| Title |
Analysis of Seismic Response Control Performance of Outrigger Systems in Tilted Irregular High-Rise Buildings |
| Authors |
김지현(Kim, Ji-Hyeon) ; 이다혜(Lee, Da-Hye) ; 강주원(Kang, Joo-Won) |
| DOI |
https://doi.org/10.5659/JAIK.2025.41.12.311 |
| Keywords |
Tilted Shaped Structure; Outrigger System; Seismic Response; Structural Stability |
| Abstract |
Tilted structural systems, intentionally designed with inclined forms, may experience eccentricity and overturning moments under gravity loads
due to a mismatch between the center of mass and the center of rigidity. Consequently, lateral displacements can be induced not only by
lateral loads but also by gravity loads. Therefore, in structural design, it is essential to examine the member forces and deformations of
critical members under irregular load paths. In this study, the optimal installation locations of outrigger systems in irregular high-rise
buildings with tilted geometries were investigated, and their effectiveness in controlling seismic responses was analyzed. To this end, a set of
90-story analysis models were developed, each with varying in the number and vertical position of inclined stories. Each model was designed
to limit wind-induced lateral displacement to within 1/500 of the building height. Subsequently, the natural period, displacement responses,
and axial forces in external columns and shear walls were analyzed. As a result, the optimal outrigger installation positions in the tilted
structures were located between 0.411H and 0.489H from the top of the building. The displacement response was more effectively reduced
when the core had a larger contact area along the inclined direction. However, as the inclination angle increased and the inclined section was
positioned lower, the effectiveness of controlling axial forces and displacement responses diminished. Although the response-reducing effect of
outrigger installation was observed, the effect was relatively limited. |