2020 Fiscal Year Final Research Report

New load-deformation model of R/C columns with side walls considering stable behavior after maximum strength

Research Project

PDF

Project/Area Number	17H03340
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Research Field	Building structures/Materials
Research Institution	Niigata University
Principal Investigator	Kato Daisuke 新潟大学, 自然科学系, 教授 (90169508)
Co-Investigator(Kenkyū-buntansha)	中村孝也新潟大学, 自然科学系, 准教授 (50305421) 本多良政小山工業高等専門学校, 建築学科, 教授 (80509919)
Project Period (FY)	2017-04-01 – 2021-03-31
Keywords	鉄筋コンクリート / 袖壁 / 終局変形
Outline of Final Research Achievements	In this study models of lateral load - story drift relationship of RC columns with side walls are proposed which can be used in practical design procedures toward effective use of side walls. Firstly a series of tests on RC columns with side walls have been conducted to investigate the effects of the reinforcement details and the width and length of the side walls on the flexural deformability. The behavior of RC columns with side walls are characterized by two view points, i.e. high strength by contribution of side walls and high deformability after compressive failure of side walls. From this view point, finally in this study, simplified lateral force - story drift angle models for columns with sidewalls are proposed separating sidewall effects from overall behavior. In other word models for side walls and isolated columns are formulated separately. It is noted that the behavior of the overall member can be expressed as the envelope curve of two models.
Free Research Field	建築構造
Academic Significance and Societal Importance of the Research Achievements	本研究の学術的意義は，袖壁が圧壊するときの変形を評価する点，現在十分に理解されていない袖壁圧壊後の挙動を評価する点，である。特に，袖壁付き柱の特徴を捉えたそのモデルの提案は独創的な点と考えている。また，予想される結果は，現行の法律による建物と同じ建物性能で想定外の極限地震に対応する設計が可能になる点である。さらに，将来的には，中小地震に対しての損傷制御性を検討する場合には袖壁を考慮し，大地震や極限地震に対しての安全性を検討する場合には袖壁を無視することにより，建物性能を落とし大地震時の袖壁の損傷を許容する設計も選択可能になると考えている。