Experimental Investigation on Structural Vibrations by a New Shaking Table

2020 ◽  
pp. 819-831 ◽  
Author(s):  
Marco Claudio De Simone ◽  
Domenico Guida
Keyword(s):  
Experimental Investigation ◽  
Shaking Table ◽  
Structural Vibrations

scholarly journals Polymeric Bearings as a new base isolation system suitable for mitigating machine-induced vibrations

2018 ◽  
Vol 211 ◽  
pp. 17001 ◽  
Author(s):  
Tomasz Falborski ◽  
Robert Jankowski
Keyword(s):  
Base Isolation ◽  
Excitation Frequency ◽  
Hysteresis Loops ◽  
Shaking Table ◽  
Damping Properties ◽  
Structural Vibrations ◽  
Isolation System ◽  
Equivalent Damping ◽  
Flexible Polymer ◽  
Base Isolation System

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.

Increasing Damping Ratios in a Tuned Liquid Damper Using Damping Bars

2007 ◽  
Vol 353-358 ◽  
pp. 2652-2655 ◽  
Author(s):  
Ki Pyo You ◽  
Young Moon Kim ◽  
Cheol Min Yang ◽  
Dong Pyo Hong
Keyword(s):  
Passive Control ◽  
Damping Ratio ◽  
Tall Buildings ◽  
Shaking Table ◽  
Water Tank ◽  
Tuned Liquid Damper ◽  
Structural Vibrations ◽  
Existing Structures ◽  
Long Time ◽  
Wind Induced Vibration

Wind-induced vibration of tall buildings have been of interest in engineering for a long time. Wind-induced vibration of a tall building can be most effectively controlled by using passive control devices. The tuned liquid damper(TLD) is kind of a passive mechanical damper, which relies on the sloshing liquid in a rigid tank. TLD has been successfully employed in practical mitigation of undesirable structural vibrations because it has several potential advantages: low costs, easy installation in existing structures, and effectiveness even against small-amplitude vibrations. Shaking table experiments were conducted to investigate the characteristics of the shallow water sloshing motion in a rectangular tank. To increase the damping ratio of the rectangular water tank, triangle sticks were installed at the bottom of water tank. This installation increased the damping ratio by amaximum of 40-70%.

Experimental investigation on the seismic performance of masonry buildings using shaking table testing

2012 ◽  
Vol 11 (4) ◽  
pp. 1157-1190 ◽  
Author(s):  
Paulo B. Lourenço ◽  
Leonardo Avila ◽  
Graça Vasconcelos ◽  
J.Pedro Pedro Alves ◽  
Nuno Mendes ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Seismic Performance ◽  
Shaking Table ◽  
Masonry Buildings ◽  
Shaking Table Testing

scholarly journals Experimental investigation of a small-scaled model for overflow section of a high gravity dam on shaking table

2019 ◽  
Vol 11 (2) ◽  
pp. 168781401982995 ◽  
Author(s):  
Mingming Wang ◽  
Jianyun Chen ◽  
Hai Wei ◽  
Bingyue Song
Keyword(s):  
Experimental Investigation ◽  
Shaking Table ◽  
Gravity Dam ◽  
High Gravity ◽  
Scaled Model

scholarly journals Experimental Assessment of a Skyhook Semiactive Strategy for Seismic Vibration Control of a Steel Structure

2018 ◽  
Vol 2018 ◽  
pp. 1-12
Author(s):  
Nicola Caterino ◽  
Mariacristina Spizzuoco ◽  
Antonio Occhiuzzi ◽  
Antonio Bonati
Keyword(s):  
Continuous Monitoring ◽  
Structural Response ◽  
Steel Structure ◽  
Shaking Table ◽  
Seismic Protection ◽  
Damping Properties ◽  
Shaking Table Tests ◽  
Seismic Vibration ◽  
Structural Vibrations ◽  
Damping Force

Sky-hook damping is one of the most promising techniques for feedback control of structural vibrations. It is based on the idea of connecting the structure to an ideal fixed point of the space through passive dissipative devices. Herein the benefit of semiactive (SA) sky-hook (SH) damping is investigated for seismic protection of a two-storey steel frame via shaking table tests. This kind of SA control is achieved implementing a continuous monitoring of selected structural response parameters and using variable dampers. The damping properties of the latter are changed in real-time so as to make the force provided by the damper match the desired SH damping force as closely as possible. To this aim, two prototype magnetorheological dampers have been installed at the first level of the frame and remotely driven by a SH controller. The effectiveness of the control strategy is measured as response to reduction in terms of floor accelerations and interstory drift in respect to the uncontrolled configuration. Two different calibrations of the SH controller have been tested. The experimental results are deeply discussed in order to identify the optimal one and understand the motivations of its better performance.

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