Dynamics of a sliding-rocking block considering impact with an adjacent wall

被引:46
作者
Bao, Yu [1 ]
Konstantinidis, Dimitrios [2 ]
机构
[1] Wuhan Univ Technol, Sch Civil Engn & Architecture, Wuhan, Peoples R China
[2] Univ Calif Berkeley, Dept Civil & Environm Engn, 760 Davis Hall, Berkeley, CA 94720 USA
基金
加拿大自然科学与工程研究理事会;
关键词
rocking; sliding; impact; unilateral contact; overturning; RIGID BODIES; SEISMIC RESPONSE; FRAGILITY; BEHAVIOR; EQUIPMENT; CRITERIA; COLUMNS;
D O I
10.1002/eqe.3250
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
A freestanding rigid block subjected to base excitation can exhibit complicated motion described by five response modes: rest, pure rocking, pure sliding, combined sliding-rocking, and free flight. Previous studies on the dynamics of a rocking block have assumed that the block does not interact with neighboring objects. However, there are many applications in which the block may start or come in contact with an adjacent boundary during its motion, for example, a bookcase or cabinet colliding with a partition wall in an earthquake. This paper investigates the dynamics of a sliding-rocking block considering impact with an adjacent wall. A model is developed in which the base and wall are assumed rigid, and impact is treated using the classical impulse and momentum principle. The model is verified by comparing its predictions in numerical simulations against those of an existing general-purpose rigid-body model in which impact is treated using a viscoelastic impact model. The developed model is used to investigate the effects of different parameters on the stability of a block subjected to analytical pulse excitations. It is found that wall placement (left or right) has a dominant effect on the shape of the overturning acceleration spectra for pulse excitations. In general, decreasing the gap distance, base friction coefficient, and wall coefficient of restitution enhance the stability of the block. Similar observations are made when evaluating the overturning probability of a block using earthquake floor motions.
引用
收藏
页码:498 / 523
页数:26
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