In the 2011 off the Pacific coast of Tohoku Earthquake, many suspended ceilings and other suspended
equipment fell down due to the lack of their resistance to earthquakes. To mitigate severe damage to
ceiling system caused by earthquakes, new seismic design code for suspended ceiling system was issued
by the Ministry of Land, Infrastructure, Transportation and Tourism. However, the mechanism why and
how suspended ceiling system falls down during earthquakes has not yet been clarified. In order to
clarify the collapse mechanism of wide-area ceiling system and development of its countermeasure, new
research project was launched and first series of full-scale shake-table experiments of wide-area ceiling
system 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 designed
ceiling depends on the ratio of strength of ceiling braces and its metal joints.
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