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原文传递 Effects of Hauling Timber, Lignite Coal, and Coke Fuel on Louisiana Highways and Bridges. Final rept.

题名：	Effects of Hauling Timber, Lignite Coal, and Coke Fuel on Louisiana Highways and Bridges. Final rept.
作者：	RANADHIR, A.; ROBERTS, F. L.; SABER, A.; ZHOU, X.
关键词：	Pavement-damage; Trucks-; Economic-impact; Bridges-; Hauling-; Highways-.;Louisiana-; Methodology-; Vehicle-weight; Coal-; Lignite-; Coke-.
摘要：	This study included the development of a methodology to assess the economic impact of overweight permitted vehicles hauling timber, lignite coal, and coke fuel on Louisiana highways and bridges. Researchers identified the highway routes and bridges being used to haul these commodities and statistically chosen samples to use in the analysis. Approximately 1,400 control sections on Louisiana highways carry timber, 4 control sections carry lignite coal, and approximately 2,800 bridges are involved in the transport of these commodities. Three different gross vehicle weight (GVW) scenarios were selected for this study including: 80,000 lb., 86,600 lb. or 88,000 lb., and 100,000 lb. The current GVW is 80,000 lb., the 86,600 lb. GVW is the permitted load for log trucks, and the 88,000 lb. GVW is permitted for lignite coal and coke haulers. The 100,000 lb. GVW for sugarcane haulers is the highest level currently permitted by the state of Louisiana. The methodology for analyzing the effect of these loads on pavements was taken from the 1986 AASHTO design guide and involves determining the overlay thickness required to carry traffic from each GVW scenario for the overlay design period. Differences in the life of an overlay were calculated for different GVW scenarios, and overlay thickness and costs were determined for a 20-year analysis period. These costs were developed for the sample on all control sections included in the study. These present net worth costs were expanded to represent the cost for all control sections carrying each commodity. A suggestion from enforcement personnel caused project staff to perform an additional analysis using one load axle at 48,000 lb. (48-kips), which is the maximum permissible tandem axle load. This analysis showed that 48-kip axles produce more pavement damage than the current permitted GVW for timber trucks and cause significant bridge damage at all GVW scenarios included in the study.
报告类型：	科技报告