CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Hybrid Time/Frequency Domain Identification of Real Base-Isolated Structure

P. Brewick ; W. M. Elhaddad ; E. A. Johnson ; Thomas Abrahamsson (Institutionen för tillämpad mekanik, Dynamik) ; E. Sato ; T. Sasaki
Dynamics of Civil Structures : Proceedings of the 34th IMAC, A Conference and Exposition on Structural Dynamics 2016 (2191-5644). Vol. 2 (2016), p. 303-311.
[Konferensbidrag, refereegranskat]

This paper presents a case study using hybrid time-and frequency-domain identifications in a synergistic manner to develop models of a full-scale experimental base-isolated structure. This four-story reinforced-concrete building on an isolation layer (of rubber bearings, elastic sliding bearings, passive metallic yielding dampers, and controllable oil dampers) was designed and constructed at the large-scale Japanese NIED E-Defense earthquake engineering laboratory. A variety of sensors, including accelerometers, were mounted within the structure to measure building response to shake table excitations. While the building was ultimately subjected to historical and synthetic ground motions, the recorded table and building accelerations during a number of random excitation tests are used to identify the structure's natural frequencies, damping ratios and mode shapes. The substantial damping provided by the isolation layer necessitates adopting a hybrid time-and frequency-domain approach for identification. The modes of the structure are separated by frequency content wherein lower frequency modes are identified using time domain approaches from the subspace identification family of methods and higher frequency modes are identified using frequency response functions. Individually, neither approach is able to successfully identify all of the desired modes but, through their combination, the modal properties of the structure are successfully characterized.

Nyckelord: Full-scale testing; Base-isolation; State-space models; Frequency response functions; Modal analysis



Denna post skapades 2016-09-16.
CPL Pubid: 241882

 

Läs direkt!


Länk till annan sajt (kan kräva inloggning)


Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Dynamik

Ämnesområden

Maskinteknik

Chalmers infrastruktur