Performance of sand and shredded rubber tire mixture as a natural base isolator for earthquake protection

Bandyopadhyay, Srijit; Sengupta, Aniruddha; Reddy, G. R.

doi:10.1007/s11803-015-0053-y

Cited by 62 publications

(15 citation statements)

References 23 publications

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“…Kaneko et al conducted a pseudo-dynamic (hybrid) test to examine the positive effects of SRM in the seismic isolation of structures and prevent liquefaction [39]. Shaking table tests performed on rigid blocks founded on SRM showed that the structural motion was substantially declined by increasing the SRM layer thickness or the rubber proportion in the mixture [40,41]. Tsiavos et al [42] investigated the sliding response of structures founded on SRM layers with different mean size ratios and thickness, while the sliding interface material was also examined.…”

Section: Introductionmentioning

confidence: 99%

Large‐scale field testing of geotechnical seismic isolation of structures using gravel‐rubber mixtures

Pitilakis

Anastasiadis

Vratsikidis

et al. 2021

Earthq Engng Struct Dyn

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We present the results of a large-scale experimental campaign performed on the prototype structure of EuroProteas in Thessaloniki, Greece, to assess the effectiveness of gravel-rubber mixture (GRM) layers underneath shallow foundations as a means of geotechnical seismic isolation (GSI). We found that the geotechnical seismic isolation of structures is optimized by increasing the rubber content of the soil rubber mixture up to 30% per mixture weight. Although the effectiveness of the GSI systems has been investigated numerically and in small-scale experiments, this paper seeks to fill the gap in the lack of full-scale experimental studies on this subject. Three soil pits were excavated and backfilled with GRM of different rubber content per weight to serve as foundation soil for the structure. A large number of instruments were installed on the structure, the foundation, the soil surface, and inside the gravel-rubber mixture layers beneath the foundation to fully monitor the GSI-structure systems' response in three dimensions. The experimental investigation included ambient noise, free-and forced-vibration tests. Our results showed that a geotechnical seismic isolation layer composed of a gravel-rubber mixture with 30% rubber content per weight effectively isolates the structure. Even 0.5m thickness (i.e., B/6 of the foundation width) of the GSI system is successfully cutting off practically all emitted waves at a (horizontal or vertical) distance of B/6 from the foundation. A significant reduction in the GSI-structure system's stiffness was apparent, leading to a rocking-dominant response. The rise in the system's damping and the substantial energy dissipation inside the GRM layer highlight its effectiveness as a geotechnical seismic isolation system.

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Section: Introductionmentioning

confidence: 99%

Large‐scale field testing of geotechnical seismic isolation of structures using gravel‐rubber mixtures

Pitilakis

Anastasiadis

Vratsikidis

et al. 2021

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

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“…e maximum displacement is closer to four times greater than the 100 gal maximum displacement in the hysteretic curve, which suggests that the stiffness of the specimen degraded or the LRB deformed horizontally in the test [46]. From 620 gal to 1,000 gal, the shape of the hysteretic curve did not markedly change as the work of the LRB was stable [47]. e hysteresis ring area increased when the peak acceleration reached 1,024 gal; the LRB was damaged at this time and the sample reached its limit of seismic resistance.…”

Section: Hysteretic Curvementioning

confidence: 87%

Rural Masonry Isolating Structure and LRB Experiment: Seismic Resistance Properties and Statistical Data Curve Analyses

Zheng

2020

Advances in Materials Science and Engineering

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The low masonry structure is the most commonly applied building type in rural China. It is possible to install small-diameter, low cost, and easily constructed laminated rubber bearing (LRB) components. Isolation technology has broad application prospects in rural buildings. We developed a small-diameter LRB in this study wherein the isolation layer is set above the floor for easy installation and replacement. We built and tested 4 walls to observe the effects of different LRB thicknesses; we assessed test respective phenomena and seismic parameters accordingly. We ran another test on five small-diameter LRB components with varying horizontal stiffness, different forms of shear strain-equivalent horizontal stiffness, and postyield stiffness while changing the fitting formula for the second shape coefficient to give small-diameter LRB design providing gist.

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“…Regarding the content and applicability of the method; it was also underlined that factors such as nonlinear soil behavior, resonance effects of the soil, liquefaction, ground settlement, and environmental effects should be evaluated. In subsequent studies, comprehensive numerical and experimental studies were carried out on the seismic isolation capacity of RSM layers formed with varying rubber contents [1,[5][6][7][8][9][10]. Another example of the GSI method is developing an isolation layer using geosynthetic material with or without an RSM layer.…”

Section: Research Articlementioning

confidence: 99%

Geotechnical Seismic Isolation Method Using Rubber-Soil Mixtures

Yıldız¹

2021

NATURENGS MTU Journal of Engineering and Natural Sciences Malatya Turgut Ozal University

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Seismic isolation is a method of protecting buildings from earthquake-induced deformations by using isolators and devices under the superstructure. The purpose of the seismic isolation method is to reduce the earthquake forces transferred from the ground to the structure by placing energy-absorbing elements between the foundation and superstructure. Especially in developing countries, the "Geotechnical Seismic Isolation (GSI)" system has been proposed as an isolation method to reduce earthquake-induced damages on buildings. This study, it is aimed to reduce the effects of earthquakes in a multi-story building with an isolation layer formed by a rubbersand mixture (RSM). For this purpose, a 10-story reinforced concrete building was numerically modeled. Beneath the foundation of the building model, a seismic energy absorbent RSM layer was placed and its contact with the natural soil was interrupted by using geosynthetic liners. The model was subjected to the 1992 Erzincan (EW) Earthquake motion and its performance has been evaluated in terms of lateral displacements and accelerations. The numerical studies indicated a substantial improvement due to the use of the RSM layer. The accelerations measured by the superstructure decreased up to 48% by employing the isolation layer. The numerical analysis was carried out using the dynamic module of the PLAXIS 2D finite element analysis program.

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Performance of sand and shredded rubber tire mixture as a natural base isolator for earthquake protection

Cited by 62 publications

References 23 publications

Large‐scale field testing of geotechnical seismic isolation of structures using gravel‐rubber mixtures

Large‐scale field testing of geotechnical seismic isolation of structures using gravel‐rubber mixtures

Rural Masonry Isolating Structure and LRB Experiment: Seismic Resistance Properties and Statistical Data Curve Analyses

Geotechnical Seismic Isolation Method Using Rubber-Soil Mixtures

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