Mechanical behavior and design method of light-weight and ductile hybrid structure using composite material

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04788
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 23010:Building structures and materials-related
• Research Institution: Toyohashi University of Technology
• Principal Investigator: Matsumoto Yukihiro 豊橋技術科学大学, 次世代半導体・センサ科学研究所, 教授 (00435447)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 複合材料 / 鋼構造 / 補強 / 座屈

Outline of Final Research Achievements

This research targeted the structural steel members having slender shapes. The unbonded strengthening method and its design method using FRP material were proposed. Then, the strengthening effects were confirmed through the axial compression tests using angle steel members. The adopted experimental parameter was the strengthening length and thickness of the FRP restrainer. It was demonstrated that the compression capacity could be calculated by the linear buckling load by the double beam mechanical model, and post-buckling behavior could be estimated by the plastic hinge structural model. This research results will potentially apply as the actual retrofit because the proposed method can easily be used for existing steel structures.

Free Research Field

建設構造工学

Academic Significance and Societal Importance of the Research Achievements

本研究の成果は長尺部材で構成される空間屋根構造や鉄塔等の工作物の補強法として成果の波及効果が期待でき，軽量で強靭な合成構造の実現に向けて意義のある研究成果であると考える。特に，地震被害対策や供用中の外力・使用条件変更などによる荷重増加に容易に対応できる手法であり，実装の期待も高いと考える。また，設計法や力学モデルの提案では，本研究で対象としたＦＲＰ材を用いた補剛法に限らず応用が可能であることから，既存構造物に対する圧縮耐力向上法と設計法に関する各術的発展が期待できると考える。