The Influence of Dampers on Earthquake Response of Tall Buildings

Gluck, J.; Ribakov, Yuri

doi:10.4203/csets.5.15

Cited by 4 publications

(8 citation statements)

References 17 publications

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“…As more devices are used, the cost of control becomes higher. Gluck and Ribakov , Constantinou et al . , and Ribakov et al .…”

Section: Effective Damper Locationsmentioning

confidence: 99%

“…Assuming that the bars' length is constant, the displacement d D , i , transferred to device through an amplifier at floor level, i , is

d_{D, i} = \frac{b_{i}^{*} - \sqrt{{(b_{i}^{*})}^{2} - 4 c_{i}^{*}}}{2}

where

{b_{i}}^{*} = 2 \sqrt{2} b_{i}

, c i * = 2 B st , i d i + d i 2 , B st is the story bay, h i is the story height, b i is the dimension of the square, and d i is the relative displacement at the i th floor.…”

Section: Effective Damper Locationsmentioning

confidence: 99%

“…where G feedb is the optimal feedback gain matrix, depending on damper distribution, defined by matrix B and performance index J, given in Eqn (2);d t ð Þ is the optimal estimation of the structure's state vec- Figure 1. Amplifier's scheme (following Gluck and Ribakov [25,27]). tor d(t), generated by Kalman filter algorithm using the floors' accelerations y m (t).…”

Section: Effective Damper Locationsmentioning

confidence: 99%

“…Connecting control devices to amplifiers increases the energy dissipation in each device and reduces the number of devices required to obtain optimal control. An efficient amplifying system (AS; Figure 1) that was proposed by Gluck and Ribakov [27] consists of a square frame (1), with bars connected by hinges (2a, 2b, 2c, and 2d), a system of bars or cables (3), and a damper (4). The AS can be used with different passive energy dissipators and semiactive and active control devices.…”

Section: Effective Damper Locationsmentioning

confidence: 99%

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Using a limited set of MR dampers for improving structural seismic response

Ribakov

Agranovich

2014

Struct. Control Health Monit.

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Summary Control is one of the methods used for reducing structural response to earthquakes. Optimal active control algorithms allow calculating the forces that should be applied by supplemental devices in order to yield desired structural behavior during an earthquake. However, active devices require large amounts of external power, which are not always available in the real time. Therefore, more economical semiactive devices, combining the best features of passive and active control systems, are used for protecting structures against earthquakes. This study is aimed at finding a simple and effective method for optimal control of structures using magnetorheological dampers. An algorithm for finding effective dampers' locations is used. Additionally, high‐efficiency amplifiers are used for connecting the dampers while decreasing the number of damping units. The location of dampers is found by simulating the structural response to a white noise ground motion. A number of equivalent damping units with amplifiers are obtained assuming equal energy dissipation at minimum amplifying ratio. The effectiveness and performance of the proposed method are further demonstrated by simulating the response of the structure to natural earthquake records. Copyright © 2014 John Wiley & Sons, Ltd.

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“…As more devices are used, the cost of control becomes higher. Gluck and Ribakov , Constantinou et al . , and Ribakov et al .…”

Section: Effective Damper Locationsmentioning

confidence: 99%

“…Assuming that the bars' length is constant, the displacement d D , i , transferred to device through an amplifier at floor level, i , is

d_{D, i} = \frac{b_{i}^{*} - \sqrt{{(b_{i}^{*})}^{2} - 4 c_{i}^{*}}}{2}

where

{b_{i}}^{*} = 2 \sqrt{2} b_{i}

, c i * = 2 B st , i d i + d i 2 , B st is the story bay, h i is the story height, b i is the dimension of the square, and d i is the relative displacement at the i th floor.…”

Section: Effective Damper Locationsmentioning

confidence: 99%

Section: Effective Damper Locationsmentioning

confidence: 99%

Section: Effective Damper Locationsmentioning

confidence: 99%

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Using a limited set of MR dampers for improving structural seismic response

Ribakov

Agranovich

2014

Struct. Control Health Monit.

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“…Another amplification system is the amplifying brace . This system has been shown to work well with a number of different supplemental damping devices . More recently, the displacement amplification device was developed .…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of seismically excited flexible truss tower with scissor-jack dampers

Walsh

Cronin

Rambo-Roddenberry

et al. 2011

Struct. Control Health Monit.

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SUMMARY In the proposed work, numerical simulations are conducted to investigate scissor‐jack dampers for controlling vibrations in a seismically excited flexible truss tower. For the scissor‐jack damper, new equations are developed to model the amplification factor that account for large deformations of the damper assembly. The equations are validated using computer‐aided design and are used to investigate the influence of vertical deformations on scissor‐jack damper amplification. Then, seismic analysis is carried out for scissor‐jack dampers installed on a 3D flexible truss tower. To reduce the computational effort, a bi‐model method is employed to represent the 3D truss tower as a dynamically equivalent 2D model. To describe the interaction between the structure and scissor‐jack dampers, the displacement‐dependent amplification factors of the scissor‐jack devices and the corresponding damper forces are calculated at each time step. The response of the tower with scissor‐jack damper systems is simulated for a range of damping and four major earthquakes and time histories of the displacement and absolute acceleration at each level of the tower are obtained. Results indicate that the system is effective in reducing both the displacement and absolute acceleration response of the tower without exceeding damper stroke capacity in most cases, but that damping level and earthquake intensity are important factors in the consideration of scissor‐jack dampers for flexible structures subject to seismic loads. Copyright © 2011 John Wiley & Sons, Ltd.

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Adaptive base-isolation of civil structures using variable amplification

Walsh

Abdullah

2006

Earthq. Engin. Engin. Vib.

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The Influence of Dampers on Earthquake Response of Tall Buildings

Cited by 4 publications

References 17 publications

Using a limited set of MR dampers for improving structural seismic response

Using a limited set of MR dampers for improving structural seismic response

Dynamic analysis of seismically excited flexible truss tower with scissor-jack dampers

Adaptive base-isolation of civil structures using variable amplification

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