| 種別 | Paper |
| 主題 | A STUDY OF ULTIMATE STRENGTH OF REINFORCEMENT CONCRETE CORNER CONNECTION JOINTS SUBJECTED TO NEGATIVE MOMENT |
| 副題 | |
| 筆頭著者 | Virach RUNGROJSARATIS |
| 連名者1 | Tamon UEDA |
| 連名者2 | |
| 連名者3 | |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 9 |
| 号 | 2 |
| 先頭ページ | 687 |
| 末尾ページ | 692 |
| 年度 | 1987 |
| 要旨 | 1.INTRODUCTION In the design practice for reinforced concrete corner connection joints, it is desirable to avoid failure in the corner connection joints. Although there is the consensus for the corner connection joint subjected to negative moment (moment tends to close the corner) that all common reasonable reinforcing details give an acceptable performance (2), care for detailing such as bend radius of reinforcement should not be overlooked when high percentage of reinforcement is considered. Kemp et al's experiment (1) also showed that the premature splitting failure in the corner connection joint might occur as percentage of reinforcement was increased. To avoid splitting failure, Kemp had proposed equation for limiting steel content. From Balint et al's tests (3), it was found that other than to limit the flexural steel content, to provide a sufficient size of bend radius of reinforcement in corner connection joint can prevent splitting failure of the corner. Current code provisions of either ACI (5) or JSDE (6) specify the limited bend radius of reinforcement in the function of bar diameter for preventing detrimental crushing of concrete inside the bend. The provisions seem to be inconsistent. For instance, it is easily understood when an extreme case of high strength of reinforcement is used. These provisions may not be able to deter premature failure of the corner. A study of reinforced concrete corner subjected to negative moment was done to provide a better understanding for prescribing an appropriate bend radius of reinforcement in the corner. 4. CONCLUSIONS Based on the test results, the conclusion related to behaviour and strength of corner connection joint under negative moment can be summarized as follows 1. Truss mechanism formed in the corner connection joint and effective concrete strut width depended on corner connection size and depth of compression zone at the inner corner. 2. Both ACI and JSCE code provisions for bend radius of reinforcement in the corner connection joint are not conservative. 3. Increase in the ratio of bend radius of reinforcement to corner connection size and concrete strength can increase ultimate strength of corner connection joint caused by bearing stress failure mode. |
| PDFファイル名 | 009-01-2118.pdf |