Experimental Investigation of the Axial Compression Capacity and Shear Resistance Mechanism of Shear-damaged RC Columns with Emergency Fiber Belt Prestressing Retrofitting
| Project/Area Number |
16K06579
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Building structures/Materials
|
|---|
| Research Institution | University of the Ryukyus |
|---|
Principal Investigator |
NAKADA Kozo 琉球大学, 工学部, 准教授 (80347129)
|
|---|
| Project Period (FY) |
2016-04-01 – 2020-03-31
|
| Project Status |
Completed (Fiscal Year 2019)
|
| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
|
|---|
| Keywords | プレストレス / 横拘束 / 拘束コンクリート / 応急補強 / 軸耐力 / リハビリテーション / せん断破壊 / 復元力 / せん断補強 / 圧縮性能 / 地震防災 |
|---|
| Outline of Final Research Achievements |
This study involves a rehabilitation method (emergency retrofitting) for restoring the axial compression capacity and shear resistance mechanism of shear-damaged reinforced concrete (RC) columns. In this shear-damaged RC columns emergency retrofitting, aramid fiber belts and couplers are employed. Prestressed aramid fiber belts are applied on the damaged RC column, offering active and passive confinement as well as shear strengthening. The results reveal the following: (1) The emergency-retrofitted RC column with high lateral confining pressure exhibits flexural behavior. (2) In the emergency-retrofitted RC column with unbonded rebars, the lateral force capacity and diagonal concrete stress of the arch mechanism increase with rising lateral confining pressure. (3) The emergency retrofitting with high lateral confining pressure causes significant axial compression capacity and compressive ductility recovery.
|
| Academic Significance and Societal Importance of the Research Achievements |
例えば，平成28年熊本地震では大地震が連続発生した。現行の耐震設計は建物が大地震を複数回受けることは想定しておらず，また，近年では地震後に建物を継続使用する要求も高い。地震直後に居住者を一時避難させることなく，また，余震対策のためにも短時間で被災建物に応急補強を施し，建物の安全・居住者の安心を確保することが求められている。本研究では，地震でひび割れが生じた損傷鉄筋コンクリート（RC）柱を高強度緊張材で締め付けてひび割れを「閉合」し，RC柱の軸力支持能力，水平抵抗能力を回復させる。目的を達成するため，水平加力実験と圧縮実験の2種類の構造実験を行い，「ひび割れ閉合」効果を検証した。
|
Report
(5 results)
Research Products
(11 results)
