| 種別 | paper |
| 主題 | Local Bond Stress-Slip Relationship of Braided Aramid Fiber Bar Obtained from Pretensioned Bond Test |
| 副題 | |
| 筆頭著者 | Hiroshi Shima（The University of Tokushima） |
| 連名者1 | Tetsuji Suga（Taisei Corporation） |
| 連名者2 | |
| 連名者3 | |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 16 |
| 号 | 2 |
| 先頭ページ | 229 |
| 末尾ページ | 234 |
| 年度 | 1994 |
| 要旨 | 1. INTRODUCTION Continuous fiber reinforcing materials such as braided aramid fiber bar and carbon fiber strand are going to be applied to concrete structures. A design concept of concrete structures reinforced or prestressed with continuous fiber reinforcing materials has already been reported by JSCE committee. However, bond characteristics between the reinforcing materials and concrete have not been clarified yet and research work is necessary to determine anchorage length or to estimate deformations of the structures. In the bond characteristics, a local bond stress-slip relationship is the most basic law for representing interaction between the reinforcing materials and concrete. Although many pullout bond tests of continuous fiber reinforcing materials with short embedded length have been carried out, the local bond stress-slip relationship of these reinforcing materials obtained from bond tests with long embedment may be different from that obtained in the short embedment bond tests, as is the case for deformed steel bars. Furthermore, for prestressing steel strands, it was reported that the bond stress in an anchorage zone of pretensioned prestressed concrete members was larger than that obtained from a pull bond test. Local bond stress-slip relationships of braided aramid fiber bars and carbon fiber strand obtained from pull bond tests with long embedment were reported by the authors. With regard to the bond behavior of continuous fiber reinforcing materials in the anchorage zone of pretensioned prestressed members, Nanni et al. reported the stress transfer length of braided aramid fiber bars. However, the local bond stress-slip relationship of the pretensioned continuous fiber reinforcing material is not known. ln this research, pretensioned bond test with long embedment of braided aramid fiber bar was carried out. From the measurement of strain distribution along the bar during release of the pretension force, the local bond stress-slip relationships were determined. Differences between the local bond stress-slip relationship obtained from the pull test with long embedment and those obtained from the short embedment test or obtained from the pretensioned bond test are discussed. 4. CONCLUSIONS (1) The local bond stress-slip relationship of braided aramid fiber bar varies with test method such as a pretensioned bond test, a pull bond test with long embedment and a pullout test with short embedment. The bond stress obtained from the pretensioned bond test is much larger than that obtained from the pull bond test with long embedment. The bond stress obtained from the pullout test with short embedment is intermediate between these bond stresses. (2) The effect of concrete strength on the local bond stress-slip relationship of braided aramid fiber bar differs with test method. The bond stress at a certain slip increases with concrete strength remarkably in the pretensioned bond test although the effect of concrete strength on the bond stress is little in the pull bond test with long embedment. |
| PDFファイル名 | 016-01-2037.pdf |