详情

Development of Simplified Factors for Lateral Distribution of Loads of Non-Standard Gauge (NSG) Axles

项目名称：	Development of Simplified Factors for Lateral Distribution of Loads of Non-Standard Gauge (NSG) Axles
摘要：	The Ohio Department of Transportation (ODOT) processes upwards of 335,000 oversized permits annually using the Ohio Hauling Permit System (OHPS). OHPS is an automated permit processing system developed by Promiles, Inc. The OHPS uses the AASHTO Bridge Rating (BrR) system and the AASHTO Rating Tool (RT) to analyze bridges for permit loads. The RT in OHPS assumes all axles have standard gauge (i.e., 6 ft. between tires, weight not exceeding 80,000 lbs.). While a significant amount of the permit applications received falls within the parameters of a standard gauge load, approximately 215,000 applications annually do not. When non-standard gauge (NSG) axle loads are run through OHPS, they generally produce inaccurate results and often fail. Therefore, NSG axle loads applications require rigorous and time-consuming analysis that must be performed manually by ODOT structural engineers. Depending on the proposed route, a single permit application for an NGS axle load can include analysis of up to 180 bridges. In an effort to streamline the analysis of NSG axle loads, ODOT engineers developed a conservative correction modifier of 0.6 that is applied in the AASHTO analysis. Based on experience and engineering judgement, the weight of each axle is multiplied by the correction modifier in an attempt to simulate the use of multiple lanes depending on the width of the axle. The result is a single dimension being used for all NSG axle loads, which is not necessarily accurate. As a result, loads could be disallowed on bridges that are capable of supporting the load and unnecessarily rerouted. The goal of this research is to improve ODOT's processes for analyzing NSG axle load permits. This research will identify a more accurate correction modifier or set of modifiers to use during the NSG axle load analysis. Refined modification factors will provide enhanced confidence in the ability of various structures to safely carry specific NGS axle loads. Incorporating the findings of this research into the OHPS will allow ODOT to be more efficient and accurate in the permitting process.
状态：	Active
资金：	90328
资助组织：	Federal Highway Administration
项目负责人：	Fout, Vicky
执行机构：	Burgess & Niple, Inc.
开始时间：	20210901
预计完成日期：	20220701
主题领域：	Administration and Management；Bridges and other structures；Highways；Motor Carriers