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Pavement Response to Moving Loads
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The response of flexible pavements at vehicle-road interaction has been studied in this thesis. A quasi-static and a dynamic framework for analysing the pavement structure under moving load has been developed. Both frameworks are general, robust and computationally efficient.

The quasi-static procedure is based on superposition principle and is computationally favourable, as it requires only reduced incremental problem to be solved numerically. Using the developed framework the effect of vehicle configuration and traffic characteristics on the damage induced in pavements is investigated numerically. It is shown that the developed numerical model provides a more accurate explanation of different distress modes. Moreover the conventional analysis and design methods with layered linear elastic behaviour assumption for asphalt layer are unable to capture several important aspects of pavement response.

In the dynamic analysis approach the pavement roughness and vehicle suspension system is linked to a dynamic pavement model in order to account for the dynamic effects at vehicle-road interaction on pavement response. A finite element method is relied upon in order to establish the response function for a linear viscoelastic pavement structure with dynamic effects taken into account. The computational procedure developed is applied to evaluate the effect of the pavement surface roughness on the pavement structure response to truck traffic loading. Stress field parameters governing fracture initiation in asphalt layers are reported for two measured road roughness profiles. It is shown that the dynamic effects at vehicle-road interaction may have a profound influence on the stresses induced in flexible pavements; therefore these effects need to be taken into account for accurate prediction of the road performance in the field.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. , v, 20 p.
Series
TRITA-TSC-LIC, ISSN 1653-445X ; 14:002
National Category
Infrastructure Engineering
Identifiers
URN: urn:nbn:se:kth:diva-145321ISBN: 978-91-87353-40-6 (print)OAI: oai:DiVA.org:kth-145321DiVA: diva2:717587
Presentation
2014-05-22, B1, Brinellvägen 23, KTH, Stockholm, 09:00 (English)
Opponent
Supervisors
Note

QC 20140516

Available from: 2014-05-16 Created: 2014-05-15 Last updated: 2014-05-16Bibliographically approved
List of papers
1. A computational framework for viscoelastic analysis of flexible pavements under moving loads
Open this publication in new window or tab >>A computational framework for viscoelastic analysis of flexible pavements under moving loads
2012 (English)In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 45, no 11, 1655-1671 p.Article in journal (Refereed) Published
Abstract [en]

A general quasi-static computational procedure is established to evaluate stresses and strainsinduced in the viscoelastic flexible pavement bymoving traffic. The procedure is based on superposition principle and is computationally favourable, as itrequires only reduced incremental problem to besolved numerically. The impact of traffic speed anddensity on the mechanical response of flexible pavement is examined numerically. Results relevant fortwo major modes of pavement’s distress, i.e. crackingand rutting, are reported. It is shown that the state-ofpractice layered elastic analysis used in pavementdesign is unable to capture several important qualitative and quantitative aspects of pavements response.

Keyword
Finite element, Viscoelasticity, Moving load, Flexible pavement
National Category
Infrastructure Engineering
Research subject
SRA - Transport
Identifiers
urn:nbn:se:kth:diva-104522 (URN)10.1617/s11527-012-9863-9 (DOI)000309876200005 ()2-s2.0-84869093125 (Scopus ID)
Funder
TrenOp, Transport Research Environment with Novel Perspectives
Note

QC 20121203

Available from: 2012-11-05 Created: 2012-11-05 Last updated: 2017-12-07Bibliographically approved
2. Impact of Long and Heavy Vehicles on Pavement Damage
Open this publication in new window or tab >>Impact of Long and Heavy Vehicles on Pavement Damage
2013 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In the present paper the effect of vehicle configuration and traffic characteristics on the damage induced in pavements by traffic is investigated numerically. A three dimensional time-dependent pavement-vehicle interaction analysis is performed in order to study the impact of the parameters mentioned above on the mechanical response of flexible pavements. The analysis is based on a fast and robust computational procedure, developed by the authors. The numerical algorithm utilizes the three-dimensional finite element solution of the reduced problem of one tyre pavement interface loaded with tyre pressure. Afterwards, a superposition procedure based on fast Fourier transform techniques is applied to find the pavement response to moving loads. The method is general and capable of capturing the stress-strain response to any arbitrary loading history.One particular area of study with employing the current procedure is the analysis of long and heavy vehicle impact on pavement damage. Two major modes of distress, i.e. cracking and rutting have been discussed for 6 different truck types with 2 speeds. It is shown that an accurate numerical model provides a more accurate explanation of different distress modes. Moreover the conventional analysis and design methods with layered linear elastic behaviour assumption for asphalt layer are unable to capture several important aspects of pavement response.

National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-116565 (URN)
Conference
TRB annual meeting,January 13-17, 2013,Washington, D.C.
Note

QC 20130201

Available from: 2013-02-01 Created: 2013-01-21 Last updated: 2014-11-19Bibliographically approved
3. Dynamic Response of Flexible Pavements at Vehicle-Road Interaction
Open this publication in new window or tab >>Dynamic Response of Flexible Pavements at Vehicle-Road Interaction
2015 (English)In: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, E-ISSN 2164-7402, Vol. 16, no 2, 256-276 p.Article in journal (Refereed) Published
Abstract [en]

In the present paper a robust and general computational framework that captures the dynamic response of flexible pavements to a moving vehicle is presented. A finite element method is relied upon in order to establish the response function for a linear viscoelastic pavement structure with dynamic effects taken into account. In order to characterise the dynamic loads induced on the pavement by moving traffic, a quarter car model combined with measured road profiles is used. Once both the traffic loads and pavement response functions are known, the stresses and strains induced in the pavement can be obtained in the frequency-wavenumber domain through the convolution procedure. The computational procedure developed is applied in the present study to evaluate the effect of the pavement surface roughness on the pavement structure response to truck traffic loading. Stress field parameters governing fracture initiation in asphalt layers are reported for two measured road roughness profiles. It is shown that the dynamic effects at vehicle-road interaction may have a profound influence on the stresses induced in flexible pavements; therefore, these effects need to be taken into account for the accurate estimation of the road resistance to cracking.

Place, publisher, year, edition, pages
Taylor & Francis, 2015
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-145326 (URN)10.1080/14680629.2014.990402 (DOI)000353473800002 ()2-s2.0-84928209282 (Scopus ID)
Note

QC 20150805

Available from: 2014-05-16 Created: 2014-05-16 Last updated: 2017-12-05Bibliographically approved

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