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Procedures for the Estimation of Pavement and Bridge Preservation Costs for Fiscal Planning and Programming

机译：财政规划和规划的路面和桥梁养护费用估算程序

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Facility preservation generally refers to the set of activities that are carried out to keep a facility in usable condition until the next reconstruction activity. For fiscal planning and programming, it is necessary to know the expected costs of preservation projects and how long they would last. Such information, coupled with minimum standards and facility inventory data enable estimation of overall monetary needs for bridge and pavement preservation, and would assist INDOT in undertaking appropriate programming and attendant financial planning over the long term. However, detailed engineering analyses are not possible every year because of the time and effort involved, therefore simple procedures to help estimate annual pavement and bridge preservation needs are useful for long-term fiscal planning. The study methodology consisted of first undertaking a full analysis based on engineering principles and detailed work in order to determine pavement and bridge needs for a period of time. Then simple procedures to estimate yearly pavement and bridge preservation costs were developed and the results were compared to the detailed engineering needs. Deterioration and cost models to establish engineering needs were developed using an array of statistical techniques including analysis of variance and regression analysis. Using the deterioration models, system inventory and minimum standards, the level of physical needs was determined for the entire pavement and bridge network over the analysis period. Finally, using the identified physical needs and developed cost models, the monetary needs were estimated. An age-based approach (that considers fixed time intervals instead of deterioration trends and minimum standards) was used for the bridge preservation needs. Based on the historical expenditure records and the amount of work performed in the past, simple regression models were developed to estimate future annual pavement and bridge preservation needs. The results obtained proved to be consistent with the engineering analysis.
机译：设施保存通常是指为使设施保持可用状态直到下一次重建活动而进行的一组活动。对于财政计划和计划编制，有必要知道保护项目的预期成本以及它们将持续多长时间。这些信息，加上最低标准和设施清单数据，可以估算出桥梁和路面养护的总体资金需求，并将长期帮助INDOT进行适当的编程和相关的财务规划。但是，由于涉及到的时间和精力，每年无法进行详细的工程分析，因此，用于估算年度铺装和桥梁养护需求的简单程序对于长期财务计划很有用。研究方法包括首先根据工程原理和详细工作进行全面分析，以确定一段时间内的路面和桥梁需求。然后，开发了估算年度路面和桥梁养护成本的简单程序，并将结果与​​详细的工程需求进行了比较。使用一系列统计技术（包括方差分析和回归分析）开发了满足工程需求的劣化模型和成本模型。使用恶化模型，系统清单和最低标准，确定了分析期间整个人行道和桥梁网络的物理需求水平。最后，使用已确定的实际需求和已开发的成本模型，估算了货币需求。基于年龄的方法（考虑固定的时间间隔，而不是恶化趋势和最低标准）被用于桥梁保护需求。根据历史支出记录和过去完成的工作量，开发了简单的回归模型来估算未来的年度人行道和桥梁养护需求。所得结果证明与工程分析一致。

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