Tuned Mass Damper and Base Isolation: A Unitary Approach for the Seismic Protection of Conventional Frame Structures

Fabrizio, Cristiano; Leo, Andrea M. de; Egidio, Angelo Di

doi:10.1061/(asce)em.1943-7889.0001581

Cited by 25 publications

(18 citation statements)

References 34 publications

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“…Specifically, a 2-DOF shear-type structural model is used to describe the main dynamics of the frame structure, regardless of the number of its stories. The mechanical characteristics of such a 2-DOF model are obtained by using the dynamic equivalence criterion defined in [18], which was developed mainly for low-and medium-rise frame structures. The dynamical equivalence consists in determining both the equivalent stiffness coefficients k 1 and k 2 , and the masses m 1 and m 2 that correspond to the masses of the first story and the sum of the masses of all the stories above the first one, respectively (Figure 2a).…”

Section: Equations Of Motionmentioning

confidence: 99%

“…The dynamical equivalence consists in determining both the equivalent stiffness coefficients k 1 and k 2 , and the masses m 1 and m 2 that correspond to the masses of the first story and the sum of the masses of all the stories above the first one, respectively (Figure 2a). According to the procedure presented in [18], to derive the values for the equivalent characteristics, the DOFs u 1 and u 2 have to correspond to the displacements of the first and top stories of the structure, respectively. The following additional assumptions are at the base of the equivalence criterion:…”

Section: Equations Of Motionmentioning

confidence: 99%

“…Low-dimensional models were also used to describe the dynamics of rigid body-like structures, as in [15,16], where different active control algorithms were considered to improve the seismic performance of such structures. The seismic effectiveness of an intermediate discontinuity in a frame structure was studied in [17,18] by using a 2-DOF mechanical model; in [19,20], the authors performed analytical and experimental investigations on frame structures with inter-story isolation by using a 3-DOF model.…”

Section: Introductionmentioning

confidence: 99%

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Seismic Benefits from Coupling Frame Structures with a Hysteretic Mass Damper Inerter

Egidio

Contento

2023

Applied Sciences

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The coupling of frame structures with external oscillating bodies, such as rigid walls, dynamic mass absorbers, elastoplastic dampers, or tuned mass dampers, can be effective in reducing the displacements of the structure and protecting it against seismic loads. This paper proposes connecting an external oscillating body to the first story of a frame structure and studying the effectiveness of the coupling by evaluating the reduction in the displacements of the frame structure. The inertial effects of the oscillating body are increased by introducing a virtual mass, provided by an inerter device. The oscillating body, characterized by physical and virtual masses, is connected to the frame structure through a hysteretic device. The study is performed on a dynamically equivalent three-degree-of-freedom (3-DOF) model, whose equations are written using a direct approach. To verify the effectiveness of the protection device, named hysteretic mass damper inerter (HMDI), in reducing the displacements of the frame structure, the displacement of the first story and the drifts of the upper stories are compared to those of the frame structure not connected to the external oscillating body. An initial spectral analysis, performed on the linearized mechanical system, clarifies the role of the parameters of the external device in the dynamic behavior of the coupled system. An additional seismic analysis is performed by using three single earthquake records first, and then a set of seven additional earthquake records selected to be compatible with the design spectrum of Los Angeles. Specific spectral gain maps are used to organize the results of an extensive parametric analysis. They show that the HMDI reduces both displacements and drifts of the structure in large ranges of the parameters that characterize the HMDI. It is found that the proposed protection method is particularly effective for low- and medium-rise frame structures.

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Section: Equations Of Motionmentioning

confidence: 99%

Section: Equations Of Motionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seismic Benefits from Coupling Frame Structures with a Hysteretic Mass Damper Inerter

Egidio

Contento

2023

Applied Sciences

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“…There are many other applications, e.g., in the context of ground motions produced from even minor tremors, industrial machinery, or suburban rail transport systems degrading the structural integrity of nearby buildings, pipeline systems, and sensitive instruments; additionally, small-scale damage to structures in petrochemical industries or nuclear reactors can have devastating consequences. Traditional approaches for vibration mitigation, mostly in the form of base isolation (BI) and tuned mass damper (TMDs) have certain limitations (Zhou et al, 2002;Xiang et al, 2012;Xiang and Nishitani, 2014;Harvey and Kelly, 2016;Anajafi and Medina, 2018;Fabrizio et al, 2019): BI induces large movement of the structures which may not be acceptable, TMD works only for a narrow frequency range outside of which it may work adversely which is again a major issue because identifying the frequency contents in the structure correctly is not straightforward as it may change significantly with time due to structural degradation and environmental change (Moser and Moaveni, 2011;Wagner et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

