Effect of frequency of loading on vibration isolation efficiency of geocell reinforced beds

Venkateswarlu, H and Hegde, A (2023) Effect of frequency of loading on vibration isolation efficiency of geocell reinforced beds. In: Sadhana - Academy Proceedings in Engineering Sciences, 48 (3).

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Abstract

One of the most governing factors in the design of the foundation supporting the vibration sources is to reduce the amplitude of vibration. Vibration generated from industrial machinery is frequency dependant, and frequency has a significant influence on these design factors. Therefore, this manuscript describes the influence of frequency of loading on the vibration mitigation efficacy and the behaviour of geocell reinforced bed using the experimental and numerical studies. As part of the experimental study, a series of field vibration tests have been performed over the unreinforced and geocell-reinforced soil beds by varying the frequency of loading between 15 and 45 Hz. Using field tests, different vibration isolation parameters namely, velocity reduction ratio (VRR), vibration mitigation efficiency and attenuation coefficient have been studied. Numerical analysis has been conducted using FLAC3D to demonstrate the variation of VRR with respect to some of the key parameters namely, footing shape, geocell area, and relative density of infill. From the experimental results, vibration mitigation efficiency of geocell reinforced beds corresponding to distinct frequencies of loading i.e., 15 Hz, 25 Hz, and 45 Hz was observed as 39%, 43%, and 49%, respectively. The attenuation coefficient of a geocell reinforced bed was found to increase with the increase in frequency. Use of geocell reinforcement, notably minimized the strain generated over the foundation bed. However, the strain corresponding to the unreinforced and geocell-reinforced beds was increased with the increase in frequency of loading. VRR was found to decrease with the increase in geocell area and relative density of the infill material.

Item Type:	Journal Article
Publication:	Sadhana - Academy Proceedings in Engineering Sciences
Publisher:	Springer
Additional Information:	The copyright for this article belongs to Springer.
Keywords:	footing shape; frequency; Geocell; relative density of infill; shear strain; velocity reduction ratio.
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	26 Jul 2023 07:08
Last Modified:	26 Jul 2023 07:08
URI:	https://eprints.iisc.ac.in/id/eprint/82559

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