IMPROVEMENT OF SUSPENDED CEILING COLLAPSE SIMULATION AND NUMERICAL INVESTIGATION ON THE COLLAPSE MECHANISM

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  • 吊り天井脱落挙動解析技術の高精度化および脱落メカニズムの数値解析的検証
  • ツリ テンジョウ ダツラク キョドウ カイセキ ギジュツ ノ コウセイドカ オヨビ ダツラク メカニズム ノ スウチ カイセキテキ ケンショウ

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Abstract

<p> In the 2011 Great East Japan Earthquake, cases had been reported in which gymnasiums did not satisfy this function as refuge bases owing to fallen ceilings and lightings. Therefore, measures to prevent ceilings from falling must be considered; in order to achieve that, it is necessary, first, to understand the collapse mechanisms of the ceilings. Therefore, at the E-Defense shaking table facility in 2014, vibration experiments were conducted on a full-scale gymnasium specimen with suspended ceilings. The experiments were conducted on non-resistant and earthquake-resistant ceilings, and the useful knowledge were obtained on the mechanism of ceiling collapse. In addition, Isobe et al. developed the numerical code that can simulate ceiling collapse phenomena under seismic excitation based on the adaptively shifted integration (ASI)-Gauss technique. However, the code has a problem that reproducibility of the collapsed ceiling area is not enough.</p><p> In this study, accuracy of the numerical code was improved by introducing the eccentricity of hanger into the suspended ceiling model and improving detachment conditions of joint metal. In addition, the seismic excitation experiment of the gymnasium with suspended ceilings was reproduced using the code in order to validate the numerical model. Furthermore, the ceiling collapse mechanism of suspended ceilings was discussed in more detail from the numerical results.</p><p> According to the numerical results, the acceleration and displacement response of the numerical model agreed well with the experimental results. Furthermore, the ceilings collapsed near the roof top as in the experiment. That is, the ceiling collapse phenomena were simulated with higher accuracy by improving the numerical model and detachment conditions. In addition, the ceiling collapse mechanism, which had not been obtained by the experiments, was revealed through the numerical examination. Additional forces exerted on the joint metals due to the buckling of suspended bolts and the vertical vibration of the ceilings caused by the eccentricity of hanger. As a result, the ceilings were damaged intensively near the roof top.</p>

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