音響施設における吊り天井の地震時脱落挙動と耐震化方法に関する数値解析的研究
Abstract
東北地方太平洋沖地震や熊本地震などの巨大地震動に伴って,体育館やホールなどの大スパンを有する建造物において吊り天井が脱落する被害が相次いで報告されている.吊り天井の脱落防止対策を確立するために,実大三次元震動破壊実験施設(以下,E-ディフェンス)にて天井脱落被害再現実験[3]が実施されたり,先行研究において天井脱落挙動の解析技術が開発されたりするなど,吊り天井の脱落メカニズム解明に向けた研究が進められてきている.
In this research, a collapse analysis of a concert hall’s box-type suspended ceiling containing level gaps was performed. A numerical model of the concert hall and ceiling was simulated by applying a seismic wave. The detachment of clips was caused by the propagation of the impact force that was generated when the suspended ceiling collided with the wall. Furthermore, the results showed that the locations of the clips detached by the collisions were strongly affected by the geometrical shape of the ceiling. This phenomenon was also confirmed in the numerical results of the model installed with earthquake-resistant measures.