地震作用下浮放物体运动状态研究

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摘要为了研究地震作用下浮放物体的运动状态，将浮放物体简化为木制块体，共设计了9个试件，围绕可能发生的滑移、滑移-摇摆以及摇摆（倾覆）三种运动状态，考虑宽高比、地震波的卓越频率、体型大小、形状以及质心高度等因素的影响，采用振动台试验和数值模拟相结合的研究方法，对浮放物体的运动状态进行了系统性的研究。结果表明：浮放物体的宽高比不同时，宽高比越大，试件越稳定，而宽高比相同时，长方体试件比圆柱体试件更稳定；浮放物体的运动响应随地震波卓越频率的增大而减弱；体型的变化对浮放物体的滑移量无影响，摇摆角随体型的增大而减小；降低质心高度能够增加浮放物体的稳定性，可有效保护浮放物体；有限元模拟与试验拟合较好，可有效模拟浮放物体在水平地震作用下的滑移、滑移-摇摆以及摇摆（倾覆）响应。

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	杨维国1
	胡卫中1
	齐涛1
	刘佩1
	王萌1
	葛家琪2

关键词 ：浮放物体, 振动台试验, 运动状态, 有限元分析, 刚性块体

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

收稿日期: 2020-06-16 出版日期: 2021-12-15

引用本文:

杨维国1，胡卫中1，齐涛1，刘佩1，王萌1，葛家琪2. 地震作用下浮放物体运动状态研究[J]. 振动与冲击, 2021, 40(23): 247-253.
YANG Weiguo1, HU Weizhong1, QI Tao1, LIU Pei1, WANG Meng1, GE Jiaqi2. Motion state of floating object under earthquake. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(23): 247-253.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I23/247

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