Post-Earthquake Integrity Assessment of Multi-Story Buildings Using Layered Continuous Modeling with Seismic Recordings

الملخص

Traditionally, structural health monitoring algorithms are carried out by detecting changes in vibrational-based features related to global physical structure properties, which are not appropriate to identify minor and local changes along the structure height induced after earthquake events. Alternatively, exploring propagation features of seismic waves at designated levels at different time-windows during seismic excitation is potentially more sensitive to local changes.  The damage-based wave signature indices are identified as the time elapse of waves traveling from one location to the other, resonance for waves propagating between damaged zones and building top, and change of wave amplitudes. This paper introduces a viable and efficient wave-based approach for assessing structural integrity condition by analyzing seismic response of the Millikan library building located in Pasadena, California due to the Yorba Linda earthquake of 2002. In particular, a hybrid model is first created for seismic wave motion in multistory buildings with unique structural features such as isolated massive floors and continuous inter-story columns/walls. The paper then explores the wave signature with the hybrid model that is sensitive to seismic damage and/or other aging/deterioration-related structural deficiency.