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DEVELOPMENT OF SITE-SPECIFIC ESAL.
| 题名： | DEVELOPMENT OF SITE-SPECIFIC ESAL. |
| 作者： | Alavi-S; Tavares-MP; Puccinelli-J; Laird-E |
| 关键词： | Accuracy-; Arterial-highways; Axle-loads; Colorado-; Cost-effectiveness; Data-collection; Equivalent-single-axle-loads; Highway-classification; Pavement-design; Rural-highways; Traffic-loads; Trend-Statistics; Weigh-in-motion |
| 摘要： | One of the key input parameters for designing new and rehabilitated pavements is traffic loading which is currently based on the number of equivalent single axle load (ESAL) applications. The Colorado Department of Transportation (CDOT) uses a generalized, averaged, and non-site-specific equivalency factor in calculating the number of ESAL applications. Furthermore, the ESAL applications are developed using a 3-bin vehicle classification scheme instead of the Federal Highway Administration's (FHWA's) recommended 13-bin classification scheme. Lack of site-specific equivalency factors in conjunction with the use of 3-bin vehicle classification has caused under-designing and sometimes over-designing pavements based on inaccurate traffic load data. This study was approved by the CDOT's Research Implementation Committee as a high priority research with the goal of improving the accuracy of the existing and forecasted traffic loads of CDOT's highway network. The overall scope of this project involved examination of those resources directly related to the current statewide ESAL classification system and the generation of this final report discussing the research and analysis conducted and recommendation of procedures required for CDOT to develop and implement a more site-specific ESAL classification system. In this study Nichols Consulting Engineers (NCE) analyzed all available CDOT permanent and portable weigh-in-motion (WIM) data. The analyses indicated that sampling data a few times per year may preclude the installation of new costly permanent WIMs. Adjustment factors developed for reducing the temporal bias from short duration data collection were beneficial for sites. Length data could not be expanded into the FHWA classification scheme but could be used for volume information. NCE developed axle load spectra for each WIM data source and reviewed the historic trends of axle loads from the WIM systems. Equivalency factors were developed to apply to axle load data. Groups were based on functional classification in order to apply monitoring data to segments where no data source was available. NCE evaluated the number of WIM data sources per functional class group and documented the number of WIM sites that will be needed to achieve a desired accuracy. A hierarchy was formulated for new data collection efforts based on functionality of roadway and number of segments that have no monitoring data. WIM data is needed for at least functional class groups rural major collector (07) and urban principal arterial other freeways (12). NCE populated a new and more accurate ESAL design table for use in pavement design and rehabilitation activities. This will result in cost savings to CDOT by increasin |
| 总页数： | 2002/07/01. pp180 (Figs., Tabs., Refs., 10 App.) |
| 报告类型： | 科技报告 |
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