The Influence of Clamping, Structure Geometry, and Material on Seismic Metamaterial Performance

et al. 2021

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Diverting and controlling the impact of elastic vibrations upon an infrastructure is a major challenge for seismic hazard mitigation and for the reduction of machine noise and vehicle vibration in the urban environment. Seismic metamaterials (SMs), with their inherent ability to manipulate wave propagation, provide a key route for overcoming the technological hurdles involved in this challenge. Engineering the structure of the SM serves as a basis to tune and enhance its functionality, and inspired by split rings, swiss-rolls, notch-shaped, and labyrinthine designs of elementary cells in electromagnetic and mechanical metamaterials, we investigate altering the structure geometries of SMs with the aim of creating large bandgaps in a subwavelength regime. Interestingly, clamping an SM to the bedrock creates a zero frequency stopband, but further effects can be observed in the higher frequency regime due to their specific geometry. We show that square stiff inclusions perform better in comparison to circular ones while keeping the same filling fraction. En route to enhancing the bandgap, we have also studied the performance of SMs with different constituent materials; we find that steel columns, as inclusions, show large bandgaps, however, the columns are too large for steel to be a feasible material in practical or financial terms. Non-reinforced concrete would be preferable for industry level scaling up of the technology because, concrete is cost-effective, easy to cast directly at the construction site and easy to provide arbitrary geometry of the structure. As a part of this study, we show that concrete columns can also be designed to exhibit bandgaps if we cast them within a soft soil coating surrounding the protected area for various civil structures like a bridge, building, oil pipelines, etc. Although our motivation is for ground vibration, and we use the frequencies, lengthscales, and material properties relevant for that application, it is notable that we use the equations of linear elasticity, and our investigation is more broadly relevant in solid mechanics.

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“…Kwag et al [32] studied the effects of using multiple TMDs to improve the seismic performance of a nuclear piping system that was subjected to an earthquake load. Recently, Fabrizio et al [33] analyzed the seismic response while using the spectrum of mean gain maps with respect to the FPS and TMD of the frame structure. No research has been conducted on installing a TMD in an electrical cabinet, which is an important piece of electronic equipment inside an NPP, although there have been many studies on the development and application of TMDs to reduce the seismic responses of structures.…”

Section: Introductionmentioning

confidence: 99%

Application of Tuned Mass Damper to Mitigation of the Seismic Responses of Electrical Equipment in Nuclear Power Plants

Cho¹,

Chang

Sung

2020

Energies

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A tuned mass damper (TMD) was developed for mitigating the seismic responses of electrical equipment inside nuclear power plants (NPPs), in particular, the response of an electrical cabinet. A shaking table test was performed, and the frequency and damping ratio were extracted, to confirm the dynamics of the cabinet. Electrical cabinets with and without TMDs were modeled while using SAP2000 software (Version 20, Computers and Structures, NY, USA) that was based on the results. TMDs were designed while using an optimization method and the equations of Den Hartog, Warburton, and Sadek. The numerical models were verified while using the shaking table test results. A sinusoidal sweep wave was applied as input to identify the vibration characteristics of the electrical cabinet over a wide frequency range. Applying various seismic loads that were adjusted to meet the RG 1.60 design response spectrum of 0.3 g then validated the control performance of the TMD. The minimum and maximum response spectrum reduction rates of the designed TMDs were 44.7% and 62.9%, respectively. Further, the amplification factor of the electrical cabinet with the TMD was decreased by 53%, on average, with the proposed optimization method. In conclusion, TMDs can be considered to be an effective way of enhancing the seismic performance of the electrical equipment inside NPPs.

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Tuned Mass Damper and Base Isolation: A Unitary Approach for the Seismic Protection of Conventional Frame Structures

Cited by 25 publications

References 34 publications

Seismic Benefits from Coupling Frame Structures with a Hysteretic Mass Damper Inerter

Seismic Benefits from Coupling Frame Structures with a Hysteretic Mass Damper Inerter

The Influence of Clamping, Structure Geometry, and Material on Seismic Metamaterial Performance

Application of Tuned Mass Damper to Mitigation of the Seismic Responses of Electrical Equipment in Nuclear Power Plants

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