| 種別 | Paper |
| 主題 | TRANSFER LENGTH OF BRAIDED ARAMID FIBER TEN- DONS |
| 副題 | |
| 筆頭著者 | Antonio. NANNI（The Pennsylvania State University） |
| 連名者1 | Toru UTSUNOMIYA（Mitsui Construction Co.） |
| 連名者2 | Hiroyuki YONEKURA（Mitsui Construction Co.） |
| 連名者3 | Masaharu TANIGAKI（Mitsui Construction Co.） |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 13 |
| 号 | 1 |
| 先頭ページ | 963 |
| 末尾ページ | 968 |
| 年度 | 1991 |
| 要旨 | INTRODUCTION High-strength aramid fiber (AF) can be braided and epoxy-impregnated to produce flexible and rigid rods for use as tendons in prestressed concrete members. These AF rods can replace conventional steel strands or reinforcing bars in applications where light weight, durability, electromagnetic fields, thin sections, and impact resistance are relevant. As a part of a research project intended to evaluate the feasibility of AF flexible tendons in pretensioned prestressed concrete beams, the focus of this paper is on transfer length. Since the force in a pretensioned tendon is transferred to the concrete by bond in the end-region of the member, the determination of the distance within which this transfer occurs (i. e., transfer length) is necessary for both design and performance evaluation. Therefore, the objective of this research was to experimentally determine transfer length of AF tendons as compared to that of uncoated steel strand when varying tendon type, tendon size, tendon number, and concrete strength at time of release. CONCLUSIONS Laboratory determination of tendon transfer length in pretensioned prestressed concrete beams using different tendons was successfully obtained by measuring concrete displacement along the length of the member at the level of the tendon. It was shown that transfer length is affected by: 1) tendon type (adhered-sand AF tendon has shorter transfer length than smooth AF tendon and steel strand): 2) tendon size (AF tendon with larger diameter shows longer transfer length): and 3) concrete strength (the higher the concrete strength the shorter the transfer length). Transfer length of braided epoxy-impregnated aramid fiber tendons is shorter than that of conventional steel strands. This feature can be advantageous in a number of practical applications. The mechanism of load transfer in AF tendons may be substantially affected by tendon surface configuration, adhered-sand, and wedging due to a relatively high Poisson's ratio. Research on transfer length of AF tendons is to be continued to include various prestress levels and large diameter rods. |
| PDFファイル名 | 013-01-1167.pdf |