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Centrifuge modelling of structures with oil dampers under seismic loading

Accepted version
Peer-reviewed

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Type

Article

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Abstract

jats:titleSummary</jats:title>jats:pExperimental research into the seismic performance of buildings with passive oil dampers has so far been restricted to large‐scale testing of frames erected on laboratory shaking tables that ignore the foundation soil below. This simplification of the problem falls short of replicating dynamic soil‐structure interaction that would occur in the field. This paper presents the first experimental attempt at utilising high gravity dynamic centrifuge testing to replicate the response of a damped building at a reduced model scale. The paper compares the dynamic response of two similar two‐degree‐of‐freedom model sway frames, one control (bare) frame and one frame equipped with miniature oil dampers, both structures founded on shallow raft foundations in dry dense sand. The miniature oil dampers successfully mitigate floor accelerations, drifts, and storey shear forces in the damped frame with minor modification to the frame stiffness. For strong, near resonance motions, global rocking of the undamped frame associated with physical uplifting of the foundation from the soil surface and subsequent yielding of sand beneath has led to floor acceleration levels, which are comparable to those obtained in the damped building fitted with miniature oil dampers. Assessment of the instrumentation installed on the miniature oil dampers reveals a viscoelastic damper behaviour with a dependency on stroke magnitude and on velocity.</jats:p>

Description

Keywords

centrifuge test, damped structure, dry sand, oil dampers, soil-structure interaction

Journal Title

Earthquake Engineering and Structural Dynamics

Conference Name

Journal ISSN

0098-8847
1096-9845

Volume Title

49

Publisher

Wiley

Rights

All rights reserved