Abstract
The present paper summarizes the preliminary results of the experimental shaking table investigation conducted in order to verify the effectiveness of a new base isolation system consisting of Polymeric Bearings in reducing strong horizontal machine-induced vibrations. Polymeric Bearing considered in the present study is a prototype base isolation system, which was constructed with the use of a specially prepared flexible polymer with improved damping properties. Dynamic oscillatory tests, during which a concrete base slab supported by four Polymeric Bearings was subjected to horizonal sinusoidal excitations characterized by different frequencies and amplitudes, were conducted in order to determine the damping properties of Polymeric Bearings and their effectiveness in mitigating structural vibrations. Equivalent damping ratios for every excitation frequency considered were determined using the experimentally obtained hysteresis loops. Final conclusions are presented and the results discussed.
Highlights
Introduction and motivationVibrations can be triggered by many different factors, such as earthquake-induced ground motions, dynamic crowd loads, or pounding effects
The present paper reports the preliminary results of the experimental shaking table investigation designed to verify the effectiveness of a new base
In order to determine the damping properties of Polymeric Bearings in mitigating structural vibrations, dynamic oscillatory tests, during which a concrete base slab supported by four Polymeric Bearings was subjected to horizonal sinusoidal excitations characterized by different frequencies and amplitudes, were conducted
Summary
Vibrations can be triggered by many different factors, such as earthquake-induced ground motions (see, for example, [1,2]), dynamic crowd loads (see, for example, [3]), or pounding effects (see, for example, [4,5,6,7,8,9]). If there is a need to make an industrial facility remain unfunctional due to any of these potential threats, a non-operating period may cause far-reaching financial consequences. Motivated by this discussion, the present paper reports the preliminary results of the experimental shaking table investigation designed to verify the effectiveness of a new base. In order to determine the damping properties of Polymeric Bearings in mitigating structural vibrations, dynamic oscillatory tests, during which a concrete base slab supported by four Polymeric Bearings was subjected to horizonal sinusoidal excitations characterized by different frequencies and amplitudes, were conducted
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