ASI-Gauss法を用いた体育館天井の落下解析

Collapse Analysis of Gymnasium Ceiling Using ASI-Gauss Technique

Abstract

東北地方太平洋沖地震において体育館の天井が損傷・落下する被害が多く報告された．天井が落下した場合，人命が脅かされるうえ，建物の機能が著しく低下する．そのため，避難施設となる体育館の天井落下現象を検討することは急務である．本研究では天井落下現象のメカニズムを解明するために，ASI-Gauss法を用いた地震動下の体育館における天井落下解析を実施した．

Many accidents of ceiling collapse were observed in the 2011 Great East Japan earthquake and others in Japan. In this paper, a numerical seismic simulation of ceiling collapse in the full-scale gymnasium specimen is conducted. Numerical model consists of steel structural frames and suspended ceiling. All members are modeled by the linear Timoshenko beam elements. The ASI-Gauss technique, which is utilized to shift the numerical integration point adaptively to an appropriate position, is applied to the nonlinear finite element procedure for structurally discontinuous problems. Numerical seismic simulation shows that ceiling collapse progresses due to the detachment of clips attaching ceiling joist to ceiling joist receiver and finally results in falling-down of ceiling.