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  1. 防災科研関係論文

Test and sensitivity analysis of base‐isolated steel frame with low‐friction spherical sliding bearings

https://nied-repo.bosai.go.jp/records/6876
https://nied-repo.bosai.go.jp/records/6876
2bd6fb27-64f6-442c-92cb-dbd1427d6102
Item type researchmap(1)
公開日 2025-04-07
タイトル
言語 en
タイトル Test and sensitivity analysis of base‐isolated steel frame with low‐friction spherical sliding bearings
言語
言語 eng
著者 Motoki Akazawa

× Motoki Akazawa

en Motoki Akazawa

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Masahiro Kurata

× Masahiro Kurata

en Masahiro Kurata

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Shinsuke Yamazaki

× Shinsuke Yamazaki

en Shinsuke Yamazaki

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Yohsuke Kawamata

× Yohsuke Kawamata

en Yohsuke Kawamata

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Shintaro Matsuo

× Shintaro Matsuo

en Shintaro Matsuo

Search repository
抄録
内容記述タイプ Other
内容記述 In Japan, spherical sliding bearings with low friction coefficients are gaining popularity for base-isolating low-rise frames that are relatively lightweight. However, the complete dataset of isolators and a base-isolated frame for evaluating the model sensitivity and response uncertainty are limited. This study first presents the design process, isolation unit- and frame-level testing, and a blind prediction contest conducted on the occasion of full-scale shaking table testing of a three-story base-isolated hospital specimen. The design process utilizes a numerical model that accounts for the velocity and contact pressure dependencies and requires soft- and hard-case simulations with nominal friction coefficients plus and minus standard deviation to consider the uncertainties associated with the bearing behavior. The pre-shipment isolation unit and frame shake table testing yielded an invaluable dataset for bearings under normal and low contact pressures, low and high velocities, and constant and varying axial loads. The accompanying blind prediction contest provided a valuable dataset for rethinking the impact of modeling uncertainty. In-depth data analysis and sensitivity analysis were conducted. The sliding coefficient increased under low-contact pressure and low-velocity conditions. The static friction coefficient was 1.9 to 4.5 times higher than the dynamic coefficient, but this had little impact on the residual displacement, cumulative travel, and maximum story shear force. The axial force fluctuation, vertical motion, and two-directional input did not significantly affect the bearing behavior in the test. The test and the following simulations confirmed that the low friction coefficient helped the building contents, that is, medical equipment in this study, remain in order under near-fault and long-period ground motions.
言語 en
書誌情報 en : Earthquake Engineering & Structural Dynamics

巻 54, 号 1, p. 100-118, 発行日 2025-01
出版者
言語 en
出版者 WILEY
ISSN
収録物識別子タイプ EISSN
収録物識別子 1096-9845
DOI
関連識別子 10.1002/eqe.4249
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