Characterization of a novel variable friction connection for semiactive cladding system

Gong, Yongqiang; Cao, Liang; Laflamme, Simon; Quiel, Spencer E.; Ricles, James M.; Taylor, Dane

doi:10.1002/stc.2157

Cited by 10 publications

(32 citation statements)

References 37 publications

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“…Variable friction has been widely studied in structural control with devices leveraging electromechanical- [49,50], electromagnetic- [51,52], magnetorheological- [53,54], hydraulic- [41,55], and piezoelectric- [56,57] based actuation. Prior work on the VFCC consisted of prototyping and characterizing the device [58], and developing an MBD methodology for blast [59] and wind [60] mitigation.…”

Section: Goodno Andmentioning

confidence: 99%

“…Fig. 1(b) provides a picture of a prototype used in the characterization of its friction mechanism, published previously by the authors [58]. In this prototype, the actuator stroke was emulated using spacers that maintained a constant displacement between toggles, and the VFCC was mounted in an aluminum frame for testing.…”

Section: Variable Friction Cladding Connectionmentioning

confidence: 99%

“…From prior work conducted on the VFCC in a laboratory environment [58], a LuGre friction model can be used to characterize the dynamic friction force F f…”

Section: Variable Friction Cladding Connectionmentioning

confidence: 99%

“…with g n (λ) = b 0 λ 2n−2 + b 1 λ 2n−4 + ... + b n−1 (58) and h n (x) = a 0 λ n + a 1 λ n−1 + ... + a n (59) its analytical solution follows [79] J = jπQ n a 0 V n (60) where j is the imaginary unit, and V n and Q n are the determinants of the following matrices 61, the analytical solution for J ci can be expressed in terms of the determinants of matrices V n and Q n using Eq. 60.…”

Section: Appendix I Closed-form Expression For the Integral Of Rationmentioning

confidence: 99%

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Variable friction cladding connection for seismic mitigation

Gong

Cao

Laflamme

et al. 2019

Engineering Structures

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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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Section: Goodno Andmentioning

confidence: 99%

Section: Variable Friction Cladding Connectionmentioning

confidence: 99%

“…From prior work conducted on the VFCC in a laboratory environment [58], a LuGre friction model can be used to characterize the dynamic friction force F f…”

Section: Variable Friction Cladding Connectionmentioning

confidence: 99%

Section: Appendix I Closed-form Expression For the Integral Of Rationmentioning

confidence: 99%

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Variable friction cladding connection for seismic mitigation

Gong

Cao

Laflamme

et al. 2019

Engineering Structures

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“…Since the first passive vibration absorb device was invented by Frahmin in 1911, a variety of such devices have been developed and widely used in civil, mechanical, and aerospace engineering areas . Most of them are linear vibration absorbers that consist of a linear mass‐spring system and a damper.…”

Section: Introductionmentioning

confidence: 99%

Optimization design and experimental verification of track nonlinear energy sink for vibration control under seismic excitation

Lü

Zhongpo

2017

Struct Control Health Monit

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Nonlinear energy sinks (NES) are efficient vibration control devices, which have been studied and applied in mechanical, automobile, and aerospace engineering.However, there are few applications in civil engineering. A new type of NES, which is termed as track NES, is proposed in this paper. The optimal mass ratio and track shape expression of NES were determined based on a preliminary optimization design process. To verify its vibration control effects on building structures, a series of shake table tests were conducted on a five-story steel frame. Tracks of the NES were installed at the roof of the frame with rigid connections and the mass of the NES was constrained to slide along the track by using wheels. Five earthquake waves with different frequency spectrums were selected to excite the frame coupled with NES under minor, moderate, and major levels. Accelerations and displacements on each story of the frame were measured, recorded, and evaluated. The experimental results demonstrate that with small mass ratio (2%) of main structure, NES has good performance in reducing the dynamic responses of the frame under seismic excitations. The reduction ratio for peak response is up to 50%, while for root mean square response is up to 80%. NES also exhibits wide-band frequency vibration controlling attributes, and the responses of the frame are reduced in multiple vibration modes. In addition, the vibration reduction capability of the NES with steel wheels and that with rubber wheels are compared, and it is verified that different damping of NES makes a difference to the vibration control effects. The displacement reduction performance is not sensitive to the damping factor of the NES, but acceleration response is highly affected by the damping feature of the NES.

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Energy response of a passive variable friction damper and numerical simulation on the control effects for high‐rise buildings

Shirai

Sano

Suzui

2022

Structural Contr & Hlth

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In this study, the behavior of a passive displacement-dependent variable friction damper (VFD) was evaluated. The energy response behavior of a VFD specimen was investigated by conducting full-scale dynamic loading tests.Full-scale tests demonstrated that the VFD specimen produced a lower sliding force when the device response exceeded a predetermined displacement, resulting in a decreased dissipated energy ratio as the displacement increased.The VFD specimen exhibited stable energy response behavior as well as a stable friction sliding force and friction coefficient under sinusoidal, seismic response, and 100-cycle loadings. The energy response of the VFD specimen was almost independent of the loading frequency. Moreover, a response simulation was conducted using a two-dimensional 30-story nonlinear mainframe model with brace-type VFDs under various input motions, including observation records and long-period, long-duration waves. From the numerical simulations, the peak story drift in the case with brace-type VFDs was not significantly greater than in the case with conventional friction dampers (FDs).The dissipated energy ratios of the mainframe and dampers in the case with the VFDs were approximately identical to those in the case with the FDs. In comparison with conventional FDs, VFDs can produce a lower peak story shear force and axial compressive force in the lowest-story columns at the device installation span.

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Characterization of a novel variable friction connection for semiactive cladding system

Cited by 10 publications

References 37 publications

Variable friction cladding connection for seismic mitigation

Variable friction cladding connection for seismic mitigation

Optimization design and experimental verification of track nonlinear energy sink for vibration control under seismic excitation

Energy response of a passive variable friction damper and numerical simulation on the control effects for high‐rise buildings

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