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原文传递 Effect of Increasing Truck Weight on Bridges.

题名：	Effect of Increasing Truck Weight on Bridges.
关键词：	bridge；weight；crea；ncre；easi；loading；literature；specification；baseline；recommend
摘要：	Legislation has been proposed that will allow a 17,000 lb increase in the maximum gross vehicle weight on the Interstate Highway System. This projects main goal is quantify the effect of this increase on the internal forces to which typical slab-on-girder bridges are subjected. Both the shear and moment in the girders and the in the deck slab due to the truck loadings are investigated. To accomplish this, several configurations for these heavier trucks that have been proposed in the literature are evaluated. The HS20-44 loading with alternate military loading, the HL-93 design loading, and Alabama legal loads are used as baselines for comparison. The project focuses on short and medium span bridges with spans between 20 feet and 150 feet and girder spacings between 4 feet and 10 feet. By comparing the proposed truck configurations with the baseline configurations, the adequacy or deficiency of currentdesign specifications and existing bridges are quantified. Recommendations for the implementation of a policy allowing specifically configured 97,000-lb, six-axle trucks are made. The results of this research will assist Alabama and other state DOTs in providing a path forward for the eventuality of heavier trucks.
报告类型：	科技报告