2005年宮城県沖の地震で天井落下被害の起きた建物の応答解析結果と衝突痕および斜交した下地材に対するクリップ金物の固定度に関する基礎的検討

摘要

2005年の宮城県沖地震で天井落下被害の起きた公共屋内プールを例として、数値解析による天井板と周辺壁面との衝突に関する検討、及び野縁と野縁受けが斜交した施工法に着目した水平線り返し試験を行った。地震時の天井板の挙動は、吊り材の長さが段階的に変化しているため、回転運動の影響で天井板両端部での応答値が大きくなる傾向がある。%The fall of suspended ceilings in a swimming pool during the Miyagiken-oki earthquake in 2005 is still regarded as a special incident, in which the fall occurred very severely and it injured more than thirty people during the rather modest earthquake. In this report a series of numerical dynamic analysis carried out and the results are compared with the results of the real investigations at the site. Further, the arrangements of furring are carefully investigated and discussed in relation to what can be observed from the visual record of a security camera. A series of experiments was also conducted in order to see the effect of non-orthogonality in the furring systems. The results of these experiments are also reported and discussed.