Seismic Performance-Based Design and Analysis of a Large Cantilevered High-Rise Building Structure

This study focuses on a large cantilevered high-rise structure with a height of 26.2 m， which adopts a frame-shear wall structural system. The structure exhibits three out-of-code irregularities， including torsional irregularity， discontinuous floors， and component interruption. Specific seismic performance objectives and strengthening measures were established for these irregularities. The structure was analyzed using YJK， MIDAS Building， and SAUSAGE software， conducting elastic analysis under frequent earthquakes and wind loads， equivalent elastic analysis under fortification and rare earthquakes， as well as elasto-plastic time-history analysis under rare earthquakes. Structural analyses were performed to address key irregular features， such as discontinuous floor slabs， and discontinuous members. These included stress analysis of floor slabs， performance evaluation of cantilevered skip-floor trusses， and buckling analysis of cross-story columns， supplemented with a floor comfort assessment. The calculation results demonstrates that， with appropriate strengthening measures， all structural indicators met the code requirements and achieve the predefined seismic performance objectives. The design methodology and measures adopted can serve as a reference for similar projects. The design methods and strengthening measures employed can serve as a reference for similar projects.