The objective of the study is to develop a reconstruction procedure for pole accidents in which the struck pole was partially or completely fractured. Alternative reconstruction approaches were evaluated and an analytical model based on a three-phase collision sequence was selected for further development. The total vehicle velocity change is considered as the sum of three components: (1) crushing of vehicle prior to pole fracture, (2) partial or complete fracture of pole at its base, and (3) if breakaway occurs, acceleration of the segmented pole structure by the impacting vehicle. The velocity change due to vehicle crush is obtained from the CRASH reconstruction program. Base fracture energy required for partial or complete fracture for various pole types was extracted from results of pendulum tests available from the literature and used in the determination of vehicle velocity change due to pole fracture. Mathematical equations were developed for calculating the velocity change as a result of the pole inertial effect. Five full-scale crash tests were used in testing and validation of the reconstruction procedure. Results from film analysis of the crash tests were compared with those obtained from the reconstruction procedure and the correlation was good with an average deviation of approximately 6 percent underestimation.

  • Corporate Authors:

    Southwest Research Institute

    6220 Culebra Road, P.O. Drawer 28510
    San Antonio, TX  United States  78228-0510

    National Highway Traffic Safety Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Mak, K K
    • Labra, J J
  • Publication Date: 1980-11

Media Info

  • Features: References;
  • Pagination: 119 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00329076
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: SWRI-11-8090 Final Rpt., HS-805 663
  • Contract Numbers: DTNH-22-80-C-07014
  • Files: HSL, NTIS, USDOT
  • Created Date: May 21 1982 12:00AM