University of Technology-Iraq
Engineering and Technology Journal
1681-6900
28
19
2010
09
28
Increased Damage to Uphill Rigid Pavements from Full- Trailers
الزیادة في تلف الطرق الجاسئة والناتج من المیول الصاعدة للمركبات نوع قاطرة ومتطورة
5919
5937
40584
EN
Sabah
S. Razouki
id
R. Al-Muhanna
Journal Article
2010
09
01
Design charts for truck equivalence factors for full-trailer on uphill rigid
pavements were developed for a terminal level of serviceability pt=2.5. Each chart
is devoted to a certain rigid pavement slab thickness giving the truck equivalence
factor versus the total weight of the full-trailer for an uphill gradient of 0, 6, 12
and 18% as well as a certain ratio of the height of center of gravity of each unit of
the full-trailer to the corresponding wheel base (H/B). Five values for slab
thickness were considered namely D = 6, 8, 10, 12, and 14 inches (15.2, 20.3,
25.4, 30.5, 35.6 cm respectively) and one value for H/B ratio of 1.0 were used.
Due to axle load redistribution on upgrades, the axle loads for the full-trailers
were calculated assuming uniform motion and taking into account the effect of the
moment of the component of the weight of the tractor and trailer unit parallel to
the upgrade and acting at the center of gravity of each unit.A strong linear
correlation between the rolling resistance and total weight of the trailer unit was
obtained to arrive at the pull force in the rod when travelling on uphill pavements.
The paper reveals the significant effect of the upgrade magnitude as well as of
the H/B ratio on the truck equivalence factor. The truck equivalence factors
increase non-linearly with increasing truck weight, H/B ratio and upgrade
magnitude. This increase is quite significant for the higher values of upgrade, H/B
ratio as well as the slab thickness. The critical full-trailer is that having a total
weight exceeding about 400 kN beyond which the corresponding equivalency
factor on uphill pavement diverges significantly from that on level highway.
https://etj.uotechnology.edu.iq/article_40584_3c44e732abf56bd64e2cbe5859e76ddf.pdf