This paper examines the transient stress analysis of a multilayer pavement stmcture subjected to heat conduction and asssciated thefanoelastic effects by the cooling of its surface. In particular, the layered structure contains a transverse crack which can be created either during the construction of the pavement or during its service life-The numerical treatment of the transient stress analysis is achieved using a finite element scheme, which models the heat conduction and thermoelasticity of each component in the layered system and the singular stress field at the extremities of a crack. The numerical scheme is applied to examine the manner in which the propagation of ar m existing crack is influenced by the thermoelastic mismatch between the layers adjacent to the crack location. The analysis also illustrates the influence of the thermselastic mismatch between a cracked pavement and an overlay, in the suppression of crack propagation.Key words: fracture mechanics, pavement structures, low-temperature fracture, transient thermal effects, finite element modelling, stress intensity factors.Le grdsent article traite d'une amlyse des contraintes transitoires d'une chaussCe multicsuche qui a Ct C soumise h la conductisn de chaleur et a subi les effets thermoCiastiques associh au refrsidissement de sa surface. De f a~o n plus prCcise, B e systkme en couches comporte une fissure transversale crCCe soit durant la constmctisn de la chaussCe, soit durant sa durCe de vie utile. Le traiternent numCrique de I'analyse des contraintes transitoires est rCalisC par la rnCthode des 61Cments finis qui pemet de modCliser la conduction de chaleur et la thermoClasticitC de chaque composante d'une systkme en couches, ainsi que le champ des contraintes aux extrCmitCs d'une fissure. Le processus numCrique est utilisC pour examiner comment les conditions de propagation d'une fissure existante ssnt influenckes par le d6sCquilibre thermoklastique entre Bes couches adjacentes h la fissure. L9analyse dCmontae Cgalement l'effet du dCsCquilibre thermoClastique entre une chausske fissurCe et un aecouvrement, dans B'Climination de la propagation des fissures.
In order to reduce customer hours lost (CHL) and customer interruptions (CI), the use of Faulted Phase Earthing (FPE) is being considered on the Irish 20kV distribution system. The operation of this particular FPE system is enabled by the use of a custom built Earth Fault Controller (EFC) that has the ability to detect high impedance faults of up to 12kΩ. The EFC can also successfully identify single pole switching events, which have at times caused the mal-operation of existing protection. FPE involves the earthing of a faulted phase during a single line to ground fault. This ensures that the fault site is made safer and that no customers are interrupted during the fault. This paper details the algorithms associated with the EFC and outlines simulated tests which highlight the EFC's sensitivity and ability to discriminate between high impedance earth faults and single pole switching events.
Ontario emphasizes preservation of their highway system by carrying out maintenance activities aimed at prolonging the life of highway pavements. To make the maintenance task easier and more effective, a set of guidelines was developed that helps maintenance staff make the best decision, one that is most cost-effective and one that is made consistently by different maintenance staff. For the most part, the guidelines deal with short-term measures-deficiencies that have to be fixed right now, that is, corrective maintenance. But they can also be used to identify situations where preventive maintenance will affect the service life of the pavement. The guidelines contain the following elements: (1) identification process, (2) treatment selection, and (3) performance standard. This paper describes our current practice of identifying and classifying a typical deficiency, selection of the most cost-effective treatment, the specifications for equipment and materials needed to carry out the treatment, and the proper work methods. As a typical example, this paper will describe flexible pavement crackings and cracks that are routed and sealed as the prescribed treatment.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.