Lecture notes in Transportation Systems Engineering
3 August 2009
A and B are the critical locations for tensile strains . Maximum
value of the strain is adopted for design.
C is the critical location for the vertical subgrade strain
since the maximum value of the
occurs mostly at C.
Fatigue Criteria:
Bituminous surfacings of pavements display flexural fatigue cracking if the
tensile strain at the bottom of the bituminous layer is beyond certain limit.
The relation between the fatigue life of the pavement and the tensile strain in
the bottom of the bituminous layer was obtained as
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(3) |
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(4) |