CUED Publications database

Seismic performance of buildings with structural and foundation rocking in centrifuge testing

Pelekis, I and Madabhushi, GSP and DeJong, MJ (2018) Seismic performance of buildings with structural and foundation rocking in centrifuge testing. Earthquake Engineering and Structural Dynamics, 47. pp. 2390-2409. ISSN 0098-8847

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Abstract

© 2018 The Authors Earthquake Engineering & Structural Dynamics Published by John Wiley & Sons Ltd Rocking motion, established in either the superstructure in the form of a 2-point stepping mechanism (structural rocking) or resulting from rotational motion of the foundation on the soil (foundation rocking), is considered an effective, low-cost base isolation technique. This paper unifies for the first time the 2 types of rocking motion under a common experimental campaign, so that on the one hand, structural rocking can be examined under the influence of soil and on the other, foundation rocking can be examined under the influence of a linear elastic superstructure. Two building models, designed to rock above or below their foundation level so that they can reproduce structural and foundation rocking respectively, were tested side by side in a centrifuge. The models were placed on a dry sandbed and subjected to a sequence of earthquake motions. The range of rocking amplitude that is required for base isolation was quantified. Overall, it is shown that the relative density of sand does not influence structural rocking, while for foundation rocking, the change from dense to loose sand can affect the time-frequency response significantly and lead to a more predictable behaviour.

Item Type: Article
Uncontrolled Keywords: structural rocking foundation rocking impact centrifuge testing dry sand Morse Wavelet Transforms
Subjects: UNSPECIFIED
Divisions: Div D > Structures
Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 15 Jun 2018 20:14
Last Modified: 27 Oct 2020 06:58
DOI: 10.1002/eqe.3089