| Title |
Seismic Retrofit of Flat Plate Structures by Post-tensioning and Jacketing of Columns |
| Authors |
Shin Woo-Seung ; Kim Jin-Koo |
| Keywords |
Post-tension ; Tendons ; Flat Plate ; Seismic Retrofit |
| Abstract |
In this study a seismic retrofit scheme for flat plate structures by post-tensioning columns was investigated. The analysis model structure is a 3-story flat plate structure designed only for gravity load. The design parameters of the retrofit scheme were identified through analysis of a single-degree-of-freedom system composed of a column and a mass. As the nonseismic-designed flat plate structures are vulnerable to punching shear failure, the slabs need to be reinforced by steel plates before reinforcing the columns. The seismic performance of the non-seismic designed model structure, obtained by nonlinear static and dynamic analyses, was compared with the performance of the structure after the seismic retrofit. The analysis results showed that the stiffness, strength, and the ductility of the flat plate structure could be enhanced by enforcing post-tension force to columns. The seismic performance of the columns could be further increased by jacketing the columns with FRP sheet or steel plates to provide additional confinement and/or axial strength. |