Cox J.E.,Harris Miller Miller and Hanson Inc. |
Menge C.W.,Harris Miller Miller and Hanson Inc. |
Ferguson III J.E.,Harris Miller Miller and Hanson Inc. |
McGhee K.K.,Virginia Center for Transportation Innovation and Research |
Kohler P.M.,401 East Broad St.
41st International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012 | Year: 2012
Our paper describes a statewide quiet pavement noise study performed for the Virginia Department of Transportation and Virginia Center for Transportation Innovation and Research. Measurements were conducted in conformance with American Association of State Highway and Transportation Officials recommendations for roadway wayside noise measurements using the Continuous-Flow Traffic Time-Integrated Method (proposed May 2011 TP 99-12 standard). Measurements were performed for four demonstration projects throughout Virginia; each study area consisted of several successive test sections along a major local roadway. Two sets of measurements were made, one with the original roadway surfaces and another with new quiet pavement (mostly porous friction course) or control (mostly stone matrix asphalt) surfaces. Our paper includes direct comparisons of wayside traffic noise levels between the new and original roadway surfaces as well as site-normalized relative comparisons of noise levels between the quiet pavement and control test sections. Variations in traffic volumes are also addressed. Noise levels in the quiet pavement roadway sections were generally 2 to 5 decibels (A-weighted) lower than the control sections. One test section in Leesburg performed particularly well, with wayside traffic noise levels almost 8 decibels lower than the control section; we report supplemental on-board sound intensity measurements supporting this result. Copyright © (2012) by the Institute of Noise Control Engineering (INCE).
Xu J.,University of Virginia |
Lambert J.H.,University of Virginia |
Tucker C.J.,401 East Broad St.
Journal of Transportation Engineering | Year: 2014
Access management in transportation planning can reduce crashes, increase route capacities, and reduce travel times. The literature suggests a need for performance metrics and a decision-aiding framework to guide access management programs across large corridor networks and diverse time horizons. This paper describes a quantitative framework to support access management programs that focus on safety, applying multicriteria analysis, and cost-benefit analysis with parameter uncertainties. The metrics used to assess relative needs at existing access points include crash exposure, crash intensity, traffic exposure, and costs of typical access management activities. Uncertain parameters that influence the estimates of the potential benefits and costs are identified and treated via a numerical interval analysis. The framework is demonstrated at several geographic scales and locations including 7,000 km of highways of a 110,000-km2 region and its several subregions. The results assist decision makers to prioritize which route segments should be addressed sooner and investigated further by elicitation and collection of additional data, reserving right of way, closing access points, planning new alignments, facilitating developer proffers, etc. This approach that combines multicriteria analysis with cost-benefit analysis is transferable to other topics involving transportation engineering and resource allocation. © 2013 American Society of Civil Engineers.
Kim W.S.,401 East Broad St. |
Borden R.H.,North Carolina State University
Geotechnical Testing Journal | Year: 2014
The compressibility of compacted soils is not only a function of soil type and density but also stress state, which is influenced by the existing matric suction and can be described using the fundamentals of unsaturated soil mechanics. This paper presents data from double-odometer tests on low-plasticity clay that demonstrates the effects of dry density and water content on volume-change behavior. Using the data set developed, the drained constrained modulus is determined using the stress-strain relations obtained from conventional odometer tests on soaked specimens, as well as specimens at their molding moisture content. The change of modulus with respect to degree of saturation is discussed and placed in context with the model used in the Guide for Mechanistic-Empirical Design of New and Rehabilitated Pavement Structures [ARA, ERES Consultants Division, 2004, "Guide for Mechanistic-Empirical Design of New and Rehabilitated Pavement Structures," Final Report NCHRP Project 1-37A, Transportation Research Board of the National Academies, Washington, D.C.]. A procedure for predicting the undrained modulus from the constitutive relation for drained loading and the predicted excess pore pressure caused by loading based on a modification of Hilf's equation [Hilf, J. W., 1948, "Estimating Construction Pore Pressures in Rolled Earth Dams," Proceedings of the 2nd International Conference on Soil Mechanics and Foundation Engineering, Vol. 3, International Society for Soil Mechanics and Foundation Engineering (ISSMGE), London, pp. 234-240] is also presented and discussed. Copyright by ASTM Int'l (all rights reserved).
Cacamis M.E.,401 East Broad St. |
El Asmar M.,Arizona State University
Practice Periodical on Structural Design and Construction | Year: 2014
The construction industry represents around 5% of the U.S. gross domestic product (GDP). The scores of baby boomers beginning to retire in the engineering and construction industries are taking a lifetime of institutional knowledge with them. This scenario results in a relatively limited supply of experienced personnel. Partnering is one potential solution to overcome this problem. This paper makes the case that advancing the emotional intelligence (EI) of project participants can improve the partnering effort and ultimately result in increased project performance. This improved performance, to some extent, mitigates the effects of the loss of institutional knowledge. This paper introduces a people-based model that holistically illustrates the components and activities necessary to take a construction project from inception to successful completion. The authors also evaluated contractors who have partnered with the Virginia DOT (VDOT) and found that managers of successful projects exhibited high EI scores. Improving the EI of project participants is for the good of the individuals and provides the additional benefit of improved relationships. This paper sheds light on the state of practice of sociopsychological concepts in the construction workplace to create awareness and develop behaviors that promote productive project relationships. © 2014 American Society of Civil Engineers.