Structural Performance Evaluation of the Sao Paulo Lospalos Parish Building Using Response Spectrum Analysis Based on Story Drift and Maximum Displacement

Abstract

Southeast Asia, including Timor-Leste, is part of the Pacific Ring of Fire, which is known to be tectonically active. As a result, buildings in this region are highly vulnerable to earthquake loads. Therefore, the planning and evaluation of building structures against seismic forces are critical aspects in ensuring the safety and comfort of building occupants. The method used in this study involves calculations using ETABS software, starting from the modeling of a multi-story building structure, application of loads in accordance with applicable design standards, and response spectrum analysis to evaluate the structural performance under earthquake loading. This research employs dynamic response spectrum analysis, assisted by the ETABS program. The analysis is conducted in accordance with the calculation procedures stipulated in the Indonesian National Standards SNI 03-1726-2019 and SNI 03-2847-2019. The results of the dynamic response analysis based on ATC (Applied Technology Council–40) indicate that the building performance level in both the X and Y directions falls within the Life Safety category. This means that when subjected to an earthquake, the building structure remains safe and does not pose a risk to its occupants. From the displacement calculations due to earthquake loads, the maximum values obtained fromhe response spectrum analysis are 0.03964 m in the X direction and 0.02460 m in the Y direction. The Sao Paulo Lospalos Parish Building satisfies the allowable inter-story drift limits. Furthermore, based on the evaluation of the structural performance level, the maximum total inelastic drift is 0.05897 in the X direction and 0.04821 in the Y direction. Based on these values, the building performance category is classified as Life Safety (LS). In the event of an earthquake, the building does not experience severe damage; however, minor architectural repairs are still required for continued functional use, without affecting the structural performance.