详情

Criteria for Restoration of Longitudinal Barriers, Phase II

项目名称：	Criteria for Restoration of Longitudinal Barriers, Phase II
摘要：	In NCHRP Project 22-23, “Criteria for the Restoration of Longitudinal Barriers,” researchers surveyed the states to determine what, if any, formal guidelines they have for the maintenance of guardrails. The research determined that while some states did have guidelines for evaluating existing guardrails to determine whether maintenance was warranted, these guidelines were typically based on judgment and were not supported by underlying research. NCHRP Report 656: Criteria for Restoration of Longitudinal Barriers (a product of Project 22-23) provides guidance to assist maintenance personnel in identifying levels of damage and deterioration to longitudinal barriers that affect operational performance. The researchers evaluated 11 damage modes (including damage due to crashes, environmental deterioration, and other causes) commonly associated with the standard strong steel post W-beam (modified G41S) guardrail; they evaluated these modes through a combination of component testing, pendulum testing, finite element simulation, and full-scale crashtesting. The report includes recommendations for additional research to address additional damage modes for barriers. Similar maintenance guidelines for cable barriers are publicized in NCHRP Report 711, Guidance for the Selection, Use, and Maintenance of Cable Barrier Systems, a product of NCHRP Project 22-25, "Development of Guidance for the Selection, Use, and Maintenance of Cable Barrier Systems.” The objective of this research was to develop more comprehensive guidance to assist maintenance personnel in determining the extent of damage to semi-rigid longitudinal barriers that affects operational performance. The guidance may cover additional strong steel post W-beam guardrail failure modes or other types of longitudinal barriers.
状态：	Completed
资金：	300000
资助组织：	National Cooperative Highway Research Program<==>American Association of State Highway and Transportation Officials (AASHTO)<==>Federal Highway Administration
执行机构：	Roadsafe LLC
开始时间：	20120102
预计完成日期：	20150630
实际结束时间：	20150630
主题领域：	Highways；Maintenance and Preservation；Safety and Human Factors；Terminals and Facilities