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A computational framework for viscoelastic analysis of flexible pavements under moving loads
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.ORCID iD: 0000-0002-0596-228X
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.ORCID iD: 0000-0003-0889-6078
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.

Place, publisher, year, edition, pages
2012. Vol. 45, no 11, 1655-1671 p.
Keyword [en]
Finite element, Viscoelasticity, Moving load, Flexible pavement
National Category
Infrastructure Engineering
Research subject
SRA - Transport
Identifiers
URN: urn:nbn:se:kth:diva-104522DOI: 10.1617/s11527-012-9863-9ISI: 000309876200005Scopus ID: 2-s2.0-84869093125OAI: oai:DiVA.org:kth-104522DiVA: diva2:564971
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
In thesis
1. Pavement Response to Moving Loads
Open this publication in new window or tab >>Pavement Response to Moving Loads
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:nbn:se:kth:diva-145321 (URN)978-91-87353-40-6 (ISBN)
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
2. Vehicle-Pavement Interaction
Open this publication in new window or tab >>Vehicle-Pavement Interaction
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Several aspects of vehicle-pavement interaction have been studied and discussed in this thesis. Initially the pavement response is studied through a quasi-static and a dynamic computationally efficient framework under moving traffic loads. Subsequently, a non-stationary stochastic solution has been developed in order to account for the effect of pavement surface deterioration on pavement service life.The quasi-static procedure is based on a superposition principle and is computationally favourable, as it requires only a 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.In the dynamic approach the pavement roughness and vehicle suspension system are linked to a dynamic pavement model in order to account for the dynamic effects of vehicle-pavement interaction on pavement response. A finite element method is employed in order to establish the response function for a linear viscoelastic pavement structure with dynamic effects taken into account. The developed computational procedure is applied to evaluate the effect of the pavement surface roughness on the pavement structure response to truck traffic loadings.Furthermore, the deterioration trends for the flexible pavement surface have been investigated based on field measurements of longitudinal profiles in Sweden. A predictive function is proposed for surface deterioration that is based on the average gradient of yearly measurements of the road surface profiles in Swedish road network. The developed dynamic framework is further elaborated to a non-stationary stochastic approach. The response of the flexible pavement is given for a non-stationary random case as the pavement surface deteriorates in pavement service life, thus influencing the magnitude of the dynamic loads induced by the vehicles. The effect of pavement surface evolution on the stress state induced in the pavement by moving traffic is examined numerically.

Finally the effect of surface deterioration on pavement service life has been investigated and discussed in the thesis by incorporating the proposed prognostic surface deterioration model into a ME design framework. The results are discussed for different case studies with different traffic regimes. It was indicated that the predicted pavement service life decreases considerably when the extra dynamic loads, as a result of pavement surface deterioration, has been taken into account. Furthermore, the effect of performing a predictive rehabilitation process (i.e. resurfacing) has been studied by employing a LCC framework. The application of preventive maintenance was shown to be effective, especially when the deterioration rate is high.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. x, 39 p.
Series
TRITA-TSC-PHD, 14:009
Keyword
Finite element, Viscoelasticity, Moving load, Dynamic axle loads, Road roughness, Flexible pavement, Stochastic
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-156045 (URN)978-91-87353-57-4 (ISBN)
Public defence
2014-12-11, Kollegiesalen, Brinellvägen 8, KTH, Stockholm, 09:00 (English)
Opponent
Supervisors
Note

QC 20141119

Available from: 2014-11-19 Created: 2014-11-18 Last updated: 2014-11-19Bibliographically approved

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Jelagin, DenisBirgisson, Björn

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