Hybrid Tuned Mass Damper and Isolation Floor Slab System Optimized for Vibration Control

Engle, Travis; Mahmoud, Hussam; Chulahwat, Akshat

doi:10.1080/13632469.2015.1037406

Cited by 41 publications

(25 citation statements)

References 20 publications

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“…In Engle et al (2015), a new sliding floor isolation system was proposed to overcome the needed limitations of TMD systems, and its performance was evaluated against traditional composite systems under seismic loading. The proposed system comprises of isolated floor slabs that are free to move relative to the frame.…”

Section: System Descriptionmentioning

confidence: 99%

“…The system of equations was solved using a combination of modal analysis and Newmark numerical integration (Newmark 1959) to obtain the respective response equations. The derivation of the equations has been described in detail in Engle et al (2015): …”

Section: System Of Equationsmentioning

confidence: 99%

“…Idealized representation of multistory sliding floor system (Engle et al 2015) 2 6 6 6 6 6 6 6 6 6 6 6 4…”

Section: System Of Equationsmentioning

confidence: 99%

“…The S n parameters define the floor level at which the slabs should be suspended. The most optimal performance of the sliding system might require not all slabs to be isolated on all floors (Engle et al 2015;Mahmoud and Chulahwat 2015); therefore, the location parameter "S n " is introduced to indicate the presence or absence of isolated slabs on a given floor as it takes only binary values, i.e., 0 (absence) or 1 (presence). The location parameter regulates the parameter values as shown in Eq.…”

Section: Key Parametersmentioning

confidence: 99%

“…The nested CMA-ES framework discussed in this study was also used in Engle et al (2015) but for optimization against earthquake hazards only. In order to utilize the optimization for both earthquake and wind loading, some modifications were made to increase the performance of CMA-ES.…”

Section: Modificationsmentioning

confidence: 99%

See 4 more Smart Citations

Multi-hazard Approaches to Civil Infrastructure Engineering

Gardoni¹,

LaFave²

2016

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Section: System Descriptionmentioning

confidence: 99%

Section: System Of Equationsmentioning

confidence: 99%

“…Idealized representation of multistory sliding floor system (Engle et al 2015) 2 6 6 6 6 6 6 6 6 6 6 6 4…”

Section: System Of Equationsmentioning

confidence: 99%

Section: Key Parametersmentioning

confidence: 99%

Section: Modificationsmentioning

confidence: 99%

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Multi-hazard Approaches to Civil Infrastructure Engineering

Gardoni¹,

LaFave²

2016

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Steel frame with aseismic floor: From the viscoelastic decoupler model to the elastic structural response

Xiang

Koetaka

Nishira

2021

Earthq Engng Struct Dyn

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By installing laminated viscoelastic materials (LVEM) between floor slabs and steel beams, the lateral motions of the floor and the frame are decoupled and the structural seismic response is mitigated. This paper presents a study of the elastic seismic performance of the steel frame with this floor system (hereafter termed the aseismic floor). First, the dynamic model of an LVEM under the combined precompression (vertical) and shear (lateral) is checked by experiment. The dynamic shearing behavior of the precompressed LVEM could be well simulated by the pure‐shear model (without precompression) using the modified shear area‐to‐thickness ratio. The storage modulus and the loss factor of the precompressed LVEM could be deemed the same as those without precompression. Second, the time‐varying dynamic properties of LVEM during the seismic response history are processed. In the processing, the transient frequency of LVEM is assumed to be equal to the fundamental frequency of the accordant conventional frame, and the dynamic property of the structure equipped with the aseismic floor is assumed stable throughout the response history. The accuracy of the processing is validated via numerical analyses. Third, based on the processed structural dynamic properties, the effectiveness of a complex Complete‐Quadratic‐Combination (CQC) method for predicting the peak structural seismic response is checked. The CQC method is recalibrated to account for the deviation between the pseudo‐ and relative velocities of the modal oscillators. The recalibrated CQC method could well predict the interstory drift of the frame and the shear deformation of the LVEM.

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Analysis and optimization of a nonlinear dual‐mode floor isolation system subjected to earthquake excitations

Bin

Tehrani

Nisa

et al. 2021

Earthq Engng Struct Dyn

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Floor isolation systems (FISs) are used to mitigate earthquake‐induced damage to sensitive building contents. Dynamic coupling between the FIS and primary structure (PS) may be nonnegligible or even advantageous when strong nonlinearities are present under large isolator displacements. This study investigates the influence of dynamic coupling between the PS and FIS in the presence of nonsmooth (impact‐like) nonlinearity in the FIS under intense earthquakes. Using component mode analysis, a nonlinear reduced order model of the combined FIS–PS system is developed by coupling a condensed model of the linear PS to the nonlinear FIS. A bilinear Hertz‐type contact model is assumed for the FIS, with the gap and the impact stiffness and damping providing parametric variation. The performance of the FIS–PS system is quantified through a multiobjective, risk‐based design criterion considering both the total acceleration sustained by the isolated mass under a service‐level earthquake and the interstory drift under a maximum considered earthquake. The results of a parametric study shed light on understanding the valid range that the decoupled approach can be reliably applied for nonlinear FISs experiencing impacts. It is also shown that the nonlinear FIS can be tuned in such a way to mitigate seismic responses of the supporting PS under strong shaking, in addition to protecting the isolated mass at low to moderate shaking. The FIS, therefore, functions as a dual‐mode vibration isolator/absorber system, with displacement‐dependent response adaptation. Guidelines to the optimal tuning of such a dual‐mode system are presented based on the risk‐based stochastic design optimization.

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Hybrid Tuned Mass Damper and Isolation Floor Slab System Optimized for Vibration Control

Cited by 41 publications

References 20 publications

Multi-hazard Approaches to Civil Infrastructure Engineering

Multi-hazard Approaches to Civil Infrastructure Engineering

Steel frame with aseismic floor: From the viscoelastic decoupler model to the elastic structural response

Analysis and optimization of a nonlinear dual‐mode floor isolation system subjected to earthquake excitations

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