Motion state of floating object under earthquake

YANG Weiguo1, HU Weizhong1, QI Tao1, LIU Pei1, WANG Meng1, GE Jiaqi2

Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (23) : 247-253.

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (23) : 247-253.

Motion state of floating object under earthquake

  • YANG Weiguo1, HU Weizhong1, QI Tao1, LIU Pei1, WANG Meng1, GE Jiaqi2
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Abstract

In order to study the motion state of the free standing body under the action of earthquake, the free standing body is simplified to a wooden block, and nine specimens are designed around the three possible motion states of slip, slip-rocking and rocking (overturning). Considering the influence of width-height ratio, predominant frequency of seismic wave, body size, shape and centroid height, the research method of shaking table test and numerical simulation is adopted. The motion state of the free standing body is studied systematically. The results show that when the width-height ratio of the free standing body is different, the greater the width-height ratio is, the more stable the specimen is, but when the width-height ratio is the same, the rectangular specimen is more stable than the cylindrical specimen, and the motion response of the free standing body weakens with the increase of the predominant frequency of seismic waves. The change of body size has no effect on the slip of free standing body, and the rocking angle decreases with the increase of body size. Reducing the height of the centroid can increase the stability of the free standing body and effectively protect the free standing body, and the finite element simulation fits well with the test, which can effectively simulate the sliding, sliding-rocking and rocking (overturning) response of the free standing body under the action of horizontal earthquake.

Key words

 free standing body / shaking table test / motion state / finite element analysis / rigid block

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YANG Weiguo1, HU Weizhong1, QI Tao1, LIU Pei1, WANG Meng1, GE Jiaqi2. Motion state of floating object under earthquake[J]. Journal of Vibration and Shock, 2021, 40(23): 247-253

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