Hiroyuki Omura,
Numerical
Investigation
TakuzoOnYamashita
Collapseand
Mechanisms
Daigoro Isobeof Suspended Ceilings in Wide-Area Facilities
14th World Congress in Computational Mechanics (WCCM)
ECCOMAS Congress 2020
19 – 24 July 2020, Paris, France

Numerical Investigation on Collapse Mechanisms of Suspended Ceilings in
Wide-Area Facilities
Hiroyuki Omura1*, Takuzo Yamashita2 and Daigoro Isobe3
University of Tsukuba, 1-1-1 Tennodai, Tsukuba-shi, Ibaraki 305-8573, Japan,s1820884@s.tsukuba.ac.jp
2National Research Institute for Earth Science and Disaster Resilience, 3-1 Tennodai, Tsukuba-shi,
Ibaraki 305-0006, Japan, tyamashi@bosai.go.jp
3
University of Tsukuba, 1-1-1 Tennodai, Tsukuba-shi, Ibaraki 305-8573, Japan,
isobe@kz.tsukuba.ac.jp, http://www.kz.tsukuba.ac.jp/~isobe/
1

Key Words: Suspended Ceilings, Collapse analysis, ASI-Gauss Code, FEM.
In Japan, there have been many reports of damages caused to suspended ceilings of wide-areafacilities during high-intensity earthquakes. In response to these events, the collapse behaviors
of suspended ceilings were investigated through the experiment conducted at the E-Defense
shaking table facility [1]. However, it is costly to investigate collapse behaviors of ceilings,
which have various specifications dependent to their aim of use.
In this study, a numerical code that can simulate ceiling collapse phenomena in wide-areafacility under seismic excitation was developed based on the Adaptively Shifted Integration(ASI) - Gauss code [2][3][4]. A numerical model of a suspended ceiling was validated by thereproduction analysis of the experiment conducted at the E-Defense. Then, numerical analyseson the behaviors of earthquake-resistant ceilings in the gymnasium were conducted.
Furthermore, a collapse behavior of the suspended ceilings that is complex in structure and canbe attached to a concert hall were investigated by a simulation.
According to the numerical results, the acceleration and displacement responses of thenumerical model agreed well with the experimental results. In addition, a detailed mechanismof the ceiling collapse was obtained. The analyses of earthquake-resistant ceilings showed howeach major anti-earthquake measures affect and reduce the damages of suspended ceilings.
Finally, it was shown how the shape of ceiling surface affect the collapse behavior of suspendedceilings with complex structure in the simulation of a concert hall.
REFERENCES[1] T. Sasaki et al., Collapse Mechanism of Wide-Area Suspended Ceiling System Based on

E-Defense Full-Scale Shake Table Experiments, Shake Table Experiments on NonSeismic Suspended Ceiling and Seismically Designed Suspended Ceiling, 2015 (inJapanese).
[2] D. Isobe, L. T. T. Thanh and Z. Sasaki, Numerical Simulations on the Collapse Behaviors
of High-Rise Towers, Int. J. Protective Structures, Vol. 3, No. 1, pp.1-19, 2012.
[3] D. Isobe, W.S. Han and T. Miyamura, Verification and Validation of a Seismic ResponseAnalysis Code for Framed Structures using the ASI-Gauss Technique, Earthquake
Engineering and Structural Dynamics, Vol. 42, No. 12, pp.1767-1784, 2013.
[4] D. Isobe, Progressive Collapse Analysis of Structures: Numerical Codes and Applications,Elsevier, 2017.

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