SENTRE and TREND attenuator field installations
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SENTRE and TREND attenuator field installations

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  • Alternative Title:
    Safety end treatment and transition end treatment attenuator field installations
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    Construction report
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  • Abstract:
    Arizona's canal network is extensive and necessitates the existence of many short bridges on the highway network. The necessity for maintaining access to adjacent canal roads dictates that any barrier installation intended to shield errant vehicles from the bridge rail hazard must fit within the limited space between the bridge end and the canal road. The available space for such an installation is often less than 35 feet. Energy Absorption Systems, Inc. (EASI) has developed two similar attenuating end terminals, the SENTRE system and the TREND system, for use in such limited space applications. EASI has demonstrated that both their TREND and SENTRE systems meet the dynamic performance requirements set forth in NCHRP 230. The conclusion that these systems conform to dynamic performance specifications is based on full scale crash testing. The length of time, however, that these devices have been formally monitored on highways is not sufficient for validating the adequacy of in-service performance. The objective of this research effort is to evaluate the in-service performance of the TREND and SENTRE attenuator systems when installed on appropriate ADOT projects. Two construction projects, both involving canal bridge rail modification, were selected for test installations. This research effort embraces two separate experimental projects, and hence two experimental project numbers. The SENTRE system was installed and reported to the FHWA as Experimental Project Number AZ-8802 and the TREND system was installed and reported to the FHWA as Experimental Project Number AZ-8803. At the time that the TREND and SENTRE projects were constructed, both systems were classified as Experimental by the FHWA. Although the SENTRE attenuator has since been upgraded to Operational status, both installations will continue to be evaluated for the full two year evaluation period specified in the original workplan. Upon completion of the evaluation period a Final Report will be prepared which contains all in-service performance data. /Abstract from report summary page/
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