Assessment of long-term behavior of tuned mass dampers by system identification

Weber, Benedikt; Feltrin, Glauco

doi:10.1016/j.engstruct.2010.08.011

Cited by 72 publications

(39 citation statements)

References 10 publications

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“…For leisure activities the dynamic response is fulfilled, however it was considered a tuned mass damper when the beam had a span length of 27.0 m. The high efficiency of the dampers in the reduction of the accelerations under a pedestrian walking is clearly seen in both panels. This reduction is very similar to the values obtained in [14].…”

Section: Figure 5: (A) Natural Frequencies (B) Maximum Vertical Accelsupporting

confidence: 79%

Dynamic Response of Girder Footbridges with Supplemental Damping

García-Troncoso¹,

Ruiz-Teran²,

Stafford³

2017

Footbridge 2017 Berlin - Tell a Story: Conference Proceedings 6-8.9.2017 TU-Berlin

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SummaryPedestrian-induced vibration commonly governs serviceability criteria in footbridge design. Simplified approaches to assess these vibrations have resulted in undesirable levels of vibration in built footbridges, highlighting the need to develop more realistic representations of the pedestrian loads as well as approaches to mitigate their effects. To represent these types of loads in an accurate manner it is necessary to consider the anthropometric characteristics (inter-subject variability), the inability that pedestrians have to transmit the same force in each step (intra-subject variability), the interaction between pedestrians and the lock-in effect. It has been observed that some footbridges have experiences serviceability problems due to vibrations with excessive magnitudes. In some of these cases, the human-induced vibration cannot be controlled effectively by using conventional approaches so the use of supplemental damping devices was required. Evaluation of the dynamic response at the design stage under the most realistic representation of pedestrian is crucial to satisfying the comfort criteria. After this evaluation, in cases where the comfort criteria is not fulfilled, an option available to designers is to employ supplemental damping devices to mitigate the pedestrian-induced vibrations. This work presents a parametric study showing the high efficiency of damping devices to mitigate human-induced vibrations in girder footbridges under diverse pedestrian loading scenarios.

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Section: Figure 5: (A) Natural Frequencies (B) Maximum Vertical Accelsupporting

confidence: 79%

Dynamic Response of Girder Footbridges with Supplemental Damping

García-Troncoso¹,

Ruiz-Teran²,

Stafford³

2017

Footbridge 2017 Berlin - Tell a Story: Conference Proceedings 6-8.9.2017 TU-Berlin

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“…Nevertheless, their numerical study was based on many simplifications, most notably their assumption of linearity of the soil's stress-strain behaviour. Furthermore, the efficiency with which TMDs operate in practice is often reduced considerably compared to theoretically developed responses [10]. In addition to these general drawbacks associated with theoretical studies that have been conducted on TMD performance, the bulk of such studies considered the long-established use of TMDs in windexcited structures, with the use of TMDs in seismically-excited structures being a relatively new concept that has not been as extensively explored [11,12].…”

Section: Introductionmentioning

confidence: 99%

Tuned mass damper effects on the response of multi-storied structures observed in geotechnical centrifuge tests

Jabary

Madabhushi

2015

Soil Dynamics and Earthquake Engineering

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a b s t r a c tTuned mass dampers (TMDs) are widely used to reduce vibrations in structures. However, very little research is available on the experimental investigation of TMDs and their performance in soil-structure systems. In this paper, a series of geotechnical centrifuge tests was conducted to investigate the effects of TMDs on the response of a multiple-storey sway frame structure undergoing dynamic soil-structure interaction (SSI). Structural responses were recorded for a wide range of input motion characteristics, damper configurations and soil profiles. The practicality associated with the use of TMDs in the damping of resonant structures in light of unexpected earthquake characteristics different from design earthquakes was experimentally demonstrated. Tuning a TMD to soil-structure system properties rather than fixed-base structural properties was found to double the improvement in damping and reduce the original peak response by nearly half. The potential effectiveness of a de-tuned mass damper in light of significant SSI was also demonstrated.

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“…However, studies have pointed out that passive devices are hard to adjust once they are installed and their robustness is questionable when the host structure is subjected to different excitations. Since TMD can only reduce vibration components whose frequencies are close to the tuned frequencies, it is believed that the most significant limitation of the TMD is its narrow effective bandwidth and the high sensitivity to even a small change in the tuning [7][8][9][10]. Thus, it is considered to be unsuitable for vibration control under broadband earthquake inputs [11].…”

Section: Introductionmentioning

confidence: 99%

PTMD Control on a Benchmark TV Tower under Earthquake and Wind Load Excitations

2017

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A pounding tuned mass damper (PTMD) is introduced by making use of the energy dissipated during impact. In the proposed PTMD, a viscoelastic layer is attached to an impact limitation collar so that energy can be further consumed and transferred to heat energy. An improved numerical model to simulate pounding force is proposed and verified through experimentation. The accuracy of the proposed model was validated against a traditional Hertz-based pounding model. A comparison showed that the improved model tends to have a better prediction of the peak pounding force. A simulation was then carried out by taking the benchmark Canton Tower, which is a super-tall structure, as the host structure. The dynamic responses of uncontrolled, TMD-controlled and PTMD controlled system were simulated under wind and earthquake excitations. Unlike traditional TMDs, which are sensitive to input excitations and the mass ratio, the proposed PTMD maintains a stable level of control efficiency when the structure is excited by different earthquake records and different intensities. Particularly, more improvement can be observed when an extreme earthquake is considered. The proposed PTMD was able to achieve similar, or even better, control effectiveness with a lower mass ratio. These results demonstrate the superior adaptability of the PTMD and its applicability for protection of a building against seismic activity. A parametric study was then performed to investigate the influence of the mass ratio and the gap value on the control efficiency. A comparison of results show that better control results will be guaranteed by optimization of the gap value.

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Assessment of long-term behavior of tuned mass dampers by system identification

Cited by 72 publications

References 10 publications

Dynamic Response of Girder Footbridges with Supplemental Damping

Dynamic Response of Girder Footbridges with Supplemental Damping

Tuned mass damper effects on the response of multi-storied structures observed in geotechnical centrifuge tests

PTMD Control on a Benchmark TV Tower under Earthquake and Wind Load Excitations

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