Original Research ARTICLE
Stiffness identification of high-rise buildings based on statistical model-updating approach
- 1Dept of Architecture and Architectural Engineering, Kyoto University, Japan
A system identification problem is investigated for high-rise buildings to identify the story stiffnesses of a shear-bending model (SB model). In the previously proposed stiffness identification method due to the present authors, the shear and bending stiffnesses of the SB model were identified by means of the subspace and inverse-mode methods. The lowest mode of horizontal displacements and floor rotation angles of the objective building was identified first by using measured data of both horizontal and rotational accelerations via the subspace method. Considering the resolution in the measurement of floor rotation angles in lower stories, floor rotation angles in most stories were predicted from the floor rotation angle at the top floor. However, it was difficult to obtain the bending stiffnesses reliably in the previous method. In this paper, to overcome the difficulty in the stiffness identification method using the SB model, a statistical model-updating approach is proposed where the probability distribution of floor rotation angles in the lowest mode is obtained for the identified SB model, and a conditional probability problem is applied by providing additional measured data on floor rotation angle. The proposed stiffness identification method is useful for the structural health monitoring of high-rise buildings. For investigation of the reliability and accuracy of the proposed stiffness identification method, a 10-story building frame subjected to micro-tremor is examined.
Keywords: system identification, Stiffness identification, Model-updating, Shear-bending model, High-rise building
Received: 05 Dec 2017;
Accepted: 02 Feb 2018.
Edited by:Solomon Tesfamariam, University of British Columbia, Canada
Reviewed by:Hossein Mostafaei, FM Global, United States
Emanuele Brunesi, European Centre for Training and Research in Earthquake Engineering, Italy
Copyright: © 2018 Fujita and Takewaki. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Prof. Izuru Takewaki, Kyoto University, Dept of Architecture and Architectural Engineering, Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto, 615-8540, Japan, firstname.lastname@example.org