Monitoring load distribution and fatigue cost estimates of heavy truck loads on Louisiana state bridges : tech summary.
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2013-11-01
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By Saber, Aziz
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Abstract:TEA 21 (Transportation Equity Act 21) of 1998 allows heavy sugarcane truck loads on Louisiana interstate highways. These heavier loads are currently being
applied to state and parish roads through trucks traveling from and to the processing plants. Generally, commercial vehicle weights and dimensions laws
are enforced by highway agencies to ensure that excessive damage (and subsequent losses of pavement life) is not imposed on highway infrastructures like
bridges. The axle loads and total loads of heavy trucks, which are considered primarily responsible for decreasing the service life of bridges, are signifi cant
parameters of highway traffi c. TEA 21 is allowing sugarcane trucks to haul loads up to 100,000 lb. Because highways and bridges have traditionally been
designed for the legal load of 80,000 lb., permitted trucks of 100,000 lb. or more decrease the expected service life of the infrastructure. During the 2009
regular session, the Louisiana Senate passed a Concurrent Resolution (SCR-35), which urged the Louisiana Department of Transportation and Development
(DOTD) to conduct a pilot study on alternative truck-trailer confi gurations to support the bio-fuels industry. The senate concurrent resolution SCR-35
specifi cally requested that the study include vehicles hauling sugarcane biomass for alternative fuel and electricity generation. During the course of the work,
the American Sugar Cane League indicated that their members requested that the bridge monitoring system be installed around the New Iberia area and the
response to SCR-35 to be limited to theoretical evaluations.
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