System Identification Applied to Pseudo-Dynamic Test Data: A Treatment of Experimental Errorsby James L. Beck, California Inst of Technology, Pasadena, CA, USA,
Paramsothy Jayakumar, California Inst of Technology, Pasadena, CA, USA,
Abstract: A single-input single-output system identification technique, used to estimate the modal properties of a full-scale six-story steel structure tested within its elastic range by the pseudo-dynamic testing method, revealed negative damping for the third mode. This was attributed to the cumulative effect of feedback of experimental errors. In this paper, it is shown that the effect of feedback errors may be accounted for when estimating the modal parameters. By using the control errors, in addition to the ground motion, as inputs to a multiple-input multiple-output system identification technique, the equivalent viscous dampings for energy dissipated by the structure and for the apparent damping from the feedback errors are estimated.
Subject Headings: Errors (statistics) | Damping | Steel structures | Parameters (statistics) | Ground motion | Field tests | Dynamic tests | Structural behavior
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