Top disconnection versus base disconnection in structures subjected to harmonic base excitation

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

doi:10.1016/j.engstruct.2017.09.041

Cited by 14 publications

(8 citation statements)

References 15 publications

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“…Comparisons between the displacements and drifts (u 1 and u 2 − u 1 ) of the uncoupled and coupled frame structures (i.e., stand-alone frame structure and frame structure coupled with the protection device) are used to assess the ability of the HMDI to protect the structure against seismic excitation. As in Fabrizio et al's study [17], the two gain parameters are introduced as follows:…”

Section: Gain Parametersmentioning

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: Gain Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Egidio

Contento

2023

Applied Sciences

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“…For instance, in [1,2,18,19], the studied systems are represented by archetype 2-DOF models. A similar approach, aimed at studying the general behaviour of the inter-storey isolation with a 2-DOF archetype model of the structure, has been presented in [20][21][22]. Specifically, in [20,21] and in this paper, the inter-storey isolation is named intermediate discontinuity, since it represents a sudden change in the stiffness of the structure.…”

Section: Introductionmentioning

confidence: 99%

“…A similar approach, aimed at studying the general behaviour of the inter-storey isolation with a 2-DOF archetype model of the structure, has been presented in [20][21][22]. Specifically, in [20,21] and in this paper, the inter-storey isolation is named intermediate discontinuity, since it represents a sudden change in the stiffness of the structure. A 2-DOF model is suitable to describe systems where the isolation is placed at higher or lower levels, but cannot properly describe systems where the isolation is placed at middle-floors.…”

Section: Introductionmentioning

confidence: 99%

Seismic Performance of Frame Structure with Hysteretic Intermediate Discontinuity

2023

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The introduction of an intermediate discontinuity in frame structures is commonly named inter-storey isolation. Inter-storey isolation is an effective technique for the seismic protection of new or existing frame structures. The devices that are used to perform the discontinuity, mainly of the structural stiffness, are placed at a higher storey level of the structure and not at the base level. In the latter years, this technique has gained increasing interest because, especially for existing buildings, it is cheaper and technically easier to implement than base isolation. In this paper, the attention is focused on the effects on a frame structure of an intermediate elasto-plastic discontinuity that can be described by a Bouc-Wen model. The frame structure with the intermediate discontinuity is modelled with a 3-DOF reduced model. Its dynamical behaviour is investigated by considering both harmonic and seismic external excitation. The results are summarized in gain maps aimed at finding the parameters that optimize the seismic behaviour of the structure.

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“…This idea is to provide supplemental damping by inducing a vibration energy transfer from the structural portion below the isolation system to the structural portion above it. Top, intermediate, and base discontinuity in frame structures to investigate the capability to mitigate the effects of seismic ground motions are discussed in [7,8]. Ref.…”

Section: Introductionmentioning

confidence: 99%

Experimental Dynamic Response of a Multi-Story Frame Structure Equipped with Non-Conventional TMD Implemented via Inter-Story Isolation

Basili

Angelis

2022

Applied Sciences

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A shaking table experiment conducted on a multi-degrees-of-freedom frame structure equipped with a non-conventional tuned mass damper (TMD) is presented. The non-conventional TMD is characterized by a high mass ratio, without adding further structural masses, and is realized via inter-story isolation. The structure top story mass of a four-story steel frame structure is isolated and converted into tuned mass, connecting to the substructure with two high damping rubber bearings placed in series. Aspects related to the dynamic structural response as well as the seismic effectiveness assessment of a non-conventional TMD are addressed. Three structural configurations are tested: the reference four-story structure, the three-story intermediate structure, and the three-story structure equipped with a non-conventional TMD. The input motion conditions considered are: white noise, sine sweep, and natural earthquakes. Through experiments, structural identification is carried out and different dynamic behaviors emerge for the configurations tested. The nonlinear effects provoked on the structure by the adopted isolators are investigated, showing high dissipative capabilities in a wide range of amplitudes of the excitation. It is demonstrated that a non-conventional TMD is a smart control strategy useful for enhancing structural vibration mitigation.

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Top disconnection versus base disconnection in structures subjected to harmonic base excitation

Cited by 14 publications

References 15 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

Seismic Performance of Frame Structure with Hysteretic Intermediate Discontinuity

Experimental Dynamic Response of a Multi-Story Frame Structure Equipped with Non-Conventional TMD Implemented via Inter-Story Isolation

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