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JDR Vol.16 No.7 pp. 1074-1085
(2021)
doi: 10.20965/jdr.2021.p1074

Paper:

Changes in the Dynamic Characteristics of a Small-Scale Gymnasium Model Due to Simulated Earthquake Damage

Jun Fujiwara*,†, Akiko Kishida*, Takashi Aoki**, Ryuta Enokida***, and Koichi Kajiwara*

*National Research Institute for Earth Science and Disaster Resilience (NIED)
1501-21 Nishikameya, Mitsuda, Shijimi, Miki, Hyogo 673-0515, Japan

Corresponding author

**National Research Institute for Earth Science and Disaster Resilience (NIED), Ibaraki, Japan

***International Research Institute of Disaster Science (IRIDeS), Tohoku University, Miyagi, Japan

Received:
March 16, 2021
Accepted:
July 14, 2021
Published:
October 1, 2021
Keywords:
large-span structure, shake-table test, damage estimation, simulated damage, small-scale model
Abstract

In this study, the authors used shake-table tests to assess the modal parameters of a small-scale gymnasium model with simulated damage, the feasibility of estimating the damage to large-span building structures was studied. In Japan, large-span structures, such as gymnasiums, are expected to be used as evacuation shelters when a natural disaster occurs. As the shelter itself may be damaged in case of an earthquake, it is critical to determine whether damage has occurred, where it occurred, and how serious it is, before the shelter is used. The small-scale gymnasium was designed based on the similarity rule. Observed earthquake ground motions scaled to aftershock levels were applied to the model. The natural frequencies and mode shapes were obtained from the measured response accelerations. To study the influence of structural damage on the modal parameters, a gymnasium model with simulated damage was also tested. The results indicate that the modal parameters, e.g., natural frequencies and mode shapes, can be obtained from the response accelerations, and the damage patterns can be estimated from the changes in these modal parameters.

Cite this article as:
Jun Fujiwara, Akiko Kishida, Takashi Aoki, Ryuta Enokida, and Koichi Kajiwara, “Changes in the Dynamic Characteristics of a Small-Scale Gymnasium Model Due to Simulated Earthquake Damage,” J. Disaster Res., Vol.16, No.7, pp. 1074-1085, 2021.
Data files:
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Last updated on Oct. 22, 2021