Abstract:
Sumatera Island is a very active seismic area in Indonesia, which is crossed by the infamous
Pacific Ring of Fire. The western side of Sumatera Island suffers more from the ground
shaking due to its closer distance to the epicenter. Combined with huge coverage of soft soil,
building structures built on this island may experience excessive deformation and eventually
collapse in a brittle way. For high-rise reinforced concrete (RC) building, the impact is even
more devastating and may endanger its occupants. Due to these facts, this study aims to
analyze the deformation characteristic (story-drift) of high-rise RC building under earthquake
loading in Sumatera Island. Modal response spectrum analysis is performed to compute the
maximum story-drift of three RC building models (10 story, 15 story, and 20 story) used in this
study. The seismic acceleration response spectrum function is derived from the lastest
Indonesia’s Seismic Hazard Map (2010) and SNI 1726-2012. Eight capital cities in Sumatera
Island and three soil conditions (soft, medium, and hard soil) are selected to generate 24
seismic acceleration response spectrum functions. Combined with three RC building model
variations, 72 story-drift data are obtained for each X and Y horizontal direction. Based on the
analysis result, taller buildings in soft soil condition are at greater risk to experience excessive
deformation due to seismic loading. Seismic locations in the western side of Sumatera Island is
also observed to exhibit higher seismic hazard compared to central and eastern side of
Sumatera Island.
