Seismic control of flexible rocking structures using inerters

Thiers-Moggia, R.; Mariotti, C.

doi:10.1002/eqe.3315

Cited by 29 publications

(26 citation statements)

References 42 publications

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“…With this design option, the amount of rotation would be very limited. The second kind of control is the use of energy dissipation devices (Figure 1D), such as the base‐plate‐yielding rocking systems, 15 the replaceable reinforcing steel bars in short length, 16 the dampers 17–19 or the inerters 20–24 . The third kind is the combined use of the prestressing cables and energy dissipation devices, such as the combination of cables with the dampers, 25 the energy dissipation bars, 26 the steel sleeve, 27,28 or the O‐shaped connectors 29,30 …”

Section: Introductionmentioning

confidence: 99%

Seismic protection by rocking with superelastic tendon restraint

Tsang

Lam

2022

Earthq Engng Struct Dyn

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This article introduces an innovative system for enhancing the seismic performance of a structure through facilitating large rotational (rocking) motion to occur without risking overturning. The innovation of this study is in the use of tendons consisting of Nickel‐Titanium (superelastic) alloy connected in series with steel to impose partial restraints to the structure when experiencing rocking motion. Importantly, the large rotational motion is fully recoverable. Existing installations which can be made to rock may also be retrofitted with the device for improving its seismic resistance. The original contributions of the article are the derivation, and experimental validation, of an analytical model for simulating the seismic performance of a system that has been fitted with the restraining device. In a parametric study employing the newly developed modelling techniques, major trends in the seismic response behaviour of the structure have been identified.

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Section: Introductionmentioning

confidence: 99%

Seismic protection by rocking with superelastic tendon restraint

Tsang

Lam

2022

Earthq Engng Struct Dyn

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“…Rocking is also a promising seismic response modification technique, both for bridges and buildings, with practical applications in the former USSR and New Zealand. Applications in buildings may comprise a soft-rocking-story mechanism [35][36][37], or a rocking wall [38,39], whereas in bridges, rocking piers [40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56]. Several analytical studies investigated the response of rocking structures combined with external dampers or restraining tendons [57][58][59][60].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Rocking and Sliding Cylindrical Columns Under Seismic Excitation

Katsamakas¹,

Vassiliou²

2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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This paper presents a finite element (FE) modeling approach for simulating the 3D response of a free-standing cylindrical column. The model is validated against experimental results, which involved testing of the cylindrical steel column under a set of 100 bidirectional ground motions. The specimen was free-standing and allowed to slide and rock in all directions. Both the tested specimen and the shake table platen were stiff enough to be modeled as rigid. The contact surface was modeled using Coulomb friction for the tangential behavior and stiff contact for the normal direction. Two energy dissipation mechanisms were modelled; friction and radiation damping. Since Rayleigh damping is not directly linked to the physical problem, it was set equal to zero. It has been proven that the response of a single column to an individual ground motion is a chaotic and unpredictable problem. Therefore, a statistical approach was utilized to compare the numerical to the experimental results, using the cumulative distribution function (CDF) for the main response quantities (i.e., maximum displacement at the top of the column and residual displacement), demonstrating satisfying agreement. The influence of the friction coefficient was assessed through an extensive sensitivity analysis using non-linear time-history analyses. Results proved that the statistics of the response only smoothly depend on the exact value of the friction coefficient even though the response to an individual ground motion seems chaotic.

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“…The model presented here is conceptually similar to the flexible rocking body models presented in [20,21,22] or [23], where the flexible rocking model was used to interpret the experimental response of tuff walls. However, the novelty of the paper is not in the description of a flexible rocking structure but in the investigation of the behaviour of a structure where specific devices are added to guide its deformation with the aim of reducing the amplitude of the rocking oscillation and preventing the overturning.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Dynamic and Seismic Behaviour of Cabinets Through Controlled Deformation

Pagliaro¹,

Egidio²,

Contento³

2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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In this paper the possibility to improve the dynamic and seismic response of cabinets that can exhibit rocking dynamics is investigated. The generic cabinet is modelled as an assembly of rigid components and can undergo a change of configuration. The scope of the research is to verify if the allowed deformation could protect the cabinet by preventing the overturning or reducing the amplitude of rocking oscillations. The control of the deformation is obtained by using linear visco-elastic devices, whose mechanical characteristics are at the base of the parametric analysis performed in the paper. An extensive parametric analysis is carried out by numerically integrating the equations of motion. The effectiveness of this protection method is analyzed by comparing the behaviour of rigid and deformable cabinets under one-sine pulse and seismic excitations. For the one-sine pulse excitation, the comparison is made with overturning spectra that provide the amplitude of the excitation able to overturn the cabinets versus its circular frequency. For the seismic excitation, the comparison is performed by using different registered earthquakes and comparing the maximum rocking angle reached during the motion. The results show that the ability of cabinets to change their configuration improves the dynamical and seismic performances compared to those of the equivalent rigid cabinets. COMPDYN 2021 8 th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering M. Papadrakakis, M. Fragiadakis (eds.

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Seismic control of flexible rocking structures using inerters

Cited by 29 publications

References 42 publications

Seismic protection by rocking with superelastic tendon restraint

Seismic protection by rocking with superelastic tendon restraint

Numerical Modeling of Rocking and Sliding Cylindrical Columns Under Seismic Excitation

Improvement of Dynamic and Seismic Behaviour of Cabinets Through Controlled Deformation

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