Fundamental Study on Modeling of Reinforced Concrete Member with Secondary Walls in Non-linear Frame Analysis

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04688
• 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: Matsui Tomoya 豊橋技術科学大学, 工学(系)研究科(研究院), 准教授 (20402662)
• Co-Investigator(Kenkyū-buntansha): 齊藤 大樹 豊橋技術科学大学, 工学(系)研究科(研究院), 教授 (00225715)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 鉄筋コンクリート構造 / 袖壁付き柱 / 静的加力実験 / 復元力特性 / 降伏時剛性低下率 / マルチスプリングモデル

Outline of Final Research Achievements

As a fundamental study for the development of non-linear frame analysis method for RC structures with a secondary-walls, structural characteristics of RC column with wing walls were grasped by the test and the evaluation accuracy of the analytical model of columns with wing walls was examined. From the comparison of experimental results and analytical results, the modeling method using the Sugano formula (method 1) greatly evaluated the deformation at the yield of skeleton curve, and the modeling method using the shear wall model (method 2) was almost in agreement with the experimental result. Method 2 showed a better evaluation than method 1, but depending on the test specimens, the deformation at yield could be overestimated. From the analysis of the previous experiments, it was found that the factor affecting the estimation accuracy of the stiffness reduction factor at yield by the Sugano formula is underestimated as the tensile reinforcing ratio becomes smaller.

Free Research Field

建築耐震構造

Academic Significance and Societal Importance of the Research Achievements

鉄筋コンクリート構造における非構造壁は、地震時に損傷を受けた際、耐力性能の著しい低下につながるものではないが、継続使用の観点からより合理的な設計が望まれる。本研究では、非構造壁が取り付く部材および建物の非線形フレーム解析のモデル化手法におけるモデル化手法の構築に向けた研究であり、耐震壁のモデル化手法に準じた手法で復元力特性を概ね評価できることを示すとともに、菅野式に準じた手法では降伏時の変形を過大評価する要因について明らかにした。今後の復元力特性の評価精度向上に役立つ知見が得られた。