Abstract

This paper analyzes the influence of horizontal damped and undamped restraints in terms of the amplification of the response of rocking masonry walls subjected to seismic excitations. It also makes a practical contribution to the design of antiseismic devices conceived to control rocking motion, avoiding or at least limiting undesirable response amplifications that would lead to local or global failure. A horizontal restraint, simulating an elastoplastic steel tie-rod, was coupled with a damper, whose action is included in a proposed equation of motion. Parametric analyses were performed for three typical façades of masonry buildings, showing that, if the stiffness of tie-rod increases, the seismic vulnerability of a rocking façade is not necessarily reduced. Therefore, the calculation of rocking spectra is recommended in order to identify stiffness ranges in which amplification could occur. A simple method for calculating the design damping coefficient of a shock absorber is proposed and the consequent mitigation of vulnerability is demonstrated in various analysis configurations. Graphs plotting time-dependent ratios between the energy dissipated by the shock absorber and the seismic input energy are shown to be a useful tool for quantifying the effectiveness of the shock absorber itself in dissipating energy. The reduction of these time-dependent ratios occasionally observed for specific earthquake time ranges reveals that adverse frequencies are occasionally present in seismic excitation and allows for the identification of the optimal damping coefficient.

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Data Availability Statement

Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.

Acknowledgments

The authors wish to thank the Technical University of Munich (TUM) University Foundation Fellowship of ForTE for supporting this research.

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Go to Journal of Structural Engineering
Journal of Structural Engineering
Volume 148Issue 2February 2022

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Received: Oct 12, 2020
Accepted: Jul 21, 2021
Published online: Nov 19, 2021
Published in print: Feb 1, 2022
Discussion open until: Apr 19, 2022

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Assistant Professor, Dept. of Civil and Industrial Engineering, Univ. of Pisa, Largo Lazzarino 1, Pisa 56100, Italy (corresponding author). ORCID: https://orcid.org/0000-0001-6913-7468. Email: [email protected]
F. Taddei, Ph.D. [email protected]
Assistant Professor, Lehrstuhl fuer Baumechanik, Technical Univ. of Munich, Arcisstr. 21, München 80333, Germany. Email: [email protected]
Engineer, Dept. of Energy, Systems, Territory and Construction Engineering, Univ. of Pisa, Largo Lazzarino 1, Pisa 56100, Italy. ORCID: https://orcid.org/0000-0001-5030-0982. Email: [email protected]
Professor, Lehrstuhl fuer Baumechanik, Technical Univ. of Munich, Arcisstr. 21, München 80333, Germany. Email: [email protected]
Professor, Dept. of Civil and Industrial Engineering, Univ. of Pisa, Largo Lazzarino 1, Pisa 56100, Italy. ORCID: https://orcid.org/0000-0003-1503-9234. Email: [email protected]

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