A substructure shaking table test for reproduction of earthquake responses of high‐rise buildings |
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| Authors: | Xiaodong Ji Kouichi Kajiwara Takuya Nagae Ryuta Enokida Masayoshi Nakashima |
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| Institution: | 1. Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611‐0011, Japan;2. E‐Defense, National Research Institute for Earth Science and Disaster Prevention, Shinjimicho, Miki, Hyogo 673‐0515, Japan |
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| Abstract: | When subjected to long‐period ground motions, high‐rise buildings' upper floors undergo large responses. Furniture and nonstructural components are susceptible to significant damage in such events. This paper proposes a full‐scale substructure shaking table test to reproduce large floor responses of high‐rise buildings. The response at the top floor of a virtual 30‐story building model subjected to a synthesized long‐period ground motion is taken as a target wave for reproduction. Since a shaking table has difficulties in directly reproducing such large responses due to various capacity limitations, a rubber‐and‐mass system is proposed to amplify the table motion. To achieve an accurate reproduction of the floor responses, a control algorithm called the open‐loop inverse dynamics compensation via simulation (IDCS) algorithm is used to generate a special input wave for the shaking table. To implement the IDCS algorithm, the model matching method and the H∞ method are adopted to construct the controller. A numerical example is presented to illustrate the open‐loop IDCS algorithm and compare the performance of different methods of controller design. A series of full‐scale substructure shaking table tests are conducted in E‐Defense to verify the effectiveness of the proposed method and examine the seismic behavior of furniture. The test results demonstrate that the rubber‐and‐mass system is capable of amplifying the table motion by a factor of about 3.5 for the maximum velocity and displacement, and the substructure shaking table test can reproduce the large floor responses for a few minutes. Copyright © 2009 John Wiley & Sons, Ltd. |
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| Keywords: | shaking table test substructure IDCS algorithm model matching method H∞ method high‐rise building |
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