Paradigm Shift in Bond Loss Mechanism of Reinforcement on Structural Performance of PC Members

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K14230
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 22020:Structure engineering and earthquake engineering-related
• Research Institution: Nagoya Institute of Technology
• Principal Investigator: Takeda Kenta 名古屋工業大学, 工学(系)研究科(研究院), 助教 (10804958)
• Project Period (FY): 2021-04-01 – 2023-03-31
• Keywords: 数値解析 / コンクリートの応力－ひずみ関係 / 付着応力－すべり関係 / 要素形状 / 定着長 / プレテンション部材 / 部材の破壊モード / せん断剛性低減係数

Outline of Final Research Achievements

In this study, we focused on prestressed concrete members which bending fracture and shear fracture occur. Then, the effect of the bond loss of PC strands on the structural performance of members were numerical investigated. As a result, it was found that it is necessary to consider the bond stress-slip relationship of PC strands in the analysis when evaluating structural performance including strain of PC strands. In addition, it was shown that structural performance can be evaluated with the same accuracy as when using hexahedral elements, regardless of the fracture mode of members, if tetrahedral elements are used and the number of elements is the same as when using hexahedral elements.

Free Research Field

コンクリート工学

Academic Significance and Societal Importance of the Research Achievements

本研究は，コンクリート部材における構造性能を解析的に検討する際の手法提案を目標とし，PC鋼材の付着や要素形状，コンクリートの材料モデルに主眼を置き，部材の構造性能に及ぼす影響を解析的に検討している．本研究で得られた知見および成果は，実用化されつつある解析的なコンクリート構造物の設計計算や，劣化構造物の残存性能評価を行う際のパラメータ選定に有用と考えられる．