Application of mortar filled double steel tubular members for updating lighting poles of embedded foundation

2020 Fiscal Year Final Research Report

• Project/Area Number: 18K04327
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 22020:Structure engineering and earthquake engineering-related
• Research Institution: Osaka City University
• Principal Investigator: HISAO TSUNOKAKE 大阪市立大学, 大学院工学研究科, 准教授 (90326249)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 照明柱 / 更新 / モルタル充填二重鋼管 / ソケット式接合

Outline of Final Research Achievements

At the lighting poles, the corrosion of the foundation which occurs mainly close to the ground becomes the problem. In this study, Mortar Filled Double Steel Tubular members was focused on as a new update method of implanted basic lighting poles and examined the applicability of connection structure. Experiments of three-point bending tests showed the range which can function surely as composite structure when it has implantation length above a certain level. Moreover, FEM analysis was conducted to examine influence of implantation length, and as a result, the difference of bending load bearing mechanism of this structure became clear.

Free Research Field

コンクリート構造

Academic Significance and Societal Importance of the Research Achievements

本構造のようなコンクリートを充填していない鋼管同士をコンクリートやモルタルなどを介して二重鋼管構造として接合する方法，近年，国内外で検討が行われているが，円形断面の組合せの2重鋼管構造がほとんどである．それに対して，円形のみならず矩形との組み合わせも含めて検討をしており，照明柱以外の構造物の接合に対する研究に対して意義がある．また，維持管理が重要な時代において，簡易的な更新方法を提案することはコスト面のみならず，管理者の選択肢を増やすことになり，有意義な提案となる．