Coupling beam is a very important component in shear wall structure. However, the reinforced concrete coupling beam does not have an efficient energy dissipation capacity and a stable hysteretic behavior. A new type energy-dissipating coupling beam is proposed in the paper, which has a large energy dissipation capacity and a stable hysteretic behavior. It can be constructed and repaired easily. Models with different shapes were established in a Finite Element Analysis program to simulate the performance of the damper. The hysteretic behaviors of the damper were also numerical analyzed.
Viscoelastic dampers are one of popular vibration mitigation devices applied to tall buildings to reduce seismic and wind-induced vibiration. In this paper,a new kind of viscoelastic-wall damper, which could be installed at the shearwall location of high-rising buildings, is proposed to enhance the energy disspation ability. The seismic resistance behaviors of one tall building installed with the viscoelastic-wall dampers are investigated by numerical analysis. The mechanical property testing of the viscoelastic-wall damper is carried to investigate its performance parameter under various exciting frequency and strain amplitude. According to the testing results, a mathematical model of viscoelastic - wall damper is modeled based on Kelvin model. On the basis of a 36-floor frame-shear wall structure and using the finite element software ABAQUS, two finite element models of the high-rising building with and without viscoelastic-wall dampers are set up. Elasto-plastic time-history analysis is used to compare the seismic performance of the two structures subjected to the frequently and rarely earthquakes. It is proved that the seismic response of the structure is mitigated effectively when it is equipped with viscoelastic-wall dampers.
KEYWORDS: Vibration control, Performance modeling, Control systems, Amplifiers, Sensors, Data modeling, Numerical simulations, Actuators, Systems modeling, Control systems design
Control-structure interaction (CSI) during structural vibration control system has been investigated in some current literatures. However, the interaction between MR damper and flexible stay cable has not been reported. In this paper, experimental investigation on vibration control is carried out on a stay cable model incorporated with one small size magneto-rheological (MR) fluid damper taking into account the interaction effect of the stay cable and the MR damper. Experiments on the vibration control of the stay cable model attached with the MR damper with different constant current input indicates the obvious interaction between the stay cable and the MR damper. A novel model of MR damper with constant current input coupled with stay cable is proposed to better predict the MR damper’s behavior considering the interaction effect between the stay cable and the MR damper. The proposed coupling model is validated by the numerical simulations using the experimental results.
KEYWORDS: Numerical analysis, Commercial off the shelf technology, Civil engineering, Bridges, Vibration control, Differential equations, Smart structures, System integration, Current controlled current source, Atrial fibrillation
The present paper derivate the asymptotic solution of modal damping of one taut stay cable attached with one passive damper including damper stiffness and viscous damping. The effect of the damper stiffness on the modal damping of the stay cable-passive system was analytical investigated. On the basis of the asymptotic solution of modal damping of one stay cable attached with one passive damper with the effect of cable stiffness and by using the decay factor of damper stiffness and the decay factor of cable sag, maximum modal damping ratio and corresponding optimal damping coefficient, which indicates the relationships of the characteristics of the damper and the cable sag was theoretically analyzed. Numerical analysis of parameters on the effect of dynamic performance of the controlled stay cable was conducted.
In this paper, experimental investigation on vibration control is carried out on a stay cable model incorporated with one
small size magnetorheological fluid (MR) damper. The control efficiency of the MR dampers to reduce the cable
vibration under sinusoidal excitation using passive control strategy is firstly tested. The dynamic coupling between the
cable and MR damper with the passive control strategy is obviously observed. Dynamic coupling models between stay
cable and MR damper with constant and fluctuating current input are proposed respectively. The proposed dynamic
coupling model corresponding to the MR damper with constant current input is validated by the numerical simulations of
the measured experimental data. Furthermore, using the proposed dynamic coupling corresponding to the MR damper
with fluctuating current input, experimental investigation on the cable vibration control subjected to sinusoidal excitation
using semi-active control strategy is then conducted. Experimental results demonstrate that the semi-active MR damper
can achieve much better mitigation efficacy than the passive MR dampers with different constant current inputs due to
negative stiffness provided by the semi-active MR damper.
KEYWORDS: Vibration control, Systems modeling, Signal processing, Digital signal processing, Control systems, Bridges, Power supplies, Feedback control, Process control, System identification
In this paper, a simple non-model based control strategy is developed to control stay cable vibration using MR dampers. The strategy
is an integral plus double integral control based on the collocated accelerometer feedback. To experimentally study this control
method, a model stay cable equipped with an Magneto-Rheological(MR) damper is used in this study. To demonstrate the
effectiveness of the proposed controller, comparisons of the unimpeded stay cable, passive off, passive on and the proposed integral plus double integral control are conducted. For each case, the damping ratio of the stay cable vibration is calculated. Comparisons of the experimental results show that non-model based vibration control of the stay cable using the MR damper is most effective in reducing the stay cable vibration.
An experimental study on vibration control of one stay cable using a magnetorheological fluid (MR) damper is described in the paper. A 14m-long stay cable model, which is a 1:16 scale model of a 220m-long prototype stay cable in the actual structure, is established for the experimental investigation.The planar sinusoidal excitations with the resonant frequencies are generated by the exciter installed perpendicular to the stay cable model at a point near the low anchorage. The modal testing on the unimpeded stay cable is first performed to identify the actual modal properties and the dynamic performances. Then a series of vibration control tests are conducted on the stay cable incorporated with a small-size MR damper near the low anchorage under the sinusoidal excitations with the first two modal resonant frequencies. The control efficacies and the dynamic performances of the combined cable/MR damper system corresponding to the different current inputs to the MR damper and the semi-active MR damper are investigated comparatively. The experimental results of the vibration control of the stay cable model indicate that the semi-active MR damper can achieve much better control efficacy than the passive MR dampers supplied with constant currents, and the reason can be attributed to the pseudo-negative stiffness generated by the semi-active MR damper.
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