EVALUASI STRUKTUR PADA BANGUNAN UTAMA LASKA HOTEL CIATER RESORT DENGAN METODE PUSHOVER ANALYSIS BERDASARKAN ATC-40 DAN FEMA-356

Abstract

Indonesia is located along the Pacific Ring of Fire and is characterized by high seismic activity, including the Subang Regency area. This condition requires building structures, especially public buildings such as hotels, to be designed and evaluated using a performance-based seismic design approach. This study aims to evaluate the structural performance of the Main Building of Laska Hotel Ciater Resort under earthquake loading using nonlinear static analysis (pushover analysis) based on ATC-40 and FEMA-356 criteria. The structural model was developed using SAP2000 v26 software based on shop drawing data. The analyzed structure is a reinforced concrete system subjected to gravity loads according to SNI 1727:2013 and seismic loads based on SNI 1726:2012. Pushover analysis was conducted in both X and Y directions by applying incremental lateral loads until plastic hinges formed, resulting in a capacity curve that describes the relationship between base shear and roof displacement. The results indicate that the structure initially exhibited a linear response, followed by nonlinear behavior after yielding occurred. The performance point determined using the ATC-40 Capacity Spectrum and FEMA-356 Displacement Coefficient methods falls within the Immediate Occupancy (IO) level. Plastic hinge distribution was predominantly observed in beams rather than columns, confirming a strong column–weak beam failure mechanism. Overall, the structure satisfies the seismic performance requirements and demonstrates adequate safety according to applicable standards.