箱型段差吊り天井が取り付けられた音響施設の地震時挙動解析

Seismic Motion Analysis of Acoustic Facility with Box-Type Suspended Ceilings Containing Level Gaps

Abstract


 音響施設に取り付けられるような,重量が大きく構造が複雑な吊り天井の落下メカニズムを調査し,効率的で有効な耐震化方法を明らかにすることは地震防災において重要な課題であると考えられる.本研究では,コンサートホールに取り付けられているものを想定した,天井面に箱型の段差が設けられた吊り天井(以後,箱型段差吊り天井と記す)を一部分抽出した部分天井モデルを作成し,地震波を入力し有限要素解析を行うことで,地震時における落下挙動メカニズムについて調査を行った.なお,解析手法には,非線形性が強い解析でも安定的に解くことができ,接触および破断も考慮することができるASI-Gauss法を用いた.


A seismic motion of the box-type suspended ceilings with level gaps was simulated in order to study collapse phenomena of complicated suspended ceilings which is often attached to acoustic facilities such as concert halls. The ASI-Gauss technique which can stably simulate non-linear phenomenon such as fracture, contact and contact release was used as a numerical method for this research. The numerical result had shown that the collapse of the box-type ceilings had started owing to the detachment of clips that connected the ceiling joints to the ceiling joint receivers. Furthermore, it was confirmed that the geometric structure of the level gaps may had strongly influenced the disconnecting process of the clips.


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