Use of Friction Pendulum System for Seismic Isolation of Museum Artifacts: Mathematical Modeling and Parametric Study

Abdullah Çelik; C. Oktay Azeloğlu

Article Details

Use of Friction Pendulum System for Seismic Isolation of Museum Artifacts: Mathematical Modeling and Parametric Study

Authors:

Abdullah Çelik | C. Oktay Azeloğlu

Publisher:

Gazi University

Main Topics:

Dinamikler | Titreşim ve Titreşim Kontrolü

Journal:

Politeknik Dergisi Vol.27 Issue 6, pp.2313-2324

Document Type:

Article

Publication Date:

12/2024

Document Language:

English

Document ID (Org No.):

2001333514

pISSN:

2147-9429

Keywords:

Abstract:

 ABSTRACT Earthquakes seriously threaten precious artifacts in museums worldwide. Many historical pieces of inestimable importance that are considered the common heritage of humanity have been damaged by earthquakes. Robust measures must be put in place to protect museum artifacts from the perils associated with seismic risks. Seismic isolation devices like spherically shaped bearings are one of the best options to prevent seismic damage of museum artifacts thanks to achieving a long period under low weights. Therefore, the objective of this research is to assess the effectiveness of friction pendulum-type isolators, one of the spherically shaped bearings, in seismic isolation of museum artifacts and to identify the appropriate design parameters. In this study, a non-isolated single-degree-of-freedom model and a 2-degree-of-freedom model isolated with a single friction pendulum bearing inside a building were established for a museum artifact. A parametric study was conducted using the root mean square and the maximum accelerations and displacements of the isolated mass at different values of friction coefficient and effective radius of curvature, as well as the maximum displacement of the friction pendulum system. Afterward, the non-isolated and isolated mass responses were compared in the time domain based on selected parameters obtained from the parametric study. The behavior of the isolator was analyzed, and its effectiveness was evaluated.

 ABSTRACT Earthquakes seriously threaten precious artifacts in museums worldwide. Many historical pieces of inestimable importance that are considered the common heritage of humanity have been damaged by earthquakes. Robust measures must be put in place to protect museum artifacts from the perils associated with seismic risks. Seismic isolation devices like spherically shaped bearings are one of the best options to prevent seismic damage of museum artifacts thanks to achieving a long period under low weights. Therefore, the objective of this research is to assess the effectiveness of friction pendulum-type isolators, one of the spherically shaped bearings, in seismic isolation of museum artifacts and to identify the appropriate design parameters. In this study, a non-isolated single-degree-of-freedom model and a 2-degree-of-freedom model isolated with a single friction pendulum bearing inside a building were established for a museum artifact. A parametric study was conducted using the root mean square and the maximum accelerations and displacements of the isolated mass at different values of friction coefficient and effective radius of curvature, as well as the maximum displacement of the friction pendulum system. Afterward, the non-isolated and isolated mass responses were compared in the time domain based on selected parameters obtained from the parametric study. The behavior of the isolator was analyzed, and its effectiveness was evaluated.

 ABSTRACT Earthquakes seriously threaten precious artifacts in museums worldwide. Many historical pieces of inestimable importance that are considered the common heritage of humanity have been damaged by earthquakes. Robust measures must be put in place to protect museum artifacts from the perils associated with seismic risks. Seismic isolation devices like spherically shaped bearings are one of the best options to prevent seismic damage of museum artifacts thanks to achieving a long period under low weights. Therefore, the objective of this research is to assess the effectiveness of friction pendulum-type isolators, one of the spherically shaped bearings, in seismic isolation of museum artifacts and to identify the appropriate design parameters. In this study, a non-isolated single-degree-of-freedom model and a 2-degree-of-freedom model isolated with a single friction pendulum bearing inside a building were established for a museum artifact. A parametric study was conducted using the root mean square and the maximum accelerations and displacements of the isolated mass at different values of friction coefficient and effective radius of curvature, as well as the maximum displacement of the friction pendulum system. Afterward, the non-isolated and isolated mass responses were compared in the time domain based on selected parameters obtained from the parametric study. The behavior of the isolator was analyzed, and its effectiveness was evaluated.

