Conference Paper Collapse Mechanism of Wide-area Suspended Ceiling in School Gymnasium

佐々木, 智大  ,  Sasaki, Tomohiro  ,  青井, 淳  ,  Aoi, Atsushi  ,  梶原, 浩一  ,  Kajiwara, Koichi  ,  田川, 浩之  ,  Tagawa, Hiroyuki  ,  佐藤, 大樹  ,  Sato, Daiki

In the 2011 off the Pacific coast of Tohoku Earthquake, many suspended ceilings and other suspendedequipment fell down due to the lack of their resistance to earthquakes. To mitigate severe damage toceiling system caused by earthquakes, new seismic design code for suspended ceiling system was issuedby the Ministry of Land, Infrastructure, Transportation and Tourism. However, the mechanism why andhow suspended ceiling system falls down during earthquakes has not yet been clarified. In order toclarify the collapse mechanism of wide-area ceiling system and development of its countermeasure, newresearch project was launched and first series of full-scale shake-table experiments of wide-area ceilingsystem in school gymnasium was conducted. Based on experimental results, collapse mechanism of nonseismic ceiling was clarified and it was found that failure mechanism of the seismically designedceiling depends on the ratio of strength of ceiling braces and its metal joints.

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