| 種別 | paper |
| 主題 | Buckling Load and Ductility of Unbonded Braces Restrained by Reinforced Concrete with F.R.P. |
| 副題 | |
| 筆頭著者 | TAKAHASHI Shunran（Space Design） |
| 連名者1 | YOSHIDA Keito（Musashi Institute of Technology） |
| 連名者2 | ANDO Nobuyoshi（Musashi Institute of Technology） |
| 連名者3 | |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 14 |
| 号 | 2 |
| 先頭ページ | 1005 |
| 末尾ページ | 1010 |
| 年度 | 1992 |
| 要旨 | Introduction The authors have proposed new steel braces in framed structures which effectively resist compressive loads. The new braces called unbonded braces (thereafter, referred to as U.B.), are restrained by reinforced concrete to enhance buckling load up to almost the yield strength of the steel braces without the change of their rigidity by providing insulations between steel braces and reinforced concrete covers. The behavior of U.B. was analyzed and the results were verified through a series of experiments. Furthermore, the U.B. are developed with fiber glass reinforced plastic (thereafter, refered to as U.B.F.) to enhance buckling load and ductility. The objective of this paper is to investigate the failure mechanism, yield strength and deflection of the U.B. and ductility of U.B.F. Conclusions The results obtained in this paper have led to the following conclusions: 1) The new equation for obtaining buckling load of unbonded braces is proposed. The equation is conducted by taking the secondary stresses effects into account.2) It is possible to consider the effect of reinforcement bars in the reinforced concrete cover to the buckling load but it is not the main factor to enhance the buckling load in the reinforcement ratio range from 0 to 1%。 The main factors are thickness of reinforced cover, the initial crookedness of the steel brace and the strength of concrete.3) The buckling load also depends on initial crookedness. Larger value of initial crookedness causes lower buckling load. The effect is remarkable for the thinner reinforced concrete cover U.B.4) The one-half length of F.R.P. does not enhance effectively the buckling load but is one of the factors to contribute to ductility.5) The reinforcement ratio influences the ductility of U.B. |
| PDFファイル名 | 014-01-2174.pdf |