Experimental Parametric Study and Phenomenological Modeling of a Deformable Rolling Seismic Isolator

Katsamakas, Antonios A.; Vassiliou, Michalis F.

doi:10.1080/13632469.2023.2189978

Cited by 4 publications

(2 citation statements)

References 56 publications

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“…The first and most important observation is that the behavior of the system is clearly not bilinear elastoplastic. In fact, since the sphere has deformed into an oval-shaped object, a vertical motion of the top plate was recorded both in the tests presented in this study and in [35][36][37]. This vertical motion influences the restoring force, which is positive for small displacements (up to 30 mm) but becomes negative for larger displacements due to the rolling of the sphere.…”

Section: Lateral Cyclic Responsementioning

confidence: 86%

Large-Scale Experimental Investigation of Sustainable, Low-Cost Seismic Isolators Based on Rolling Rubber Spheres

Katsamakas,

Vassiliou

2023

RILEM Bookseries

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This study presents the results of a large-scale experimental investigation of sustainable and low-cost seismic isolators based on deformable rubber spheres rolling on concrete surfaces. A potential application of the isolators could be in low-rise masonry structures in the developing world. Parameters of investigation were the type of rolling spheres, the geometry of the concrete surfaces, and the weight that each isolator supports. Initially, the compressive response of the isolators was examined. Subsequently, lateral cyclic tests were performed. Finally, 1170 shake-table tests were performed in 1:2 scale, with various different isolators subjected to a large number of ground motion excitations. Results showed that the compressive strength of the spheres was substantially higher than the design load. The nonnegligible deformability of the spheres leads to a lateral cyclic response that is different from the one of a rigid body model. The rolling friction coefficient ranged between 3.7% and 7.1%. During the shake table tests, the isolators reduced the acceleration transmitted to the superstructure (to 0.15 g) while maintaining reasonable peak and zero residual displacements. The shake table tests were repeatable, and the isolators did not deteriorate even after subjected to 65 ground motion excitations.

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Section: Lateral Cyclic Responsementioning

confidence: 86%

Large-Scale Experimental Investigation of Sustainable, Low-Cost Seismic Isolators Based on Rolling Rubber Spheres

Katsamakas,

Vassiliou

2023

RILEM Bookseries

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“…The subject of base isolation technology used for seismic protection in general has received extensive attention in recent decades, [20][21][22] and numerous investigations into response control and seismic isolation were conducted. Remarkable progress has been achieved in advancing these technologies, 23,24 which fall in the well-known "passive control" category of structural control.…”

Section: Introductionmentioning

confidence: 99%

Displacement‐based design procedures for rigid block isolation

Destro Bisol,

DeJong,

Liberatore

et al. 2024

Earthq Engng Struct Dyn

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When subjected to earthquakes, many objects or structural elements behave like rocking rigid blocks. Computer servers, medical shelves, art objects, statues, and electrical transformers are frequently included in this category. Protection of these objects is an important task, considering that their value could be inestimable or their operation crucial during earthquakes; base isolation technology has been proven to be a viable option for this purpose. Initially, the dynamic model of a rocking rigid block placed on a base isolation device is reviewed. Then, two equivalent‐static displacement‐based procedures for designing the isolators for these types of objects are proposed, and the main steps are illustrated. The first procedure aims to determine isolator characteristics to prevent the initiation of rocking motion during the code‐level earthquake event. The second procedure is aimed at designing isolators that allow a specified maximum rotation of the block during seismic events. The proposed procedures are validated by means of time‐history analyses for a suite of spectrum‐compatible accelerograms. The first displacement‐based procedure appears particularly suitable for objects of small to medium size. The validation of the second procedure demonstrates that the equal displacement rule can be applied for this kind of systems, despite their softening. The results also indicate that the approach is particularly effective for medium to large structures/objects, if small oscillations are acceptable. The controlled rocking procedure offers a significant advantage by allowing for a reduction in the maximum displacement and period of the isolator, compared to situations where rocking motion must be prevented entirely.

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Vibration Isolation Capabilities of a Low-Cost Seismic Isolation System Based on Elastomeric Rolling Spheres for Masonry Structures

Reyes,

Katsamakas,

Vassiliou

2023

RILEM Bookseries

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Experimental Parametric Study and Phenomenological Modeling of a Deformable Rolling Seismic Isolator

Cited by 4 publications

References 56 publications

Large-Scale Experimental Investigation of Sustainable, Low-Cost Seismic Isolators Based on Rolling Rubber Spheres

Large-Scale Experimental Investigation of Sustainable, Low-Cost Seismic Isolators Based on Rolling Rubber Spheres

Displacement‐based design procedures for rigid block isolation

Vibration Isolation Capabilities of a Low-Cost Seismic Isolation System Based on Elastomeric Rolling Spheres for Masonry Structures

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