Pavement Strain from Moving Dynamic 3D Load Distribution

Siddharthan, Raj; Yao, Jian; Sebaaly, Peter E.

doi:10.1061/(asce)0733-947x(1998)124:6(557)

Cited by 143 publications

(65 citation statements)

References 8 publications

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“…For all the sensor groups, the longitudinal strain changes from compression (negative values) to tension (positive values) and back to compression with successive wheel passes, in a trend that is consistent with most available evidence (Huhtala et al 1990;Siddharthan et al 1998;Douglas 1999). The magnitude of the compressive strain prior to the tension peak was much higher than the subsequent compressive strain for the steering wheel, and it was dissipated after the rear axle (Fig.…”

Section: Characteristics Of Pavement Surfacing Layer Interfacial Strasupporting

confidence: 86%

Minimizing Distress on Flexible Pavements Using Variable Tire Pressure

et al. 2001

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ABSTRACT:The potential of variable tire pressure technology to 1ninimize distress on flexible pavements with thin asphalt surfacing layers and peat soil subgrade was evaluated using in-situ stress-strain data. Pavement interfacial strains and corresponding subgrade stresses imposed by a three-axle truck were measured and used to estimate the fatigue life of the surfacing layer. Three levels of tn1ck wheel loads in combination with four tire inflation pressures (350 , 490 , 630 , and 770 kPa) were used to evaluate the potential distress by the single steering wheel and rear dual wheels in tandem. Results suggest that lateral strain clue to the single steering wheel is the 1nost critical to fatigue failure , which is influenced by the viscoelastic nature of asphalt, and therefore tn1ck sp eed and axle configuration are important. Lower tire pressures increased the fatigu e life of the surfacing layer with respect to the rear dual wheels and the steering wheel by up to 200 and 3003, respectively. Haulage tn1cks with systems for managing variable tire pressure such as the central tire inflation systems 1nay therefore enhance the serviceability of pave1nents overlying peat or other soft soil foundations .

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Section: Characteristics Of Pavement Surfacing Layer Interfacial Strasupporting

confidence: 86%

Minimizing Distress on Flexible Pavements Using Variable Tire Pressure

et al. 2001

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“…It is intuitive that vertical contact stresses are more sensitive to changes either of the inflation pressure or of the tire load than are the other two components. Moreover, the ratio of the maximum vertical contact stress to the lateral and longitudinal stress is approximately 10:1.6:0.8 (Siddharthan et al 1998). This means that vertical contact stress is the most significant component.…”

Section: Contact Stressesmentioning

confidence: 89%

“…This means that vertical contact stress is the most significant component. Siddharthan et al (1998) reported that the impact of contact shear stresses on tensile strains at the bottom of asphalt were insignificant. Accordingly, in our FE analysis, transverse and longitudinal shear stress components were neglected.…”

Section: Contact Stressesmentioning

confidence: 99%

Effects of Heavier Truck Loadings amd Super-Single Tires on Subgrades

Salgado¹,

Kim²

2002

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Prepared in cooperation with the Indiana Department of Transportation and Federal Highway Administration. AbstractDue to their efficiency and economy, super-single tires have gradually been replacing conventional dual tires in the trucking industry. According to recent studies, super-single tires generate much higher vertical contact stresses than do conventional dual tires, resulting in larger deformations and more severe damage to the subgrade. In order to better assess the higher stresses generated by super-single tires and their effect on the subgrade, analyses are done taking into account soil plasticity rather than simple elastic analysis. In this study, the effects of super-single tires on subgrades for typical road cross-sections are investigated using plane-strain (2D) and 3D static and dynamic finite element analyses. The analyses focus on the sand and clay subgrades rather than on asphalt and base layers. The subgrades are modeled as saturated in order to investigate the effects of porewater pressures under the most severe conditions. The analyses suggest that current flexible pavement design methods are unconservative for the increased loads imposed by super-single tires on the pavement system. Load Equivalent Factors (LEF) and damage factors for super-single tires are suggested for use of those values in design practice. The effects of overlay and subgrade improvement are investigated in order to mitigate the higher strains generated by super-single tire loadings in the subgrade. Subgrade improvement allows decreasing the adverse effects of super-single tires on the subgrades. FE analyses are also done in order to assess the performance of the Indiana typical pavements for the super-heavy loads (occurred in Texas during 1990s). This investigation is to evaluate how much plastic strain by super-heavy loads occurs in the subgrade and asphalt layers as compared with the super-single tire loadings. Key Wordssuper-single tires, subgrades, flexible pavement, finite element analysis, soil plasticity, porewater pressure, contact stress, overlay, subgrade improvement TECHNICAL SummaryTechnology Transfer and Project Implementation Information TRB Subject Code:62-7 Soil Foundation Subgrades November 2002 Publication No.: FHWA/IN/JTRP-2002/20, SPR-2402 Final Report Effects of Heavier Truck Loadings and Super-Single Tires on Subgrades IntroductionIn the last two decades, use of supersingle tires has slightly increased, with the aim of improving efficiency and economy. Since the contact stresses generated by super-single tires are higher than those of conventional dual tires, this change has caused concern about possible damage to pavements designed based on the current design methods. The higher the contact stresses on the pavement surface, the larger the subgrade deformation, and the more severe the damage to the subgrade.In order to investigate the effects of super-single tire loadings on subgrades for typical Indiana road cross-sections, static and dynamic finite element analyses were performed taking into...

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“…The analytical 3D-Move model [7,8], which is based on a continuum-based finite-layer approach, was used in this study. The 3D-Move Analysis model can account for important pavement factors such as the moving traffic-induced complex 3D contact stress distributions (normal and shear) of any shape, vehicle speed, and viscoelastic material characterization for the asphalt concrete layer.…”

Section: Mechanistic-empirical Analysis Of Unmodified and Polymermodimentioning

confidence: 99%

Mechanical and economical impacts of adding polymers into asphalt mixtures

2017

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Abstract.Load associated fatigue cracking is one of the major distress types occurring in flexible pavements. Flexural bending beam fatigue laboratory test has been used for several decades and is considered an integral part of the Superpave advanced characterization procedure. One of the most significant solutions to sustain the fatigue life for an asphaltic mixture is to add sustainable materials such as polymers to the asphalt mixture. A laboratory testing program was performed on two gap-graded mixtures: unmodified and polymer-modified asphalt mixtures. Strain controlled fatigue tests were conducted according to the AASHTO T321 procedure. The results from the beam fatigue tests indicated that the polymer-modified gap graded mixture would have much longer fatigue life compared to the reference (unmodified) mixture. In addition, a mechanistic analysis using 3D-Move software coupled with a cost-effectiveness analysis study based on the fatigue performance on the three mixtures were performed. Overall, the analysis showed that the polymer-modified asphalt mixture exhibited significantly higher cost-effectiveness compared to unmodified HMA mixture. Although polymer-modification increases the cost of the material, the analysis showed that it is more cost effective than the unmodified mixture.

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Pavement Strain from Moving Dynamic 3D Load Distribution

Cited by 143 publications

References 8 publications

Minimizing Distress on Flexible Pavements Using Variable Tire Pressure

Minimizing Distress on Flexible Pavements Using Variable Tire Pressure

Effects of Heavier Truck Loadings amd Super-Single Tires on Subgrades

Mechanical and economical impacts of adding polymers into asphalt mixtures

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