Safety Evaluation of a Tall Buildingby R. Y. Tan, Natl Taiwan Univ, Taiwan,
G. S. Wang, Natl Taiwan Univ, Taiwan,
Abstract: This paper uses the extended Kalman filter to perform the system identification of a tall building with the aid of recorded accelerograms obtained from strong-motion seismographs. The building is a 28-story steel frame structure. Available data are due to the occurrence of earthquakes of May 20 and November 15, 1986, with PGA being 45 gal and 49 gal, respectively. Maximum accelerations on the top of buildings are 103 gal and 140 gal. As a preliminary study, a linear model is assumed. Through spectral analysis, estimation of frequencies is made and these serve as initial values for the identification process. Damping ratios, structural frequencies and participation factors will be obtained on the basis of one-component and multiple-component excitations.
Subject Headings: Earthquake resistant structures | Structural safety | Steel frames | Steel structures | Earthquakes | Model analysis | Dynamic structural analysis | System analysis
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