 ÖZ Depremler, bütün dünyada müzelerdeki değerli eserleri ciddi şekilde tehdit etmektedir. İnsanlığın ortak mirası olarak kabul edilen paha biçilemez öneme sahip pek çok tarihi eser depremlerden zarar görmüştür. Müze eserlerini sismik risklerle ilgili tehlikelerden korumak için ciddi önlemler alınmalıdır. Küresel şekilli mesnetler gibi sismik izolasyon cihazları, düşük ağırlıklar altında periyodu uzatabilmeleri sayesinde müze eserlerinin sismik etkiler sebebiyle hasar görmesini önlemek için en iyi seçeneklerden biridir. Bu nedenle, bu çalışma küresel şekilli mesnetlerden biri olan sürtünmeli sarkaç tipi izolatörlerin müze eserlerinin sismik izolasyonundaki etkinliğini araştırmayı ve uygun tasarım parametrelerini belirlemeyi amaçlamaktadır. Bu çalışmada, bir müze eseri için izole edilmemiş tek serbestlik dereceli ve bina içinde tekli sürtünmeli sarkaç tipi izolatör ile izole edilmiş iki serbestlik dereceli bir model kurulmuştur. Farklı efektif eğrilik yarıçapı ve sürtünme katsayısı değerleri için izole kütlenin maksimum ve ortalama karekök ivme ve yer değiştirme değerleri ile izolatörün maksimum yer değiştirme değeri için parametrik bir çalışma yapılmıştır. Daha sonra, izole edilmemiş kütlenin ve parametrik çalışma sonucu seçilen parametrelere sahip bir izolatörle izole edilen kütlenin tepkileri zaman tanım alanında karşılaştırılmış, izolatörün davranışı analiz edilmiş ve etkinliği değerlendirilmiştir.

Article Details

Use of Friction Pendulum System for Seismic Isolation of Museum Artifacts: Mathematical Modeling and Parametric Study

Authors:

Abdullah Çelik | C. Oktay Azeloğlu

Publisher:

Gazi University

Main Topics:

Dinamikler | Titreşim ve Titreşim Kontrolü

Journal:

Politeknik Dergisi Vol.27 Issue 6, pp.2313-2324

Document Type:

Article

Publication Date:

12/2024

Document Language:

English

Document ID (Org No.):

2001333514

pISSN:

2147-9429

Seismic isolation

friction pendulum system

museum artifact.Sismik izolasyon

sürtünmeli sarkaç sistemi

müze eseri.

Issues

Article Details

Use of Friction Pendulum System for Seismic Isolation of Museum Artifacts: Mathematical Modeling and Parametric Study

Authors: Abdullah Çelik | C. Oktay Azeloğlu

Publisher: Gazi University

Main Topics: Dinamikler | Titreşim ve Titreşim Kontrolü

Journal: Politeknik Dergisi Vol.27 Issue 6, pp.2313-2324

Document Type: Article

Publication Date: 12/2024

Document Language: English

Document ID (Org No.): 2001333514

pISSN: 2147-9429

Seismic isolation

friction pendulum system

museum artifact.Sismik izolasyon

sürtünmeli sarkaç sistemi

müze eseri.

Issues

Authors:

Abdullah Çelik | C. Oktay Azeloğlu

Publisher:

Gazi University

Main Topics:

Dinamikler | Titreşim ve Titreşim Kontrolü

Journal:

Politeknik Dergisi Vol.27 Issue 6, pp.2313-2324

Document Type:

Article

Publication Date:

12/2024

Document Language:

English

Document ID (Org No.):

2001333514

pISSN:

2147-9429