详情

Development of Guidelines to Establish Effective and Efficient Timelines and Incentives for ABC

项目名称：	Development of Guidelines to Establish Effective and Efficient Timelines and Incentives for ABC
摘要：	Reduction of road closure times, traffic disruption and user costs, in addition to improvements in construction quality and utilizing prefabricated elements, are all attractive qualities of the implementation of accelerated bridge construction (ABC) techniques that encourage the transportation agencies to use the technique for repair and replacement projects. ABC helps minimize onsite construction activities, results in decreasing the long-term presence of contractor related equipment, labor, and staging areas and consequently can decrease driver distractions and traffic disruptions that reduce the safety and mobility efficiencies of the transportation network. The total cost of bridge replacement includes the direct costs which are commonly identified as the design, materials, and construction cost and indirect costs that are costs associated with the lower quality of network performance (due to traffic delays or longer reroutes) and opportunity losses that represent the socio-economic (and event environmental) losses due to the closure. The total cost of construction of the bridge is the addition of these two. One should note that some traffic safety issues also lead to inevitable costs, such as accidents occurring because of partial lane closures and drivers unfamiliar to the detour route. This underlines the importance of implementing effective strategies to repair/replace the bridges in the shortest possible time. Oftentimes long detours present opportunities where the use of ABC methods can provide more practical and economical solutions to those available with conventional construction methods. Two time metrics are used when determining the amount of impact to the road user: i) Onsite construction time, which is the period of time when a contractor alters the project site location until all construction related activities are removed. This includes, but is not limited to, the removal of maintenance of traffic items, construction materials, equipment, and personnel; and ii) mobility impact time which is any period of time the traffic flow of the transportation network is reduced due to onsite construction activities (FHWA). The mobility impact time is classified to five tiers: 1) traffic impacts within 1 to 24 hours; 2) traffic impacts within 3 days; 3) traffic impacts within 2 weeks;, 4) traffic impacts within 3 months; and 5) overall project schedule is significantly reduced by months to years. Each tier dictates the type of technology the owner will use. For example, a Tier 1 project would use a slide-in construction method, whereas a Tier 3 project would require on-site assembly of prefabricated bridge elements and systems.
状态：	Completed
资金：	48000
资助组织：	Office of the Assistant Secretary for Research and Technology
管理组织：	Department of Transportation
项目负责人：	Azizinamini, Atorod
执行机构：	Accelerated Bridge Construction University Transportation Center (ABC-UTC)
主要研究人员：	Shane, Jennifer
开始时间：	20170601
预计完成日期：	20190531
实际结束时间：	20190531