American Society of Civil Engineers


Physical-Parameter Identification of Base-Isolated Buildings Using Backbone Curves


by Ming-Chih Huang, (corresponding author), (Assistant Professor, Dept. of Aircraft Engineering, Air Force Institute of Technology, Gangshan, 820 Taiwan, Republic of China; mailing address: Jyulun Rd., Gangshan Township, Kaoshiung County, 820 Taiwan, Republic of China E-mail: sander.huang@msa.hinet.net), Yen-Po Wang, (Professor, Dept. of Civil Engineering, National Chiao Tung Univ., Hsinchu, 300 Taiwan, Republic of China.), Jer-Rong Chang, (Associate Professor, Dept. of Aircraft Engineering, Air Force Institute of Technology, Gangshan, 820 Taiwan, Republic of China.), and Yi-Hsuan Chen, (Graduate student, Dept. of Civil Engineering, National Chiao Tung Univ., Hsinchu, 300 Taiwan, Republic of China.)

Journal of Structural Engineering, Vol. 135, No. 9, September 2009, pp. 1107-1114, (doi:  http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000047)

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Document type: Journal Paper
Section Heading: Structural Identification
Abstract: In this paper, a simplified system identification procedure is developed to investigate the dynamic characteristics of base-isolated buildings equipped with lead-rubber bearings (LRBs). The multistory superstructure is assumed to be linear on the account of substantial reduction in seismic forces due to the installation of LRBs for which a bilinear hysteretic model is considered. The hysteretic model is in turn characterized by a backbone curve by which the multivalued restoring force is transformed into a single-valued function. With the introduction of backbone curves, the system identification analysis of inelastic structures is simplified to a large extent. The proposed algorithm extracts individually the physical parameters of each floor and the bearing system that are considered useful information in the structural health monitoring. A numerical example is conducted to demonstrate the feasibility of using the proposed technique for physical-parameter identification of partially inelastic based-isolated buildings.


ASCE Subject Headings:
Base isolation
Parameters
Identification
Hysteresis
Curvature
Inelasticity