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<p>Dissipators are the components that are integrated into the flexible net barrier to absorb the impact energy during rockfall events. Upon impact, the dissipator experiences dynamic loads which makes its quasi-static characterization under low loading rate not totally adequate to describe their behavior observed on-site. This article aims to address this gap by conducting new high loading rate tests on snake dissipators under conditions that closely replicate real-case rockfall scenarios, enabling a more accurate characterization of their performance. A dynamic mechanical model of this dissipator was established and compared to the quasi-static one. This comparison highlighted the presence of a dynamic effect in the response of the snake dissipator indicating the inaccuracy of the use of quasi-static characterization. In addition, a loss of snake dissipator effectiveness was observed under dynamic loading compared to the expected effectiveness retained under low loading rate. This decrease indicates an overestimation in the performance of the snake dissipator in the flexible barrier when relying only on quasi-static characterization. Moreover, the numerical simulations also highlighted the sensitivity of the performance of the barrier by the dissipator mechanical model.</p>

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Highlighting the Dynamic Effect on Dissipator by Friction Installed in Flexible Barriers

  • 期刊论文

  • 发表日期：

    2025年6月5日

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  • Ali Osairan,
  • Marie-Aurelie Chanut,
  • Marion Bost,
  • Christophe Pruvost,
  • Mathieu Verdet,
  • Loic Dugelas

摘要

Dissipators are the components that are integrated into the flexible net barrier to absorb the impact energy during rockfall events. Upon impact, the dissipator experiences dynamic loads which makes its quasi-static characterization under low loading rate not totally adequate to describe their behavior observed on-site. This article aims to address this gap by conducting new high loading rate tests on snake dissipators under conditions that closely replicate real-case rockfall scenarios, enabling a more accurate characterization of their performance. A dynamic mechanical model of this dissipator was established and compared to the quasi-static one. This comparison highlighted the presence of a dynamic effect in the response of the snake dissipator indicating the inaccuracy of the use of quasi-static characterization. In addition, a loss of snake dissipator effectiveness was observed under dynamic loading compared to the expected effectiveness retained under low loading rate. This decrease indicates an overestimation in the performance of the snake dissipator in the flexible barrier when relying only on quasi-static characterization. Moreover, the numerical simulations also highlighted the sensitivity of the performance of the barrier by the dissipator mechanical model.