Seismic Vibration Control of 3D Steel Frames with Irregular Plans Using Eccentrically Placed MR Dampers

Hu, Yuwen; Liu, Lingfei; Rahimi, Saeed

doi:10.3390/su9071255

Cited by 7 publications

(6 citation statements)

References 50 publications

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“…In recent years, many methods of vibration protection have been developed, including energy dispersion, vibration control, and base isolation [6][7][8]. In addition, studies on anti-vibration rubber bearings (HDRB) have been continuously carried out to increase the damping force of materials, and their probabilistic reliability has been studied [9][10][11][12][13]. Initial research on the rolling bearing seismic isolation system (RIS) was carried out by Lin and Hone in 1993 [14,15].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Behavior of a Simple Rolling Seismic Isolator with a Position Restoring Device

Hong

Hur

2018

Applied Sciences

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Herein, the behavior of a rolling type seismic isolation system with a position restoring device (PRD) is investigated, for alleviating problems such as rapid convergence and position restoration. The equation of motion is derived by modeling the behavior of the seismic isolation system, and the seismic characteristics according to the design variables of the PRD are investigated through numerical analysis. The vibration characteristics of the equation of motion show nonlinearity and depend on different variables. Numerical analysis was performed by using the fourth and fifth order Runge–Kutta method, and the vibration characteristics were analyzed with respect to the design parameters in the rolling type seismic isolation system with PRD, and compared to a model without PRD. In the model with PRD, numerical results show that the vibration suppression capability of the earthquake and the position restoration after disturbance are improved compared to those of the model without PRD. In addition, the rolling type seismic isolation system had nonlinear characteristics at specific frequencies, where the response increases suddenly and harmonics occur. This phenomenon can be controlled by the ratio of mass to stiffness and the damping coefficient, showing that the mount system can be designed to avoid resonance through optimal design.

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Section: Introductionmentioning

confidence: 99%

Dynamic Behavior of a Simple Rolling Seismic Isolator with a Position Restoring Device

Hong

Hur

2018

Applied Sciences

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“…The time-history responses provide a tool to understand the performance of any techniques during a seismic event [42]. Figure 11 shows the top floor displacement time-history in the x-, y-, and θ-directions for the Case-I building considering SSI under the Chi-Chi earthquake.…”

Section: Time-history Responsesmentioning

confidence: 99%

Swarm-based Parallel Control of Adjacent Irregular Buildings Considering Soil–structure Interaction

Azimi

Yeznabad

2020

JSAN

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Seismic behavior of tall buildings depends upon the dynamic characteristics of the structure, as well as the base soil properties. To consider these factors, the equations of motion for a multi-story 3D building are developed to include irregularity and soil–structure interaction (SSI). Inspired by swarm intelligence in nature, a new control method, known as swarm-based parallel control (SPC), is proposed in this study to improve the seismic performance and minimize the pounding hazards, by sharing response data among the adjacent buildings at each floor level, using a wireless-sensors network (WSN). The response of individual buildings is investigated under historic earthquake loads, and the efficiencies of each different control method are compared. To verify the effectiveness of the proposed method, the numerical example of a 15-story, 3D building is modeled, and the responses are mitigated, using semi-actively controlled magnetorheological (MR) dampers employing the proposed control algorithm and fuzzy logic control (FLC), as well as the passive-on/off methods. The main discussion of this paper is the efficiency of the proposed SPC over the independent FLC during an event where one building is damaged or uncontrolled, and an active control based upon the linear quadratic regulator (LQR) is considered for the purpose of having a benchmark ideal result. Results indicate that in case of failure in the control system, as well as the damage in the structural elements, the proposed method can sense the damage in the building, and update the control forces in the other adjacent buildings, using the modified FLC, so as to avoid pounding by minimizing the responses.

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“…If the charge motion on conductive surface is ignored, the electric current density J can be written as [15]:…”

Section: Mechanical Model Of Adaptive-passive Ectmdmentioning

confidence: 99%

“…The vertical TMD is usually used in controlling human-induced vibration of footbridges and large-span floors [7][8][9][10][11][12], and the pendulum TMD is usually used in controlling wind-induced vibration of tall buildings [13]. However, a viscous damper is mostly used as the damping element of TMD, which would lead to some unsustainable problems [14,15]. Firstly, it has poor durability; the damping ratio may be changed as time going by and it is sensitive to the change of temperature.…”

Section: Introductionmentioning

confidence: 99%

Study on Adaptive-Passive and Semi-Active Eddy Current Tuned Mass Damper with Variable Damping

et al. 2018

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Tuned mass damper (TMD) is a widely used vibration control device, consisting of a mass, some springs and damping elements. Viscous damper is mostly used as a damping element; however, it has many unsustainable problems, e.g., poor durability, sensitive to the change of temperature, difficult to adjust the damping, oil leakage etc. In this paper, a new sustainable adaptive-passive eddy current tuned mass damper (ECTMD) with variable damping, which is very easy to be further upgraded to a semi-active one, is proposed. Four important parameters, e.g., adsorption position of permanent magnets, thickness of the conductive plate, thickness of the extra steel plate and the air gap between permanent magnets and the conductive plate are investigated by a parametric study. Two new evaluation indexes are put forward to indicate the damping mechanism of the proposed device. The relationship between effective damping coefficient and air gap is fitted through a quadratic function. Then, the corresponding design method of the proposed adaptive-passive ECTMD is presented. At last, the previous adaptive-passive ECTMD is upgraded to a semi-active one, which can adjust its eddy current damping through adjusting its air gap in real-time, based on the linear-quadratic-Gaussian algorithm. The effectiveness of semi-active ECTMD is evaluated through harmonic excitations and human-induced excitations. The results show that the semi-active ECTMD with variable damping has a better vibration control effect than the optimized passive one.

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Seismic Vibration Control of 3D Steel Frames with Irregular Plans Using Eccentrically Placed MR Dampers

Cited by 7 publications

References 50 publications

Dynamic Behavior of a Simple Rolling Seismic Isolator with a Position Restoring Device

Dynamic Behavior of a Simple Rolling Seismic Isolator with a Position Restoring Device

Swarm-based Parallel Control of Adjacent Irregular Buildings Considering Soil–structure Interaction

Study on Adaptive-Passive and Semi-Active Eddy Current Tuned Mass Damper with Variable Damping

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