Anatomy of the Loma Prieta Earthquake Records of Two Steel Buildings Using MIMO System Identification

by Y. Li, Univ of Houston, Houston, United States,
S. T. Mau, Univ of Houston, Houston, United States,



Document Type: Proceeding Paper

Part of: Engineering Mechanics

Abstract: The Loma Prieta strong-motion records of a 4-story and a 47-story steel building are analyzed using system identification. A time variation study from the 4-story building records reveals a 20% reduction of the first mode frequency in the two principal directions although the building suffered no damage. The source of this reduction is suggested and its implication in response prediction is discussed. From the 47-story building records it is found that the third translational mode in each direction contributes significantly to the story drift. A better method of estimating story drift ratio than the conventional linear interpolation is used to find the drift profile. The orthogonal effect in terms of story drift is also studied.

Subject Headings: Steel structures | Drift (structural) | Earthquakes | Steel | System analysis | Building systems | Damage (structural) | Linear functions

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