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Roof Isolation with Tuned Mass-based Systems and Application to a Prefabricated Building

  • Research Article - Civil Engineering
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Abstract

The earthquake-resistant design of prefabricated buildings is currently the focus of attention, especially for industrial buildings that require a high level of seismic protection. The standard design approach, based on ductility requirements, may succeed in preventing building collapse during a severe earthquake, but at the expense of accepting a high damage level at the column bases. To improve the seismic performance of such buildings, different innovative techniques have been proposed. However, these have not been widely implemented in engineering practice due, among others, to the lack of simple conceptual design methodologies. To achieve this goal, a methodology for the design of a roof isolation system is presented, where the roof isolation serves as non-conventional tuned mass damper (TMD), giving a significantly reduced response in terms of displacements and forces. To that effect, design expressions for the TMD period and damping, depending on the building and soil characteristics, are proposed: The expressions have been calibrated based on numerical parametric time history analyses considering Eurocode 8 spectrum—compatible accelerograms. The application of the proposed methodology is demonstrated for a two-story prefabricated building.

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Abbreviations

m s :

Mass of the main system

m TMD :

Mass of the secondary system (TMD)

k s :

Stiffness of the main system

k TMD :

Stiffness of the secondary system (TMD)

c TMD :

Viscous damping of the secondary system (TMD)

\({\omega_{\rm TMD}}\) :

Frequency of the secondary system (TMD)

\({\omega_{\rm s}}\) :

Frequency of the main system

\({{\xi }_{\rm TMD}}\) :

Critical damping ratio of the secondary system (TMD)

\({{\xi }_{\rm s}}\) :

Critical damping ratio of the main system (structure)

\({\alpha}\) :

Frequency ratio between secondary system and main system

\({\mu}\) :

Mass ratio between secondary system and main system

\({\omega}\) :

Frequency of the exciting force

\({{\omega}_{{\rm g}}}\) :

Frequency of the ground

\({{\xi }_{\rm g}}\) :

Damping ratio of the ground

\({\Phi_{i, j}}\) :

Amplitude of modes normalized to return the modal participation factor equal to unity

\({\phi_{i, j}}\) :

Amplitude of modal eigenvector

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Authors and Affiliations

  1. Dipartimento di Ingegneria Strutturale e Geotecnica, Sapienza Università di Roma, Via Eudossiana 18, 00184, Rome, Italy

    Nicola Nisticò

  2. 24 Pudding Chare, Newcastle, NE1 1UE, UK

    Eleftheria E. Gkagka

  3. School of Civil Engineering, Institute of Steel Structures, National Technical University of Athens, 9 Iroon Polytechneiou Str, 15780, Athens, Greece

    Charis J. Gantes

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  1. Nicola Nisticò
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  2. Eleftheria E. Gkagka
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  3. Charis J. Gantes
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Correspondence to Nicola Nisticò.

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Nisticò, N., Gkagka, E.E. & Gantes, C.J. Roof Isolation with Tuned Mass-based Systems and Application to a Prefabricated Building. Arab J Sci Eng 40, 431–442 (2015). https://doi.org/10.1007/s13369-014-1537-1

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