Combined primary–secondary system approach to the design of an equipment isolation system with High-Damping Rubber Bearings

Reggio, Anna; Angelis, Maurizio De

doi:10.1016/j.jsv.2013.12.006

Cited by 36 publications

(28 citation statements)

References 20 publications

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“…Traditional systems utilized for vibration control include isolation, for example, [1][2][3][4], energy dissipation [5][6][7][8][9] and Tuned Mass Dampers (TMDs) [10,11]. The concept of TMD had a large diffusion especially in civil and mechanical engineering applications, because of simplicity in design, operation and maintenance, reliability and cost effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Optimal design and performance evaluation of systems with Tuned Mass Damper Inerter (TMDI)

Pietrosanti

Angelis

Basili

2017

Earthq Engng Struct Dyn

259

135

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Summary The paper concerns the optimal design and performance evaluation of a Tuned Mass Damper Inerter (TMDI) to reduce dynamic vibrations. The system exploits properties of the inerter, a two‐terminal mechanical device able to produce a force proportional to the relative acceleration between terminals, with the ability of generating an apparent mass even two orders of magnitude greater than its own physical mass. A primary single‐degree‐of‐freedom structure is equipped with a classical linear Tuned Mass Damper (TMD), the secondary structure, whose mass is connected to the ground via an inerter. The optimal design of the TMDI is conducted by assuming a white noise process as base input and utilizing three different design methodologies: displacement minimization, acceleration minimization and maximization of the ratio between the energy dissipated in the secondary system and the total input energy. Optimal results obtained with the different methodologies are carried out and compared. Two limit cases are also considered when the inerter is not contemplated: conventional and non‐conventional TMDs, characterized by a low and a large mass ratio, respectively. The TMDI performance is evaluated and compared with conventional and non‐conventional TMDs; moreover, its robustness is assessed with a sensitivity analysis varying the design parameters. Attention is focused not exclusively on the primary structure response but also on the secondary one. Finally, the effectiveness of the optimally designed TMDI is evaluated having considered earthquake base excitation. Results demonstrate the effectiveness of TMDI systems for dynamic response reduction with superior performances and robustness than classical TMDs. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Optimal design and performance evaluation of systems with Tuned Mass Damper Inerter (TMDI)

Pietrosanti

Angelis

Basili

2017

Earthq Engng Struct Dyn

259

135

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“…As emphasized by Reggio and De Angelis (2014) and Chen and Soong (1988), the relevance of the dynamic interaction between a primary subsystem and a secondary subsystem could be evaluated by comparing dynamic analyses carried out through a decoupled and coupled approach. For the decoupled analysis, the selected ground motion input is the frequent artificial accelerogram with 550-mm/s 2 PGA, exciting only in the y-direction.…”

Section: Discussion and Verification Of The Optimized Parametersmentioning

confidence: 99%

Seismic behavior of RC structures with absence of floor slab constraints and large mass turbine as a non-conventional TMD: a case study

Ding

Tao

Zhou

et al. 2015

Bull Earthquake Eng

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This paper presents a case study on the influence of absence of floor slab constraints and large mass turbine as a non-conventional tuned mass damper (TMD) on the seismic behavior of the structure and members. The investigated structural system is a reinforced concrete (RC) shear wall-frame power plant structure with large slab openings and a large mass turbine. In RC structures, the existence of floor slabs can usually provide strong constraints on beams so as to greatly increase their bearing capacity. However, due to some special functional demands, large area of slabs may have to be removed so that some floor beams will lose the constraints provided by slabs. In such cases, beams could be subjected to complex internal forces and develop unexpected failure modes under earthquake actions. Nonlinear time history analyses are conducted by using the self-developed program COMPONA-MARC Version 1.0. The numerical model employs fiber beam-column elements with distributed plasticity approach which can elaborately simulate the complex seismic behavior of structural members without slab constraints including the significant transverse vibration damage mechanism. For the seismic effectiveness of the turbine as a TMD with large mass ratio, the optimized parameters are discussed and verified by extensive numerical examples under a wide selection of ground acceleration time histories. The acceleration responses of the turbine are analyzed and found to satisfy the corresponding requirements. The dynamic interaction between the structure and turbine is evaluated and the effects of mass ratio and multiple supporting springs on the dynamic response of the turbine are investigated. It is found that the acceleration response of the turbine modeled with multiple supporting springs is evidently larger than that modeled with a single degree-of-freedom system, and the floor response spectrum decreases significantly with the increase of the mass ratio.

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“…Base isolation is used on different scales, from decoupling a superstructure from its substructure resting on a shaking ground, thus protecting a building or nonbuilding structure's integrity down to a single room in a building. Floor isolation technology can be an efficient and cost‐effective means for providing seismic protection for precision equipment or delicate works of art …”

Section: Introductionmentioning

confidence: 99%

“…Floor isolation technology can be an efficient and cost-effective means for providing seismic protection for precision equipment or delicate works of art. [6][7][8]…”

Section: Introductionmentioning

confidence: 99%

Influence of the characteristics of isolation and mitigation devices on the response of single‐degree‐of‐freedom vibro‐impact systems with two‐sided bumpers and gaps via shaking table tests

Andreaus

Angelis

2020

Struct Control Health Monit

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Summary During strong earthquakes, structural pounding may occur between structures (buildings, bridges, strategic facilities, critical equipment, etc.) and the surrounding moat wall because of the limited separation distance and the deformations of the isolator. An arrangement that favors the solution of this problem is the interposition of shock absorbers. Thus, the influence of geometrical and mechanical characteristics of isolation and mitigation devices on nonlinear, nonsmooth response of vibro‐impact systems is experimentally investigated in this paper on the basis of a laboratory campaign of experimental tests. Shaking table tests were carried out under a harmonic excitation in order to investigate two different configurations: the absence and the presence of bumpers. Three different values of the table acceleration peak were applied, four different amplitude values of the total gap between mass and bumpers were considered, and also four different types of bumpers were employed; moreover, two problems were addressed, namely, control of excessive displacements and control of excessive accelerations, and hence, two types of normalization were adopted in order to better interpret experimental results. Suitable choices of pairs of bumpers and gaps were suggested as a trade‐off between conflicting objectives. Furthermore, a numerical model was proposed, and its governing parameters identified in order to simulate the experimental results.

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Combined primary–secondary system approach to the design of an equipment isolation system with High-Damping Rubber Bearings

Cited by 36 publications

References 20 publications

Optimal design and performance evaluation of systems with Tuned Mass Damper Inerter (TMDI)

Optimal design and performance evaluation of systems with Tuned Mass Damper Inerter (TMDI)

Seismic behavior of RC structures with absence of floor slab constraints and large mass turbine as a non-conventional TMD: a case study

Influence of the characteristics of isolation and mitigation devices on the response of single‐degree‐of‐freedom vibro‐impact systems with two‐sided bumpers and gaps via shaking table tests

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