Journal of South China University of Technology (Natural Science Edition) ›› 2005, Vol. 33 ›› Issue (11): 98-103.

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Experimental Investigation and Optimized Analyses of Highway Guardrails Under Impact Load

Zhao Jia-jian1  Wei De-min1  Tang Li-qun2   

  1. 1.College of Architecture and Civil Engineering,South China Univ.of Tech.,Guangzhou 5 10640,Guangdong,China;2.College of Traffic and Communications,South China Univ.of Tech.,Guangzhou 5 10640,Guangdong,China
  • Received:2004-06-09 Online:2005-11-25 Published:2005-11-25
  • Contact: Zhao Jia-jian(born in 1976)，Ph．D．candidate，mainly researches on construction engineering E-mail:zjj0615@sina.com
  • About author:Zhao Jia-jian(born in 1976)，Ph．D．candidate，mainly researches on construction engineering
  • Supported by:

    Supported by the Provincial Natural Science Foundation of Guangdong(980577,000482)and Transportation Bureau of Guangdong Province

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Abstract:

The dynamic characteristics of highway guardrails under impact loads are investigated by experiments and finite-element analyses.The results indicate that,with the increase of the impact displacement,the impact velocity decreases almost linearly.and the impact acceleration quickly declines to a minimum.Moreover,the energy-absorbing process is divided into two phases.and energy is absorbed much faster in the first phase.An optimized design of the gn ardrails is also carried out by considering the energy-absorbing feature and the initial impact force,concluding that the Thrie beam with the thickness of 1.3 mm and the span of 0.665 m is the opti-mal structure of all selected gn ardrails.

Key words: guardrail, impact force, energy-absorbing feature, optimized design, finite-element method