Development of model structural dampers for dynamic centrifuge testing

Boksmati, Jad I.; Madabhushi, Spg; Thusyanthan, NI

doi:10.1201/9780429438660-46

Cited by 1 publication

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Boksmati et al conducted high‐frequency driving tests on another miniature damper equipped with external accumulators instead of an air‐bladder system. The high‐frequency motion of the piston through the oil was causing cavitation and foaming of the damping fluid as the oil flow through the orifices was unable to match the piston driving speed.…”

Section: Geotechnical Centrifuge Modelingmentioning

confidence: 99%

“…The viscous dampers start to approach viscoelastic behaviour. Notwithstanding this, Boksmati et al showed that the miniature dampers in the centrifuge models were still capable of mitigating seismic floor accelerations at 50 g for small stroke, high‐frequency inputs despite oil foaming. For the purposes of this investigation, H68 hydraulic oil (68 cSt viscosity at 40°C) was chosen as a damping fluid, along with a piston head equipped with two 1.4‐mm‐diameter holes.…”

Section: Geotechnical Centrifuge Modelingmentioning

confidence: 99%

See 1 more Smart Citation

Centrifuge modelling of structures with oil dampers under seismic loading

Boksmati

Madabhushi

2020

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

Summary Experimental 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.

show abstract

Section: Geotechnical Centrifuge Modelingmentioning

confidence: 99%

Section: Geotechnical Centrifuge Modelingmentioning

confidence: 99%