| 種別 | paper |
| 主題 | An Experimental Study on the Strength of a Proposed Bar Joint for Precast Concrete Columns |
| 副題 | |
| 筆頭著者 | Rodolfo YANEZ（Graduate School of Tsukuba University） |
| 連名者1 | Teruaki YAMAGUCHI（Kabuki Corporation） |
| 連名者2 | Kouichi HIBINO（Kabuki Corporation） |
| 連名者3 | Hiroshi IMAI（Tsukuba University） |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 14 |
| 号 | 2 |
| 先頭ページ | 999 |
| 末尾ページ | 1004 |
| 年度 | 1992 |
| 要旨 | INTRODUCTION One of the most important parts in the design of Precast Concrete (PCa) structures is the connection details. Connections between precast members must effectively integrate the individual structural members in full continuity with each other so that the overall building structure behaves monolithically. Hitherto, in the conventional PCa methods, the main bars are placed inside of the PCa members and jointed at the same place where the PCa members are jointed too. This method generated a problem between the construction of precast members and the seismic performance because the main bars are jointed where the stresses due to seismic forces are large. A new concept was proposed by Imai, based on that the main bars are not placed when the precast members are prefabricated and also that the bar joints are located at the middle part of each member, where the stresses due to the seismic forces are small. A test to study the behavior of the main bar-mortar-sheath-lapping bars system, as stated above, was carried out by conducting a pullout test. In this paper, the influences of the height of sheath lug, thickness of cover concrete, lateral reinforcement ratio, lapping length, and loading history are investigated. CONCLUSIONS From the foregoing discussions, the following conclusions can be obtained.1) With the same lapping length, a difference of the lapping joint strength for the top and bottom bars was recognized.2) An improvement in the bond strength was recognized with the increment of the lug height of the sheath.3) No remarkable influence of the cover concrete thickness was recognized.4) As the lateral reinforcement ratio of the bottom bars increases, the strength increases, but in the case of the top bars, an increase in the lateral reinforcement gives a slight decrease and a subsequent increase in the strength.5) The greater the lapping length is the lower the average bond stress at the maximum load. |
| PDFファイル名 | 014-01-2173.pdf |