Bridges

Cover of Proposed Methodology for Upgrading Bridge Barriers
Proposed Methodology for Upgrading Bridge Barriers
  • Publication no: ABC-MAR104-14
  • Published: 22 October 2014
The AS 5100 Standard provides requirements for multiple-performance-level barriers. Historical barriers constructed before 1970 generally do not meet modern requirements for safety. This paper builds on ongoing previous research projects within VicRoads which include the VicRoads research report on ‘Upgrading sub-standard bridge barriers’ 2004 and the ARRB paper on ‘Bridge barriers - towards national standards’ 2006. The report describes typical details of substandard barrier types in Victoria and classifies them into various performance levels. This paper updates details and practices for retrofitting or upgrading the bridge barrier by strengthening to the new MASH 2009 heavier test vehicle performance requirements. It also includes updates to the higher-performance-level barriers as affected by changes in size and mass of local vehicles since the AS 5100.2004 implementation as incorporated in the new draft AS 5100 Bridge Standard. The paper introduces a strategy for upgrading such barriers by considering both risk and cost aimed at facilitating such improvements.The retrofit barrier proposals detailed are intended to align with the changing roadside vehicle environment in order to improve roadside safety.