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Analysis of damaged transmission tower due to natural hazards: Evaluation of soundness recovery after restoration

Research Project

Project/Area Number 19K04566
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 22020:Structure engineering and earthquake engineering-related
Research InstitutionTohoku University

Principal Investigator

Yamakawa Yuki  東北大学, 工学研究科, 准教授 (80324010)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords送電鉄塔 / 電力インフラ / 耐災害性 / 損傷・修繕シミュレーション / 構造物の健全性評価 / 耐荷力 / 部材損傷 / 基礎不同変位
Outline of Research at the Start

社会経済活動が安定的な電力供給に強く依存している現在,送電鉄塔は電力インフラの基盤施設であり,高い信頼性が求められる.しかし,地盤変状や強風に起因する送電鉄塔の損傷・崩壊事故が頻繁に発生している.
この現状に鑑み,本研究では過酷な自然ハザード事象における過大荷重作用下での送電鉄塔の損傷・崩壊機構を解明し,耐災害性を評価する.さらに損傷後の部材交換などを模擬した修繕シミュレーション解析を行い,修繕による性能回復程度を定量的に明確化する.
その結果に基づいて,災害後の点検業務に適用しうる健全性判定基準,ならびに修繕効果を定量保証した形で修繕方法の策定を支援する実用性の高い手法の構築を試みる.

Outline of Final Research Achievements

This study examined the progress of damages and the ultimate strength of transmission tower subjected to excessive loads due to strong winds and foundation displacement due to ground deformations using 3D finite element analysis, especially focusing on the distribution of damaged members and the accompanying strength degradation. We then performed repairing analysis of the damaged tower, which simulated repair measures by replacing damaged members and removing foundation displacement, and thereby evaluated the degree of strength recovery after the repair. The analysis result revealed that the efficacy of repair significantly depends not only on the repair methods but also on the distribution of damaged members associated with the cause of damage. This implies that the proper choice of repair measures according to damaged state is crucially important for effective recovery of the tower strength.

Academic Significance and Societal Importance of the Research Achievements

本研究では,強風荷重や脚部不同変位による鉄塔の損傷挙動と耐荷力低下について有限要素解析により評価した.さらに,損傷が生じた鉄塔に対して修繕を模擬した解析を行い,修繕による耐荷力回復程度の定量評価を試みた.その結果,修繕方法によって修繕効果に顕著な相違がみられ,損傷要因や損傷形態に応じて修繕方法を適切に選択することの必要性が示唆された.本研究により,修繕後の性能回復程度の定量評価が可能となった.この成果は,損傷要因や損傷形態に応じて合理的な修繕方法の選定を可能とするための基盤技術整備に寄与し,電力インフラの耐災害性向上と損傷後の迅速な復旧を行うための技術開発に貢献しうるものである.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (10 results)

All 2021 2020 Other

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (4 results) Remarks (3 results)

  • [Journal Article] Anisotropic subloading surface Cam-clay plasticity model with rotational hardening: Deformation gradient-based formulation for finite strain2021

    • Author(s)
      Yuki Yamakawa, Koichi Hashiguchi, Tomohiro Sasaki, Masaki Higuchi, Kiyoshi Sato, Tadashi Kawai, Tomohiro Machishima, Takuya Iguchi
    • Journal Title

      International Journal for Numerical and Analytical Methods in Geomechanics

      Volume: 45 (16) Issue: 16 Pages: 2321-2370

    • DOI

      10.1002/nag.3268

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Elaborated subloading surface model for accurate description of cyclic mobility in granular materials2021

    • Author(s)
      Koichi Hashiguchi, Tatsuya Mase, Yuki Yamakawa
    • Journal Title

      Acta Geotechnica

      Volume: - Issue: 3 Pages: 699-719

    • DOI

      10.1007/s11440-021-01203-y

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] FULLY IMPLICIT STRESS-UPDATE ALGORITHM FOR EXTENDED SUBLOADING SURFACE MODEL INCORPORATING NONHARDENING STRAIN REGION2020

    • Author(s)
      井口拓哉, 佐藤大貴, 羅家か, 山川優樹
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))

      Volume: 76 Issue: 2 Pages: I_193-I_204

    • DOI

      10.2208/jscejam.76.2_I_193

    • NAID

      130007980156

    • ISSN
      2185-4661
    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] 損傷を受けた送電鉄塔の修繕シミュレーション:損傷要因に応じた修繕方法と強度回復程度の評価2021

    • Author(s)
      立崎理久, 山川優樹, 溝江弘樹, 室井亮
    • Organizer
      令和2年度土木学会東北支部技術研究発表会
    • Related Report
      2020 Research-status Report
  • [Presentation] Deformation-gradient-based formulation of Cam-clay plasticity model with anisotropic rotational hardening and subloading surface concept2021

    • Author(s)
      Yuki Yamakawa, Takuya Iguchi, Jiahua Luo
    • Organizer
      14th WCCM & ECCOMAS 2020
    • Related Report
      2020 Research-status Report
  • [Presentation] 非硬化塑性ひずみ領域を導入した拡張下負荷面モデルの完全陰的応力計算法の開発2020

    • Author(s)
      井口拓哉, 佐藤大貴, 羅家か, 山川優樹
    • Organizer
      第23回応用力学シンポジウム
    • Related Report
      2020 Research-status Report
  • [Presentation] 送電鉄塔の強風や基礎不同変位による部材損傷と修繕による耐荷力の回復程度の評価2020

    • Author(s)
      立崎理久, 山川優樹
    • Organizer
      令和元年度土木学会東北支部技術研究発表会
    • Related Report
      2019 Research-status Report
  • [Remarks] researchmap

    • URL

      https://researchmap.jp/read0122059

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
  • [Remarks] 東北大学 大学院工学研究科 土木工学専攻 数理システム設計学研究室

    • URL

      http://msd.civil.tohoku.ac.jp/

    • Related Report
      2021 Annual Research Report 2019 Research-status Report
  • [Remarks] 東北大学 大学院工学研究科 土木工学専攻 数理システム設計学研究室(スタッフ:山川優樹)

    • URL

      http://msd.civil.tohoku.ac.jp/staff_yamakawa.html

    • Related Report
      2020 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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