Evaluasi kinerja seismik gedung bertingkat banyak dengan metode analisis pushover berdasarkan pedoman ATC-40 dan FEMA 356 (Studi kasus: Hotel Oakwood Yogyakarta)

Yogyakarta is one of the regions with a notable history of earthquakes, such as those that occurred in May 2006, August 2004, May 2001, and June 1992. These seismic activities have had significant impacts on society, ranging from loss of life to damage of building infrastructure, thereby highlighting the need for evaluating the performance of structures in resisting earthquakes. This study was conducted on the structure of the Oakwood Hotel Yogyakarta, a 10-story building serving as temporary accommodation, located on A. M. Sangaji Street, Jetis, Yogyakarta. Given its close proximity to residential buildings and public facilities such as Jetis 1 State Elementary School, assessing the building’s seismic performance is crucial to minimize collapse risk and ensure the safety of occupants and nearby residents. The analysis was using the nonlinear static pushover analysis method to approximate seismic loading conditions more realistically. The pushover analysis was performed with the aid of ETABS software to obtain the capacity curve, plastic hinge mechanism, and structural performance level, based on the assessment guidelines provided in ATC-40 and FEMA 356. The pushover analysis output in the form of a capacity curve indicated the performance point values according to ATC-40 as follows: for the X direction, V = 17773.776 kN and δ = 0,126 m, and for the Y direction, V = 21340,786 kN and δ = 0,106 m. Meanwhile, based on FEMA 356, the performance point values were: for the X direction, V = 17716,38 kN and δ = 0,125 m, and for the Y direction, V = 13841,35 kN and δ = 0,031 m. The study results show that the structural capacity level according to ATC-40 is at the Immediate Occupancy level for both X and Y directions, while based on FEMA 356, the structure also falls under the Immediate Occupancy level for both directions. The plastic hinge mechanism in the structure complies with the SCWB (strong column–weak beam) principle, where plastic hinges are formed first in the beam elements.