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Civil Engineering Load Calculations

The document defines equivalent single wheel load (ESWL) as the single wheel load that would cause the same magnitude of vertical deflection or compressive stress at a given depth as a dual wheel load assembly. There are two methods to determine ESWL based on equal stress or equal deflection. The pressure at a depth below the surface from a dual wheel load cannot be calculated as the simple sum of the individual loads, and will be between that value and double the single wheel load.

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595 views8 pages

Civil Engineering Load Calculations

The document defines equivalent single wheel load (ESWL) as the single wheel load that would cause the same magnitude of vertical deflection or compressive stress at a given depth as a dual wheel load assembly. There are two methods to determine ESWL based on equal stress or equal deflection. The pressure at a depth below the surface from a dual wheel load cannot be calculated as the simple sum of the individual loads, and will be between that value and double the single wheel load.

Uploaded by

ashoknr
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Equivalent single wheel load (ESWL)

 Equivalent Single Wheel Load


(ESWL) of the dual wheel load
assembly at a depth, ‘z’ may be
defined as the single wheel load
replacement of the dual wheel
load assembly which will cause
same magnitude of vertical
deflection or same value of
compressive stress at that
depth, z.
 There are two methods for
determination the ESWL , based
on equal stress and equal
deflection.
Equivalent single wheel load (ESWL)
 The Pressure at a certain depth
below the pavement surface
cannot be obtained by
numerically adding the pressure
caused by one wheel.
 The effect is between the single
load and the two times the load
carried by one wheel.
 Up to d/2 each load acts
independently after this stresses
overlap, stresses at any depth
greater than 2S is considered to
a single wheel load of magnitude
2P.
Example: (ESWL)
5000kg

4000kg

3000kg

2000kg

1000kg

10mm 100mm 1000mm 10000mm

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