Seismic evaluation of a four-story apartment building in Matina, Davao City using non-linear dynamic analysis in accordance with ASCE 41-17

Civil Engineering Program, College of Engineering Education, University of Mindanao, Davao City 8000, Philippines

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Abstract

The increasing frequency and intensity of seismic activity in the Philippines posed significant challenges to ensuring urban buildings' safety and structural integrity. This study focused on evaluating the seismic performance of a mid-rise apartment building through nonlinear dynamic analysis, following the guidelines set by the American Society of Civil Engineers (ASCE) 41-17 and the National Structural Code of the Philippines (NSCP) 2015, utilizing ETABS software. Earthquake records from the Pacific Earthquake Engineering Research Center (PEER) database, specifically those exhibiting seismic behavior similar to Davao's, were used to simulate ground motions and determine maximum base shear and displacement. The initial analysis results failed to meet the Life Safety performance level criteria, prompting retrofitting measures. After retrofitting, the base shear increased by 15 times along the x-axis and three times along the y-axis. Additionally, displacement decreased by 92.96% in the x-axis and 81.55% in the y-axis, indicating enhanced structural stiffness and resistance to seismic forces. These results confirmed a substantial improvement in the building's resilience to local earthquake impacts.