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12 (2) 2022

Studying the damping characteristics of the system of building and infrastructure considering the Soil-Structure Interaction


Author - Affiliation:
Duong Hong Tham - Ho Chi Minh City Open University, Ho Chi Minh City , Vietnam
Corresponding author: Duong Hong Tham - tham.dh@ou.edu.vn
Submitted: 24-09-2022
Accepted: 24-10-2022
Published: 04-11-2022

Abstract
This paper studies the damping characteristics of the soil foundation under a building concerning the Soil-Structure Interaction (SSI). By considering a multi-story building resting on a piled raft foundation as a typical SSI system, subjected to an earthquake (i.e., Chi Chi earthquake, Taiwan 1999), the time-dependent responses of specified locations in the foundation are recorded and analyzed, both in-time domain and frequency domain. Referring to prior knowledge about system identification and damping, this study suggests an overwhelming approach to determining the damping ratio for analyzing more thoroughly a system of SSI systems. Results are a general procedure to establish the damping matrix, namely the Caughey damping matrix which takes several frequencies into account. A different viewpoint that the connection of superstructure and infrastructure in series could help to estimate the damping, and contribute to a wide range of system identification. All these procedures are used to predict more properly the damping characteristics of a system of structures. Suggestions over the findings would be expected to contribute a more rigorous component to the analysis of high-rise buildings in the future.

Keywords
caughey damping ratios; least square method; measured data; Soil-Structure Interaction (SSI); system identification

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Cite this paper as:

Duong, T. H. (2022). Studying the damping characteristics of the system of building and infrastructure considering the Soil-Structure Interaction. Ho Chi Minh City Open University Journal of Science – Engineering and Technology, 12(2), 99-110. doi:10.46223/HCMCOUJS.tech.en.12.2.2480.2022


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DOI: https://doi.org/10.46223/HCMCOUJS.tech.en.12.2.2480.2022
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