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Each plaster board was modeled separately to consider local contact between plaster boards, which was simulated by modeling the screws slightly apart. Elasto-plastic buckling of braces and hanging bolts were considered by modeling them with eight beam elements each and two hinge elements on both ends. The clips connecting ceiling joists and ceiling joist receivers are small and delicate components that may be detached during repeated excitation. Once there is a local detachment of clips, a change in the load distribution may cause a chain reaction of detachments, which ends in a drop of plaster boards. Furthermore, the detachments of hanging bolts that are connected to the structural members composing the roof, and failure of screws on plaster boards are assumed to be other main causes of the ceiling collapse. The results of some preliminary tests conducted to see the actual strength of these components are implemented in the analysis for criteria. 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  1. 防災科研関係論文

有限要素法を用いた大規模空間吊り天井の脱落被害再現シミュレーション

https://nied-repo.bosai.go.jp/records/5700
https://nied-repo.bosai.go.jp/records/5700
dcc21a74-552a-44ef-a01b-178bd758352f
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 ja
タイトル 有限要素法を用いた大規模空間吊り天井の脱落被害再現シミュレーション
タイトル
言語 en
タイトル Collapse simulation of wide-area suspended ceiling system using finite element method
言語
言語 jpn
著者 磯部大吾郎

× 磯部大吾郎

ja 磯部大吾郎

en Daigoro Isobe

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藤原嵩士

× 藤原嵩士

ja 藤原嵩士

en Takashi Fujiwara

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山下拓三

× 山下拓三

ja 山下拓三

en Takuzo Yamashita

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田川浩之

× 田川浩之

ja 田川浩之

en Hiroyuki Tagawa

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佐々木智大

× 佐々木智大

ja 佐々木智大

en Tomohiro Sasaki

Search repository
抄録
内容記述タイプ Other
内容記述 Many ceiling collapse damages were observed in wide-area structures such as gymnasiums during the 2011 Great East-Japan Earthquake and the 2016 Kumamoto Earthquake. The prevention of ceiling collapse phenomena is an important issue not only to save people's lives, but to keep these facilities to be safely used as shelters after earthquakes. In this paper, a numerical analysis to simulate the ceiling collapse in a full-scale gymnasium specimen, which was tested at the E-Defense shaking table facility in 2014, was conducted. A numerical model consisted of steel structural frames and suspended ceilings were constructed. All the members were modeled using linear Timoshenko beam elements and the adaptively shifted integration (ASI)-Gauss code was applied. Hangers and hanging bolts were modeled in one piece. The plaster boards were assumed as rigid in out of plane direction and only the mass of rock wool boards was considered. Their strength were neglected. Clips and screws were modeled with minute, small elements. Each plaster board was modeled separately to consider local contact between plaster boards, which was simulated by modeling the screws slightly apart. Elasto-plastic buckling of braces and hanging bolts were considered by modeling them with eight beam elements each and two hinge elements on both ends. The clips connecting ceiling joists and ceiling joist receivers are small and delicate components that may be detached during repeated excitation. Once there is a local detachment of clips, a change in the load distribution may cause a chain reaction of detachments, which ends in a drop of plaster boards. Furthermore, the detachments of hanging bolts that are connected to the structural members composing the roof, and failure of screws on plaster boards are assumed to be other main causes of the ceiling collapse. The results of some preliminary tests conducted to see the actual strength of these components are implemented in the analysis for criteria. The numerical result was validated by the experimental result, which was performed at the E-Defense under an input of two continuous K-NET Sendai 50% waves. The acceleration responses, the spectrum and the displacement responses obtained on the roof matched well with the experimental result. According to the results, the plaster boards near walls pattered down occasionally at the first peak of the first wave. These were due to detachment of clips and screws caused by collisions to the walls. Then, the clips near roof top began to get loose due to buckling of hanging bolts caused by vertical excitation, which ends, at the first peak of the second wave, in drop of plaster boards in a wide range. The numerical result had shown the collapse of the ceilings progressed owing to the detachment of clips that connected the ceiling joists to the ceiling joist receivers, which eventually led to a large-scale collapse of the ceilings.
言語 en
書誌情報 ja : 日本建築学会構造系論文集
en : Journal of Structural and Construction Engineering

巻 82, 号 741, p. 1727-1736, 発行日 2017-11-01
出版者
言語 en
出版者 Architectural Institute of Japan
ISSN
収録物識別子タイプ ISSN
収録物識別子 1881-8153
DOI
関連識別子 10.3130/aijs.82.1727
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