Experimental and analytical studies on the response of 1/4-scale models of freestanding laboratory equipment subjected to strong earthquake shaking |
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| Authors: | Dimitrios Konstantinidis Nicos Makris |
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| Institution: | (1) Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan;(2) Department of Civil Engineering, Faculty of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan |
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| Abstract: | This paper investigates the seismic response of freestanding equipment when subjected to strong earthquake motions (2% probability
of being exceeded in 50 years). A two-step approach is followed because the displacement limitations of the shake table do
not permit full-scale experiments. First, shake table tests are conducted on quarter-scale wooden block models of the equipment.
The results are used to validate the commercially available dynamic simulation software Working Model 2D. Working Model is then used to compute the response of the full-scale freestanding equipment when subjected to strong, 2%
in 50 years hazard motions. The response is dominated by sliding, with sliding displacements reaching up to 70 cm. A physically
motivated dimensionless intensity measure and the associated engineering demand parameter are identified with the help of
dimensional analysis, and the results of the numerical simulations are used to obtain a relationship between the two that
leads to ready-to-use fragility curves. |
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