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research-article

A preliminary experimental study about two-sided impacting SDOF oscillator under harmonic excitation

[+] Author and Article Information
Ugo Andreaus

Sapienza University of Rome, Faculty of Civil and Industrial Engineering, Department of Structural and Geotechnical Engineering Via Eudossiana 18 - 00184 Rome, Italy
ugo.andreaus@uniroma1.it

Paolo Baragatti

Sapienza University of Rome, Faculty of Civil and Industrial Engineering, Department of Structural and Geotechnical Engineering Via Eudossiana 18 - 00184 Rome, Italy
paolo.baragatti@studiobaragatti.eu

Maurizio De Angelis

Sapienza University of Rome, Faculty of Civil and Industrial Engineering, Department of Structural and Geotechnical Engineering Via Eudossiana 18 - 00184 Rome, Italy
maurizio.deangelis@uniroma1.it

Salvatore Perno

Sapienza University of Rome, Faculty of Civil and Industrial Engineering, Department of Structural and Geotechnical Engineering Via Eudossiana 18 - 00184 Rome, Italy
salvatore.perno@uniroma1.it

1Corresponding author.

ASME doi:10.1115/1.4036816 History: Received November 25, 2016; Revised May 04, 2017

Abstract

Seismic isolation can protect delicate equipment housed in structures under earthquake attacks. One of the common approaches to isolate equipments is by using various base isolation systems on which the equipments are mounted. Base isolation requires a gap between the base-isolated equipment and its surroundings to provide space for the deformation of isolation system. During strong earthquakes, structural poundings may occur between the equipment and the surrounding moat wall because of the limited separation distance and the deformations of the isolator. Bumping against the surroundings may change the performance of the base-isolated equipment. A potential mitigation measure for this problem is the incorporation of layers of soft material, which can act as collision bumpers, in order to prevent the sudden impact pulses. Thus, shaking table tests have been carried out to investigate the pounding phenomenon between a mass and two-sided shock absorbers, subject to sinusoidal excitations. To investigate the effectiveness of such an impact mitigation measure, preliminary tests were carried out: first, the dynamic response was recorded without pounding, and secondly the test structure was placed with gap separation and pounding was induced. Absolute acceleration, relative excursion, mean contact force, coefficient of restitution and dissipated energy were recorded at steady state and the excitation frequency range for pounding occurrences were determined. Numerical predictions were made by using a contact model for the simulation of impacts, able to appropriately describe the behavior of rubber under impact loading. Good agreement between the experimental and the numerical results was achieved.

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