implementation oriented research on residual axial capacity evaluation model for reinforced concrete columns

2018 Fiscal Year Final Research Report

• Project/Area Number: 17K14755
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Building structures/Materials
• Research Institution: The University of Tokyo
• Principal Investigator: Matsukawa Kazuto 東京大学, 生産技術研究所, 助教 (50709186)
• Project Period (FY): 2017-04-01 – 2019-03-31
• Keywords: 鉄筋コンクリート構造 / 柱 / 軸力 / 残存軸耐力

Outline of Final Research Achievements

This research aims to clarify the applicable range (condition) of the arch-resistance model which is a model to estimate the residual axial capacity of shear failed reinforced concrete columns. The outcomes are summarized as follows; (1) The equilibria of both the vertical and horizontal directions at shear failure are key parameters for satisfying the basic assumptions of the model. (2) The applicable range of the arch resistance model is estimated to be transverse reinforcement ratios from 0.2 to 0.45% and an axial force to axial capacity ratio of longitudinal bars of less than 1.0.(3) Even if shear failure occurs after flexural yielding, the arch resistance model well estimated residual axial capacity of column specimens.

Free Research Field

建築構造

Academic Significance and Societal Importance of the Research Achievements

これまでの地震で崩壊した鉄筋コンクリート造建築物のうち少なくない数は，柱のせん断破壊後の軸力保持能力喪失に起因している。こうした被害を防止し，また適切な補強の要否等を判断するために，高精度な軸力保持能力評価モデルが必要であり，研究代表者らが開発してきたアーチ抵抗モデルはそのうちのひとつである。本研究においては，その実用化を目指し，同モデルの適用範囲の検討が行われた。