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Proceedings Paper

System identification of civil engineering structures with multiple inputs by decoupling output signals
Author(s): Jian Li; Manuel Ruiz-Sandoval; Billie F. Spencer; Amr S. Elnashai
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Paper Abstract

System identification of civil engineering structures are often formulated as Multiple-Input, Multiple-Output (MIMO) problems due to the complexity of loading conditions such as differential ground motion, which is also multi-directional in nature. Such MIMO system identification problems are challenging due to strong coupling between the contributions of multiple ground motion inputs to each individual response. Compared with Single-Input, Multiple-Output (SIMO) system identification, MIMO problems are often more computationally complex and error prone. In this paper, a new system identification strategy is proposed in which a more complex MIMO problem is converted into a number of SIMO problems by decoupling the contribution of multiple inputs to the outputs. A QR-factorization based approach is adopted for the decoupling and its accuracy is investigated. The effectiveness of the proposed strategy is demonstrated through applications to a two-span straight bridge and a four-span curved bridge, both are highway bridges.

Paper Details

Date Published: 8 March 2014
PDF: 11 pages
Proc. SPIE 9061, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2014, 90611I (8 March 2014); doi: 10.1117/12.2044191
Show Author Affiliations
Jian Li, The Univ. of Kansas (United States)
Manuel Ruiz-Sandoval, Univ. Autónoma Metropolitana (Mexico)
Billie F. Spencer, Univ. of Illinois at Urbana-Champaign (United States)
Amr S. Elnashai, Univ. of Illinois at Urbana-Champaign (United States)


Published in SPIE Proceedings Vol. 9061:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2014
Jerome P. Lynch; Kon-Well Wang; Hoon Sohn, Editor(s)

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