Vertical vibration control of suspension bridges subjected to earthquake by Semi-active MR dampers

Bahar, Arash; Pourzeynali, Saeid

doi:10.24200/sci.2017.2408

Cited by 4 publications

(4 citation statements)

References 24 publications

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“…Seismic control of the suspension bridge is crucial due to their complex dynamic properties, high flexibility and relatively low damping. It is believed that there is ample evidence for using MR dampers in suspension bridge to reduce the seismic responses (Pourzeynali et al, 2017;Heo et al, 2016). A lot of research into semi-active control algorithms have been done in this field.…”

Section: Semi-active Control Of Mr Damper For Bridge Response 41 Kinetic Model Of Mr Dampermentioning

confidence: 99%

Study of seismic-responses and semi-active control of Taizhou Bridge under multi-support excitation

Huang

Zhang

Wei

et al. 2021

IJSI

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PurposeIn order to make sure of the safety of a long-span suspension bridge under earthquake action, this paper aims to study the traveling wave effect of the bridge under multi-support excitation and optimize the semi-active control schemes based on magneto-rheological (MR) dampers considering reference index as well as economical efficiency.Design/methodology/approachThe finite element model of the long-span suspension bridge is established in MATLAB and ANSYS software, which includes different input currents and semi-active control conditions. Six apparent wave velocities are used to conduct non-linear time history analysis in order to consider the seismic response influence in primary members under traveling wave effect. The parameters α and β, which are key parameters of classical linear optimal control algorithm, are optimized and analyzed taking into account five different combinations to obtain the optimal control scheme.FindingsWhen the apparent wave velocity is relatively small, the influence on the structural response is oscillatory. Along with the increase of the apparent wave velocity, the structural response is gradually approaching the response under uniform excitation. Semi-active control strategy based on MR dampers not only restrains the top displacement of main towers and relative displacement between towers and girders, but also affects the control effect of internal forces. For classical linear optimal control algorithm, the values of two parameters (α and β) are 100 and 8 × 10–6 considering the optimal control effect and economical efficiency.Originality/valueThe emphasis of this study is the traveling wave effect of the triple-tower suspension bridge under multi-support excitation. Meanwhile, the optimized parameters of semi-active control schemes using MR dampers have been obtained, providing relevant references in improving the seismic performance of three-tower suspension bridge.

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Section: Semi-active Control Of Mr Damper For Bridge Response 41 Kinetic Model Of Mr Dampermentioning

confidence: 99%

Study of seismic-responses and semi-active control of Taizhou Bridge under multi-support excitation

Huang

Zhang

Wei

et al. 2021

IJSI

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“…While maintaining the geometric and dynamical properties of a passive damping system, a semiactive damper has been considered for incorporation in modern structure control to meet the requirements. In particular, semi-active damper offers desirable performance comparable to that brought by active structure control without requiring high power consumption and expensive hardware [8,9]. In the past decades, a kind of smart material, magnetorheological fluid (MRF), has been a preferred choice to make semi-active devices realistic.…”

Section: Introductionmentioning

confidence: 99%

Development and damping properties of a seismic linear motion damper with MR fluid porous composite rotary brake

Nakano

Yang

Sun

et al. 2020

Smart Mater. Struct.

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The particle sedimentation of the dispersed particles in magnetorheological (MR) fluids when off-working has been a challenging problem, causing adverse effect to their practical applications. In order to solve this problem, ‘MR fluid porous composite’ made of porous materials impregnated with MR fluid has been fabricated in this work. Its effect to prevent the particle sedimentation has been proved through contrast experiment. Its MR effect has also been measured and verified using a hand-made oscillatory rheometer. Utilizing the MR fluid porous composite, a small-scale seismic linear MR damper has been developed. The unique design of this seismic linear MR damper has enabled it to convert the linear motion (damping force) of the MR damper to the rotations (braking torque) of the MR brake with almost no transmission loss. The damping properties of the developed small-scale seismic MR damper were investigated experimentally to be found that the design target with the damping force to be 20 kN has been achieved when applying an electric current of 0.5 A. Then a theoretical model was derived to estimate the damping force. The simulation results demonstrate that the proposed model is good at describing the properties of the seismic linear MR damper.

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“…Several studies have focused on reducing the vibration of bridges subjected to external forces such as vehicles, railways, and earthquakes. Pourzeynali et al [12] proposed a TMD to reduce the vertical vibration of a suspension bridge subjected to an earthquake and derived the optimal values by studying the parameters of the TMD. Fiebig [13] applied a TMD to pedestrian bridges to reduce vibrations and reviewed the vibration control performance according to the theoretical formula.…”

Section: Introductionmentioning

confidence: 99%

“…Ok et al [22] proposed a semi-active fuzzy control algorithm for controlling MR dampers and compared the control performances of semi-active, active, and hybrid control algorithms for cable-stayed bridges. Pourzeynali et al [12] installed an MR damper diagonally between the tower and girder of a suspension bridge subjected to an earthquake and showed that the vibration was reduced in numerical simulations. Soto and Adeli [23] applied MR dampers to reduce the displacement of highway bridges during an earthquake and compared the results with passive, semiactive, and active controls.…”

Section: Introductionmentioning

confidence: 99%

Active Mass Damper for Reducing Wind and Earthquake Vibrations of a Long-Period Bridge

Chang

2020

Actuators

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An active mass damper (AMD) was developed that uses a linear motor and coil spring to reduce the vertical vibration of a long-period cable-stayed bridge subjected to wind and earthquake loads. A scaled-down bridge model and AMD were fabricated, and the control effect of the AMD was investigated experimentally and analytically. The AMD was controlled via a linear quadratic Gaussian algorithm, which combines a linear quadratic regulator and Kalman filter. The dynamic properties were investigated using a 1/10 scale indoor experimental model, and the results confirmed that the measured and analytical accelerations were consistent. A vibrator was used to simulate the wind-induced vibration, and the experimental and analytical results were consistent. The proposed AMD was confirmed to damp the free vibration and harmonic load and increase the damping ratio of the bridge model from 0.17% to 9.2%. Finally, the control performance of the proposed AMD was numerically investigated with the scaled-down bridge model subjected to the El Centro and Imperial Valley-02 earthquakes. These results were compared with those of a TMD, and they confirmed that the proposed AMD could reduce excessive vertical vibrations of long-period cable-stayed bridges subjected to wind and earthquakes.

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Vertical vibration control of suspension bridges subjected to earthquake by Semi-active MR dampers

Cited by 4 publications

References 24 publications

Study of seismic-responses and semi-active control of Taizhou Bridge under multi-support excitation

Study of seismic-responses and semi-active control of Taizhou Bridge under multi-support excitation

Development and damping properties of a seismic linear motion damper with MR fluid porous composite rotary brake

Active Mass Damper for Reducing Wind and Earthquake Vibrations of a Long-Period Bridge

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