Post-Earthquake Damage Identification of Tall Building Structures: Experimental Verification

Abstract eng:
While a variety of modal-based damage indices have been proposed in the past two decades, their applicability to seismic damage detection of building structures has scarcely been verified using real measurement data. This paper presents an experimental verification study on vibration-based post-earthquake damage identification of tall building structures. A 1:20 scale model of a 38-story residential building was tested on a shaking table to subject to four levels of earthquake (minor, moderate, strong, and super-strong earthquakes). Accordingly, the structure suffered from trifling, moderate, serious, and complete (nearly collapsed) damage, respectively. After the earthquake excitations at each level, post-earthquake ambient vibration responses of the tested structure were measured by accelerometers deployed at different floors. This experiment makes it possible to verify the applicability of vibration-based identification methods in identifying damage of different severities for the same structure. With the identified modal properties from ambient vibration responses, damage in the structure after experiencing each level of the earthquake attacks is evaluated making use of five modal-based damage indices, respectively. By comparing the identification and observation results, it is concluded that the modal flexibility damage index (MFDI), story damage index (SDI), and approximate story damage index (ASDI) perform well in identifying and localizing the seismic damage of different severities.

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