered as the half of the legal load. Explanation: The rate of growth in traffic for urban areas is assumed as 7.5%, it may also vary depending on the requirement.

What is the formula for equivalent wheel load factor?

The centre to centre spacing and clear space in dual wheels are 30 cm and 10 cm respectively. Calculate the equivalent single wheel load or ESWL for pavement thickness 20 cm, 40 cm and 70 cm. Where, P is the wheel load (single wheel load) = 5500/2 = 2750 Kg.

How is EASL calculated?

Annual ESALs are computed by multiplying the daily ESAL by 300 for low-volume roads or 365 for high-volume roads. Compute the 20-year ESAL by multiplying the annual ESALs by 20. This number is then input into pavement design calculations.

How do I know my axle load?

Simply subtract the kerb weight of each axle from the maximum legal axle weight figure on the plate. The difference between the two figures is the maximum load that can be carried on each axle.

What is maximum axle weight?

20,000 pounds
General Rule. 35550. (a) The gross weight on any one axle shall not exceed 20,000 pounds, and the gross weight upon any one wheel, or wheels, supporting one end of an axle, shall not exceed 10,500 pounds.

How much weight can a 3500 lb axle carry?

7,000 pounds
The carrying capacity of two 3,500 pound axles is 7,000 pounds. The axles support not only the cargo’s weight but also the weight of the trailer’s frame and body.

What will happen if same size of axles are used?

The larger the ratio the greater the multiplication of force (torque) created or distance achieved. By varying the radii of the axle and/or wheel, any amount of mechanical advantage may be gained.

How are load equivalency factors used in pavement design?

Using the ESAL method, damage from all loads (including multi-axle loads) are converted to damage from an equivalent number of 18,000 lb. single axle loads, which is then used for design. A “load equivalency factor” represents the equivalent number of ESALs for the given weight-axle combination.

Is it difficult to determine the axle load of a vehicle?

Although it is not too difficult to determine a wheel or an axle load for an individual vehicle, it becomes quite complicated to determine the number and types of wheel/axle loads that a particular pavement will be subject to over its design life.

How are single axle loads converted to equivalents?

Equivalent single axle loads (ESALs). This approach converts wheel loads of various magnitudes and repetitions (“mixed traffic”) to an equivalent number of “standard” or “equivalent” loads. Load spectra. This approach characterizes loads directly by number of axles, configuration and weight. It does not involve conversion to equivalent values.

How is the life of flexible pavement determined?

Flexible pavement is designed based on axle load limits and climatic conditions. The Egyptian code has specified certain load limits that should not be exceeded. The overweight trucks cause severe deterioration to the pavement and thus reduce its life.