Optimal design of double-skin façades as vibration absorbers

Cladding systems are conventionally designed to serve an architectural purpose and provide environmental protection for building occupants. Recent research has been conducted to enhance structural resiliency by leveraging cladding systems against man-made and natural hazards. The vast majority of the work includes the use of sacrificial cladding panels and energy dissipating connectors. These passive protection systems, though effective, have typically targeted a single hazard one-at-a-time because of their limited frequency bandwidths. A novel semi-active friction connection has been previously proposed by the authors to leverage the cladding motion for mitigating blast and wind hazards. This semi-active friction device, termed variable friction cladding connection (VFCC), is designed to laterally connect cladding elements to the structural system and dissipate energy via friction. Its variable friction force is generated onto the sliding friction plates upon which a variable normal force is applied via actuated toggles. Because of its semi-active capabilities, the VFCC could be used over wide-band excitation frequencies and is thereby, an ideal candidate for multiple hazard mitigation. The VFCC in its passive in situ mode has been previously designed to mitigate air-blast effects towards the structure and its semi-active scheme has been applied to wind hazard mitigation. In this paper, a motion-based design (MBD) procedure is developed to apply the VFCC to seismic hazard mitigation, completing its application against multiple hazards. The MBD procedure begins with the quantification of seismic load and performance objectives, and afterwards, dynamic parameters of the cladding connection are selected based on non-dimensional analytical solutions. Simulations are conducted on two example buildings to verify and demonstrate the motion-based design methodology. Results show the semi-actively controlled VFCC is capable of mitigating the seismic vibrations of structures, demonstrating the promise of the semiactive cladding system for field applications.

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“…Examples can be found in Refs. [33,34,35] where double skin facade systems are utilized as multiple tuned mass damper systems.…”

Section: Goodno Andmentioning

confidence: 99%

Variable friction cladding connection for seismic mitigation

Gong

Cao

Laflamme

et al. 2019

Engineering Structures

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“…Moon [22,23] studied the structural capacities of the double-skin facade (DSF) systems in tall buildings with fixed base subjected to dynamic wind loads. Furthermore, Pipitone et al [24] employed several layouts of double-skin facade (DSF) with mass dampers to reduce the seismic vibration in structures subjected to variety of earthquake excitations.…”

Section: Introductionmentioning

confidence: 99%

Seismic Performance Evaluation of Double‐Skin Semi‐Base‐Isolated Building Using Incremental Dynamic Analysis

Parsaeimaram

Fang

Luo

et al. 2018

Advances in Civil Engineering

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Base isolation is a widely accepted earthquake damage prevention technique. is method decouples the superstructure from the base by putting a flexible layer under each column, thereby elongating the time period of structures. Semi-base isolation (SBI) in double-skin structures is an effective technique to reduce the dynamic responses of structures due to earthquake motions, by utilizing the isolation devices in part of it instead of the entire base. is study presents a double-skin structure consisting of outer fixed base frames with shear walls that have been detached from the inner core with a minor gap. e inner core of the structure has been dissociated from the base using the elastomeric bearings. Seismic response of 10-story double-skin structure with inner isolated core was compared to that of inner fixed base core to consider the yielding and collapse probability of the structure using the incremental dynamic analyses (IDA). e results showed that the time period in SBI buildings can be adjusted with the use of coupling beams between the inner and outer frames. Also, the time period and interstory drift ratio are both reduced as more floors are given coupling beams. However, these coupling beams are the most effective at the topmost floors.

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“…As in the case of the existing building, all the modes of vibration have been used ( m j =3 n S ) to build the matrices of inherent damping c ( j ) (with j =1,2,3), assuming the same modal viscous damping ratio ζ ( j ) =0.05. It is worth noting here that the coefficients M (0) / M ( j ) =15, J (0) / J ( j ) =800 and K (3) / K (1) =1.5 have been assumed based on preliminary design considerations on the individual reaction towers and the feasibility of the intervention; these values could be potentially subjected to further optimization through appropriate heuristic search methods (eg, genetic algorithms and particle swarm optimization, as in Palmeri et al and Pipitone et al), but this beyond the scope of the present study.…”

Section: Case Studymentioning

confidence: 99%

Seismic performance of buildings retrofitted with nonlinear viscous dampers and adjacent reaction towers

Impollonia

Palmeri

2018

Earthq Engng Struct Dyn

Self Cite

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Summary An effective strategy of seismic retrofitting consists of installing nonlinear viscous dampers between the existing building, with insufficient lateral resistance, and some auxiliary towers, specially designed and erected as reaction structures. This allows improving the seismic performance of the existing building without any major alteration to its structural and nonstructural elements, which makes this approach particularly appealing for buildings with heritage value. In this paper, the nonlinear governing equations of the coupled lateral‐torsional seismic motion are derived from first principles for the general case of a multistory building connected at various locations in plan and in elevation to an arbitrary number of multistory towers. This formulation is then used to assess the performance of the proposed retrofitting strategy for a real case study, namely, a 5‐story student hall of residence in the city of Messina, Italy. The results of extensive time‐history analyses highlight the key design considerations associated with the stiffness of the reaction towers and the mechanical parameters of the nonlinear viscous dampers, confirming the validity of this approach.

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Optimal design of double-skin façades as vibration absorbers

Cited by 23 publications

References 25 publications

Variable friction cladding connection for seismic mitigation

Variable friction cladding connection for seismic mitigation

Seismic Performance Evaluation of Double‐Skin Semi‐Base‐Isolated Building Using Incremental Dynamic Analysis

Seismic performance of buildings retrofitted with nonlinear viscous dampers and adjacent reaction towers

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