Control of pedestrian-induced vibrations of long-span bridges

Reiterer, Michael; Ziegler, Franz

doi:10.1002/stc.91

Cited by 44 publications

(37 citation statements)

References 6 publications

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“…For each absorber, a tuning frequency slightly below the structural frequency, and an initial damping ratio dependent on the modal mass ratio μ * , is obtained from the analogy, see Eq. (17). However, in case of coupled TLCGD, the tuning frequencies obtained from the analogy must be in accordance with the natural frequencies of coupled absorber systems defined by Eq.…”

Section: Optimization and Fine-tuning Of Tlcgd Systems In State Spacementioning

confidence: 94%

“…Possible applications include, among others, base-excited asymmetric high-rise buildings, wind, traffic or earthquake-induced bending torsional vibrations of bridges and base-isolated systems. Temporary mobile TLCD units may be used in case of vibration-prone construction processes of bridges and other structures as well [9,17]. Real size installations have also been reported, e.g., a TLCD installation in a 26-story, 106-m high hotel in Japan [18], or the 48-story One Wall Center in Vancouver, Canada [19].…”

Section: Introductionmentioning

confidence: 99%

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Design of coupled tuned liquid column gas dampers for multi-mode reduction in vibrating structures

Hochrainer

Fotiu

2017

Acta Mech

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Tuned liquid column gas dampers (TLCGD) show excellent energy and vibration absorbing capabilities appropriate for earthquake engineering. The objective of this work is to introduce a new concept of coupled tuned liquid column gas dampers which allow an extended field of applications. In the proposed configuration, several absorbers are connected in a spatial chain generating a multi-degree of freedom damper system which can be tuned to a selected number of structural modes. Because all absorbers vibrate at different natural frequencies simultaneously, the proposed design represents an improvement over conventional TLCGD which can only be tuned to a single structural mode. Another benefit of multi-mode tuning is the significant increase in active liquid mass compared to other damping devices. For a most effective vibration reduction, a numerical tuning process in state space will deliver the free system natural frequency and damping ratio of all absorbers. The capabilities of the new damping device are demonstrated on a simple laboratory structure that is investigated numerically and experimentally. The results illustrate the excellent energy dissipating properties of the proposed setup and emphasize the adequacy of coupled TLGCD for base-isolated structures. A notable benefit of such types of dampers lies in their lack of moving mechanical parts, their cheap and easy implementation into civil engineering structures and low maintenance costs. Possible modifications with respect to natural frequency and even of the damping properties can be performed with little additional expenses, and the additional weight due to the liquid mass may be used as a possible reservoir, e.g., for fire fighting. Apart from that, they exhibit a performance that is comparable to tuned mass dampers.

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Section: Optimization and Fine-tuning Of Tlcgd Systems In State Spacementioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Design of coupled tuned liquid column gas dampers for multi-mode reduction in vibrating structures

Hochrainer

Fotiu

2017

Acta Mech

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“…Therefore, the geometric factors are expected to effect the efficiency of the damper depending on . The first geometric factor 1 scales the acceleration of the structureẍ, as given in the equation of motion of the S-TLCD in Equation 31. Accordingly, together with the acceleration x of the structure, an increase in the geometric factor 1 amplifies the liquid motion amplitude u.…”

Section: Geometric Factorsmentioning

confidence: 99%

A semi-active tuned liquid column damper for lateral vibration control of high-rise structures: Theory and experimental verification

Altay

Klinkel

2018

Struct Control Health Monit

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This paper presents a new type of semi-active tuned liquid column damper (S-TLCD) for the lateral vibration control of high-rise civil engineering structures. Analogous to the passive tuned liquid column damper (TLCD), the S-TLCD comprises a U-shaped tank consisting of two vertical columns, which are arranged at a distance from each other and communicating through a horizontal passage. The tank is partially filled with a Newtonian fluid until the liquid reaches a certain level in the columns. In contrast to the passive TLCD, the S-TLCD provides also mechanisms for a continuous adaptation of both its natural frequency and damping behaviour in real time. In the first part of the paper, the governing equations of the S-TLCD are derived on the basis of the Bernoulli equation of a nonstationary incompressible liquid flow. The natural frequency of the S-TLCD is revealed to depend on the scaled length of the liquid. The scaling amount of the liquid length is formulated in dependence of the cross-sectional area ratios of the tank segments. The mathematical description of the S-TLCD is concluded by providing the state-space representation of a multi-degree-of-freedom structure with several S-TLCDs. In the second part of the paper, the derived natural frequency equation is verified, and the proof of concept of the S-TLCD is shown by experimental investigations, which are performed on an S-TLCD model utilizing a test structure and shaking table tests. KEYWORDS adaptive stiffness, adaptive damping, high-rise structures, lateral vibrations, natural frequency tuning, semi-active tuned liquid column dampers Struct Control Health Monit. 2018;25:e2270.wileyonlinelibrary.com/journal/stc

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“…In contrast to previous studies on grandstands with HSI, this paper proposes a novel semi‐active pressurized tuned liquid column damper (PTLCD) for the control of vibrations and includes an experimental validation of the system. PTLCDs are one of the most versatile types of semi‐active DVAs and consist of a sealed U‐tube‐like column of water with an air chamber at each end . These devices can be tuned to a wide range of structural frequencies, in contrast to the classical TLCD .…”

Section: Introductionmentioning

confidence: 99%

Structural control of a grandstand using a semi‐active pressurized tuned liquid column damper considering effects of passive crowds

Riascos

Marulanda

Thomson

2019

Struct Control Health Monit

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Summary Varying passive crowds can cause considerable changes in the dynamic properties of civil structures, such as sport venues. The effectiveness of passive control systems for the reduction of vibrations in these structures is limited as the dynamic properties of the structure change depending on the occupancy level and postures. Hence, a semi‐active system is proposed for reducing structural vibrations regardless of the off‐tuning due to passive crowd effects. This paper describes the experimental implementation of a semi‐active control strategy for a pressurized tuned liquid column damper (PTLCD) on a grandstand‐type steel structure. Additionally, an analytical model is proposed for the human–structure–damper system, and numerical results are compared with those obtained experimentally. Only the effects of passive anthropic behavior were considered, and results show that individuals, when sitting, produce more damping in the main structure than when they are standing. Overall, the semi‐active PTLCD had a satisfactory performance for the different configurations considered, achieving reductions in peak and root mean square acceleration of up to 74% and 57% with respect to the grandstand without the control system.

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Control of pedestrian-induced vibrations of long-span bridges

Cited by 44 publications

References 6 publications

Design of coupled tuned liquid column gas dampers for multi-mode reduction in vibrating structures

Design of coupled tuned liquid column gas dampers for multi-mode reduction in vibrating structures

A semi-active tuned liquid column damper for lateral vibration control of high-rise structures: Theory and experimental verification

Structural control of a grandstand using a semi‐active pressurized tuned liquid column damper considering effects of passive crowds

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