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Shake Table Testing and Model Valida...

State University of New York at Buffalo., Civil, Structural and Environmental Engineering.

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Shake Table Testing and Model Validation of a Seismic Isolation System for Lightweight Structures.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Shake Table Testing and Model Validation of a Seismic Isolation System for Lightweight Structures./
Author:	Lopez Restrepo, Sebastian.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2024,
Description:	919 p.
Notes:	Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
Contained By:	Dissertations Abstracts International85-12B.
Subject:	Architectural engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31298730
ISBN:	9798382831640

Shake Table Testing and Model Validation of a Seismic Isolation System for Lightweight Structures.
Lopez Restrepo, Sebastian.

Shake Table Testing and Model Validation of a Seismic Isolation System for Lightweight Structures. - Ann Arbor : ProQuest Dissertations & Theses, 2024 - 919 p.

Source: Dissertations Abstracts International, Volume: 85-12, Section: B.

Thesis (Ph.D.)--State University of New York at Buffalo, 2024.

Seismic base isolation is employed worldwide to protect a wide variety of structures. However, the implementation of this type of seismic protection system in houses and lightweight structures is limited, with the exception of Japan, where nearly 5000 houses are base-isolated with highly engineered isolation systems. These systems have not been adopted in growing economies with high seismic hazard, such as Turkey or Colombia, due to their cost, the difficulties in locally fabricating their components, and their incompatibility with local construction practices. Although efforts have been made to find alternative isolation devices for lightweight structures with similar features to those employed in Japan, the proposed solutions are not reliable, and their limitations are only mitigated when employing fabrication techniques and materials corresponding to well-established isolation techniques, such as friction pendulum type bearings, which are not low-cost isolation systems for lightweight structures.Previous studies on low-cost isolation systems for lightweight structures showed that isolation devices with rolling elements are better suited for low-cost isolation systems than those based on friction. A low-cost isolation system based on a deformable rolling bearing developed at the University at Buffalo has simple components that can be manufactured anywhere, has a large displacement capacity, and features a fail-safe mechanism. The bearing is composed of one flat and one concave plate and a rubber rolling ball, either made solid or with a steel core. This dissertation expanded the research on the deformable rolling bearing by testing it on a shake table using half-length scale versions of prototype houses and small bridges in three-directional seismic excitation. The results showed that the deformable rolling bearings provide significant seismic protection of lightweight structures against strong ground motions, which in the testing reached a{A0}maximum peak ground velocity of 1.2m/s and a peak ground acceleration of 4g in the horizontal direction and up to 1g in the vertical direction. The isolation system was particularly effective in the horizontal direction, whereas it did not provide any vertical isolation. The tests included cases of extreme response which included vertical impact within the bearing's components and uplift of the isolated structure.A model of behavior of the isolator was developed to capture a very complex behavior observed in the testing. The experimental results were used to validate the analytical model. Comparisons of analytical and experimental results showed that the analytical model predicts the horizontal isolator displacements and the accelerations of the structure with acceptable accuracy.

ISBN: 9798382831640Subjects--Topical Terms:

3174102
Architectural engineering.
Subjects--Index Terms:

Deformable rolling bearings

Shake Table Testing and Model Validation of a Seismic Isolation System for Lightweight Structures.
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245 1 0 $a Shake Table Testing and Model Validation of a Seismic Isolation System for Lightweight Structures.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2024
300 $a 919 p.
500 $a Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
500 $a Advisor: Constantinou, Michael C.
502 $a Thesis (Ph.D.)--State University of New York at Buffalo, 2024.
520 $a Seismic base isolation is employed worldwide to protect a wide variety of structures. However, the implementation of this type of seismic protection system in houses and lightweight structures is limited, with the exception of Japan, where nearly 5000 houses are base-isolated with highly engineered isolation systems. These systems have not been adopted in growing economies with high seismic hazard, such as Turkey or Colombia, due to their cost, the difficulties in locally fabricating their components, and their incompatibility with local construction practices. Although efforts have been made to find alternative isolation devices for lightweight structures with similar features to those employed in Japan, the proposed solutions are not reliable, and their limitations are only mitigated when employing fabrication techniques and materials corresponding to well-established isolation techniques, such as friction pendulum type bearings, which are not low-cost isolation systems for lightweight structures.Previous studies on low-cost isolation systems for lightweight structures showed that isolation devices with rolling elements are better suited for low-cost isolation systems than those based on friction. A low-cost isolation system based on a deformable rolling bearing developed at the University at Buffalo has simple components that can be manufactured anywhere, has a large displacement capacity, and features a fail-safe mechanism. The bearing is composed of one flat and one concave plate and a rubber rolling ball, either made solid or with a steel core. This dissertation expanded the research on the deformable rolling bearing by testing it on a shake table using half-length scale versions of prototype houses and small bridges in three-directional seismic excitation. The results showed that the deformable rolling bearings provide significant seismic protection of lightweight structures against strong ground motions, which in the testing reached a{A0}maximum peak ground velocity of 1.2m/s and a peak ground acceleration of 4g in the horizontal direction and up to 1g in the vertical direction. The isolation system was particularly effective in the horizontal direction, whereas it did not provide any vertical isolation. The tests included cases of extreme response which included vertical impact within the bearing's components and uplift of the isolated structure.A model of behavior of the isolator was developed to capture a very complex behavior observed in the testing. The experimental results were used to validate the analytical model. Comparisons of analytical and experimental results showed that the analytical model predicts the horizontal isolator displacements and the accelerations of the structure with acceptable accuracy.
590 $a School code: 0656.
650 4 $a Architectural engineering. $3 3174102
650 4 $a Environmental engineering. $3 548583
653 $a Deformable rolling bearings
653 $a Half-length scale testing
653 $a Lightweight structures
653 $a Rolling motion
653 $a Seismic isolation
653 $a Shake table testing
690 $a 0543
690 $a 0775
690 $a 0462
710 2 $a State University of New York at Buffalo. $b Civil, Structural and Environmental Engineering. $3 1023703
773 0 $t Dissertations Abstracts International $g 85-12B.
790 $a 0656
791 $a Ph.D.
792 $a 2024
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31298730