| 種別 | Paper |
| 主題 | ELLIPTICAL STEEL JACKETING OF RECTANGULAR REINFORCED CONCRETE BRIDGE COLUMNS FOR ENHANCED SHEAR STRENGTH |
| 副題 | |
| 筆頭著者 | Yan XIAO（University of California） |
| 連名者1 | M. J. Nigel PRIESTLEY（University of California） |
| 連名者2 | Frieder SEIBLE（University of California） |
| 連名者3 | |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 13 |
| 号 | 2 |
| 先頭ページ | 1027 |
| 末尾ページ | 1032 |
| 年度 | 1991 |
| 要旨 | INTRODUCTION Several recent moderate earthquakes in California have confirmed that column shear failure is a one of the major danger to most existing reinforced concrete bridges designed prior to 1971. This is due to the adopting of the elastic design to permissible stress levels, which typically results in actual flexural strength of columns exceeding their actual shear strength. In order to develop adequate earthquake retrofit measures for bridge columns designed before 1971, an extensive research program has been carried out at the University of California, San Diego. This paper describes the experimental results from one phase of this program, namely the seismic retrofit of short rectangular columns to enhance shear strength through elliptical steel jackets. CONCLUDING REMARKS The poor shear capacity of existing inadequately designed short rectangular reinforced concrete columns can be significantly improved by using an elliptically shaped steel jacket. Based on the philosophy of current capacity design, the retrofit can be done by setting the enhanced shear strength to exceed the new flexural strength. The factor of shear strength over flexural strength for the retrofitted column described in this paper was set to be 3.8, and as a result, a ductile flexural response was obtained. A further reduction of this margin will be considered in future studies. |
| PDFファイル名 | 013-01-2175.pdf |