VALUATION OF SEISMIC PERFORMANCE ON POLYETHYLENE PIPE INCLUDING JUNCTIONS AND BENDS DURING AN EARTHQUAKE

• NISHIKAWA Gentaro

  京都大学大学院 工学研究科

• SHIOHAMA Yuichi

  積水化学工業株式会社

• SUZUKI Tsuyoshi

  積水化学工業株式会社

• ONUMA Hiromoto

  大沼水道技術研究所

• KIYONO Junji

  京都大学大学院 地球環境学堂

Bibliographic Information

Other Title

• 地震時における水道配水用ポリエチレン管の異形管・給水分岐の耐震性評価

Abstract

 Evaluation of seismic performance on buried pipeline changes whether the pipe slips against the surrounding soil or not. When slippage takes place, stress and strain concentrate to junctions and bends. Important factors of slip or not-slip are critical shear stress of soil (τ_cr) and elasticity of pipe materials. Previous experiments by our group have shown that polyethylene pipe (HPPE) does not slip in the soft ground during severe earthquake. By contrast, HPPE slips a little in solid ground because of the short wavelength. In this study, we estimated the influence of slippage against junctions and bends. Our results are as follows: (1) τ_cr of HPPE with accessories including a coupler and branch saddle is 10.8kN/m² - 19.5kNm² because these accessories function as resistance in the soil. (2) Maximum slippage of HPPE is approximately 12.5mm in the solid soil. (3) we confirmed that there are no leakage from the branch saddle and the strain acting on the pipe with accesories and bends is enough small even in case HPPE slips. Through this study, the evaluation of seismic performance on polyethylene pipeline as the water pipeline were completed.

Journal

• Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))

  Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 73 (4), I_412-I_421, 2017

  Japan Society of Civil Engineers

Keywords

• buried pipeline
• polyethylene pipe
• critical shear stress
• relative displacement

Details

• CRID: 1390282680327584640
• NII Article ID: 130006088674
• DOI: 10.2208/jscejseee.73.i_412
• ISSN: 21854653
• Web Site: https://www.jstage.jst.go.jp/article/jscejseee/73/4/73_I_412/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed