Experimental assessment of stiffness and damping in rubber-sand mixtures at various strain levels

Bernal-Sanchez, J and McDougall, J and Barreto, D and Marinelli, A and Dimitriadi, VR and Anbazhagan, P and Miranda, M (2019) Experimental assessment of stiffness and damping in rubber-sand mixtures at various strain levels. In: 7th International Conference on Earthquake Geotechnical Engineering, ICEGE 2019, 17-20 January 2019, Rome; Italy, pp. 1403-1410.

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Abstract

The dynamic properties of shredded rubber-soil mixtures (ShRm), comprising a sub-rounded quartz sand combined with small rubber shreds at 0, 10, 20, 30 by mass, were investigated. Testing ranged from small strain, in resonant column apparatus, to large strain, in cyclic triaxial, all at a frequency of 1 Hz with mean stress equal to 100 kPa. As observed by other workers, the shear stiffness of rubber soil mixtures decreases both (i) with rubber content and (ii) with shear strain. In contrast, increases in damping ratio are smallest at higher rubber contents. Shear modulus reduction behaviour for ShRm are shown to fit well for all percentage rubber contents, the functional form put forward by Darendeli (2001). Damping ratio was well-fitted by Darendeli up to a shear strain of about 0.2, after which the variable trend shown by ShRm has been adjusted using the expression proposed by Phillips & Hashash (2009).

Item Type:	Conference Paper
Publication:	Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions- Proceedings of the 7th International Conference on Earthquake Geotechnical Engineering, 2019
Publisher:	CRC Press/Balkema
Additional Information:	cited By 0; Conference of 7th International Conference on Earthquake Geotechnical Engineering, ICEGE 2019 ; Conference Date: 17 January 2019 Through 20 January 2019; Conference Code:237349
Keywords:	Damping; Earthquakes; Mixtures; Rubber; Shear strain; Stiffness, Dynamic property; Experimental assessment; Functional forms; Modulus reduction; Resonant column apparatus; Shear stiffness; Shredded rubber; Stiffness and damping, Geotechnical engineering
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	18 Nov 2020 09:05
Last Modified:	18 Nov 2020 09:05
URI:	http://eprints.iisc.ac.in/id/eprint/64923

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