Comparison of Structural Performance of Fixbase and Base Isolation in KAI Boutique Hotel Building with Response Spectrum

Angga Grecia, Istiqomah Istiqomah, Nanang Dalil Herman

Abstract


This study compares the seismic performance of fixed-base and base-isolated structures for the KAI Boutique Hotel Building in Bandung, a region prone to earthquakes due to active faults such as the Lembang, and Baribis Faults. This study aims to analyze the differences in base shear, displacement, and inter-story drift between the two structural systems using response spectrum analysis, and evaluate the seismic performance level based on ATC-40 guidelines. The research methodology involved modeling an 11-story hotel building in ETABS v.18.1.0 with two scenarios: fixed-base and base- isolated models analyzed by response spectra. The base isolation system uses High Damping Rubber Bearings (HDRB). The main parameters analyzed include base shear, and inter-story deviation. The results show that base isolation significantly reduces base shear. For example, by response spectrum analysis, the base shear is reduced by 54.5% in the X direction and 56.3% in the Y direction compared to the fixed-base system. Base isolation effectively reduced the average inter-storey deviation by 68% in the X direction and 73% in the Y direction. Based on ATC-40, both fixed-base and base-isolated structures achieved the "Immediate Occupancy (IO)" performance level in all analyses, showing minimal structural and non-structural damage, allowing the building to continue functioning after the earthquake


Keywords


Fixbase; Base isolation; HDRB; Response spectrum; base shear; displacement; deviation; ATC-40

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References


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DOI: http://dx.doi.org/10.30811/portal.v17i2.7736

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