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Research Article

Prototype silicone rubber based passive seismic damper: Development, characterization and implementation

Utsav Koshtia, Sharadkumar Purohit

Dept. of Civil Eng., School of Engineering, Institute of Technology, Nirma University, Ahmedabad, India

Keywords

Abstract


Silicone rubber;

 Kelvin-Voigt model; 

Benchmark building; 

Passive damper



Passive damping devices are mostly preferred owing to their relatively lower cost, low maintenance, and stability over a wide range of frequencies during seismic events. Currently, these devices with temperature in-sensitive viscoelastic material are being explored. The paper aims to develop a prototype piston-cylinder based passive damper with silicone rubber particles and characterize it with varied amplitude and frequency of sinusoidal input. The device Silicone Rubber Particle Packed Damper, so developed, was then implemented in the benchmark building for seismic response control. Silicone rubber particles with lower hardness were produced through compressed molding technology to improve the damping efficiency of the device. The device was later converted to an Air Damping Device by removing silicone rubber particles for a natural comparison of efficacy. Hysteresis curves of devices, elliptical in shape, obtained through characterization were mathematically modelled using the Kelvin-Voigt model, and parameters were identified using multivariable linear regression to implement them with the benchmark building. Uncontrolled and controlled responses of benchmark building fitted with, both, damping devices were determined under strong motion (El Centro, Hachinohe) and pulse-type (Kobe, Northridge) seismic excitations. Seismic response parameters; peak displacement, peak interstorey drift, peak acceleration, and peak damper force was estimated. Each seismic response parameter yields substantial reduction for controlled benchmark building with Silicone Rubber Particle Packed Damper. The efficacy of damping devices was established by Performance Indices in terms of peak interstorey ratio, level acceleration, base shear, and control force. Though both passive damping devices were found effective in seismic response control of benchmark building, Silicone Rubber Particle Packed Damper outperforms Air Damping Device. The developed prototype damping devices are a low cost and easy to maintain.

© 2024 MIM Research Group. All rights reserved.

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