Stiffness controllable isolation system for near-fault seismic isolation

Lu, Lyan Ywan; Lin, Guan-Bo; Kuo, Tzu Ching

doi:10.1016/j.engstruct.2007.05.022

Cited by 49 publications

(24 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, the semi-active control law proposed by Lu et al [36] for the control of a stiffness controllable isolation system is employed for the determination of k d (t) of the RVSD. Based on this control law, the target stiffnessk d (t) at a certain time instant is computed bŷ…”

Section: Control Of the Rvsd Dampermentioning

confidence: 99%

“…However, because these devices do not have resetting ability, the resistant force of a VSD device can only be in the same direction as the deformation of the device. In other words, the hysteresis loop produced by the VSD can only exist in the first and third quadrants of the hysteretic diagram (force-displacement diagram) of the VSD [36]; therefore, the energy dissipated by a VSD will be less than that of a RSASD, which has a hysteresis loop that covers all four quadrants [25,33].…”

Section: Introductionmentioning

confidence: 97%

“…This force discontinuity has a disadvantage of exciting a higher structural acceleration response, although the RSASD damper is shown to be very effective in suppressing the displacement response [22,25]. On the other hand, some researchers have developed variable stiffness devices (VSD) [14,35,36], whose stiffness can be altered continuously, in order to prevent discontinuous damper forces. However, because these devices do not have resetting ability, the resistant force of a VSD device can only be in the same direction as the deformation of the device.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improvement of near-fault seismic isolation using a resettable variable stiffness damper

Lin

2009

Engineering Structures

Self Cite

View full text Add to dashboard Cite

Section: Control Of the Rvsd Dampermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improvement of near-fault seismic isolation using a resettable variable stiffness damper

Lin

2009

Engineering Structures

Self Cite

View full text Add to dashboard Cite

“…It was shown that for cyclic loading, the super-elastic behavior of the alloy results in wide load-displacement loops, where a large amount of energy is dissipated. Lu et al (2008) studied a sliding base isolation system with controllable stiffness. They proposed to use a semi-active control method developed based on active feedback control to vary the stiffness of the isolation system.…”

Section: Introductionmentioning

confidence: 99%

Reduction of structural response to near fault earthquakes by seismic isolation columns and variable friction dampers

Ribakov

2010

Earthq. Engin. Engin. Vib.

View full text Add to dashboard Cite

This paper focuses on the investigation of a hybrid seismic isolation system with passive variable friction dampers for protection of structures against near fault earthquakes. The seismic isolation can be implemented by replacing the conventional columns fi xed to the foundations by seismic isolating ones. These columns allow horizontal displacement between the superstructure and the foundations and decouple the building from the damaging earthquake motion. As a result, the forces in the structural elements decrease and damage that may be caused to the building by the earthquake signifi cantly decreases. However, this positive effect is achieved on account of displacements occurring in the isolating columns. These displacements become very large when the structure is subjected to a strong earthquake. In this case, impact may occur between the parts of the isolating column yielding their damage or collapse. In order to limit the displacements in the isolating columns, it is proposed to add variable friction dampers. A method for selecting the dampers' properties is proposed. It is carried out using an artifi cial ground motion record and optimal active control algorithm. Numerical simulation of a sevenstory structure shows that the proposed method allows effi cient reduction in structural response and limits the displacements at the seismic isolating columns.

show abstract

“…A first example is the application of friction dampers in aircraft engines to reduce the blades vibration amplitudes [1]. Seismic isolation based on friction was proven be a very useful solution for large civil structures [2]. In most cases, friction dampers had been studied in a passive way, however, a significant improvement can be achieved by controlling the normal force in the dampers [3].…”

Section: Introductionmentioning

confidence: 99%

Control strategies for friction dampers: numerical assessment and experimental investigations.

Coelho

Santos

Neto

et al. 2014

MATEC Web of Conferences

View full text Add to dashboard Cite

Abstract. The use of friction dampers has been proposed in a wide variety of mechanical systems for which it is not possible to apply viscoelastic materials, fluid based dampers or others viscous dampers. An important example is the application of friction dampers in aircraft engines to reduce the blades vibration amplitudes. In most cases, friction dampers have been studied in a passive way, however, a significant improvement can be achieved by controlling the normal force in the dampers. The aim of this paper is to study three control strategies for friction dampers based on the hysteresis cycle. The first control strategy maximizes the energy removal in each harmonic oscillation cycle, by calculating the optimum normal force based on the last displacement peak. The second control strategy combines the first one with the maximum energy removal strategy used in the smart spring devices. Finally, is presented the strategy which homogenously modulates the friction force. Numerical studies were performed with these three strategies defining the performance metrics. The best control strategy was applied experimentally. The experimental test rig was fully identified and its parameters were used for the numerical simulations. The obtained results show the good performance for the friction damper and the selected strategy.

show abstract

Stiffness controllable isolation system for near-fault seismic isolation

Cited by 49 publications

References 24 publications

Improvement of near-fault seismic isolation using a resettable variable stiffness damper

Improvement of near-fault seismic isolation using a resettable variable stiffness damper

Reduction of structural response to near fault earthquakes by seismic isolation columns and variable friction dampers

Control strategies for friction dampers: numerical assessment and experimental investigations.

Contact Info

Product

Resources

About