Exploring building vibration dynamics in the wake of the Chi-Chi earthquake: implications for natural hazard preparedness

This study delves into the critical realm of natural hazard preparedness by examining building vibrations after Taiwan’s Chi-Chi earthquake (1999). By meticulously analyzing the monitored displacement of a building pre- and post-catastrophe, we unveil a notable correlation between the building's proximity to the hypocenter and subsequent changes in period and damping as earthquake magnitudes escalate. Based on these insights, we have devised a robust regression model to accurately estimate optimal periods using peak ground acceleration values. Our research provides a pragmatic assessment of a building’s innate vibration characteristics, crucial for long-term seismic monitoring, with a focus on an attic-basement system. The findings offer a fresh perspective on how buildings respond to catastrophic earthquakes, shedding light on their resilience. Moreover, this study demonstrates the feasibility and practicality of evaluating a building's vibration evolution through comprehensive historical strong motion data. Our work provides valuable insights for future maintenance and safety considerations, ensuring steadfast structural integrity in the face of natural hazards.