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Nedbrytning av vägar: Jämförelse mellan axlar med singel- respektive tvillingmontage
KTH, School of Architecture and the Built Environment (ABE), Transport Science.
2011 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

When designing roads it’s important to know

what loads will be

driven on it. The axles on heavy vehicles can either have super single tires or

dual tires which, according to studies, damage the roads differently. The Swedish

Transport Administration is developing an understanding for the character of

these different kinds of axle and tire types on the loads induced on Swedish

roads. In this thesis a field study was conducted to determine the distribution

between axles with super single tires and axles with dual tires on heavy vehicles.

A highway, a country road and a national road were investigated during the

study. The result showed that the number of trucks with single tire axles, i.e.

those with super single tires, varies between 39 and 48 percent on the different

types of road. That the truck has a single tire axle means that the truck has at

least one axle with single tires in addition to the steering axle. A small study was

conducted to determine the width of tires on heavy vehicles.

A comparison of trucks with single- and dual tire axles was carried out in

terms of degradation of the roads. Permanent deformation of unbound layers and

fatigue cracking were investigated since these degradation mechanisms are

currently used as design parameters in the design of roads. Load values from

Bridge Weight In Motion (BWIM) data were used in the calculations and vehicle

type 113, 123 and 12211 were investigated. Permanent deformation and fatigue

cracking were calculated according to the criteria given in ATB VÄG 2005.

Dissipated Creep Strain Energy (DCSE) has been calculated for the selected

truck types. The study showed that trucks with axles with single tires accelerate

the degradation of the roads. The permanent deformation was almost the same

for the two different kinds of axle types.

Place, publisher, year, edition, pages
2011. , 66 p.
Trita-VBT, ISSN 1650-867X ; 11:06
Keyword [en]
dual tires, super single tire, ATB VÄG 2005, DCSE, permanent deformation, fatigue cracking, BWIM.
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-45983OAI: diva2:453270
Available from: 2011-11-01 Created: 2011-11-01

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