Experimental studies on seismic performance of three-storey steel moment resisting frame model with scissor-jack-magnetorheological damper energy dissipation systems

Raju, K. Rama; Jame, A.; Gopalakrishnan, N.; Muthumani, K.; Iyer, Nagesh R.

doi:10.1002/stc.1598

Cited by 8 publications

(7 citation statements)

References 9 publications

(22 reference statements)

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“…Rama Raju et al . have tested a three‐storey quarter‐length‐scale steel moment resisting frame with two scissor‐jack‐MR damper systems placed at the ground floor. It was found that the scissor‐jack‐MR damper systems are effective in improving the performance of the building.…”

Section: Effective Damper Locationsmentioning

confidence: 99%

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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Section: Effective Damper Locationsmentioning

confidence: 99%

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

Ribakov

Agranovich

2014

Struct. Control Health Monit.

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“…The utilization of MRFs has been increasing in the different semi-active damping control applications in the low to moderate frequency ranges, including automotive suspension 28 , civil structures [29][30][31][32] , fluid clutches 33 , optical polishing 34 and a variety of aerospace applications [35][36][37][38] , vibration isolation 39,40 , automobile valves 41 and automotive damping applications 42 . Lord Corporation, the leading supplier of commercially proven MR fluids, devices and systems, manufactures three different MR fluids namely LORD MRF-122EG, LORD MRF-132DG and LORD MRF-140CG (ref.…”

Section: Studies On Mr Fluidsmentioning

confidence: 99%

“…MR dampers generally consist of a hydraulic cylinder containing micron-sized magnetically polarizable particles suspended within a fluid 31,32 . In the presence of strong magnetic field, the particles polarize and offer an increased resistance to flow.…”

Section: Application Of Mr Fluids -Mrfdmentioning

confidence: 99%

“…Experimental design and analytical studies on steel moment resisting frames (SMRF) for their improved performance of structures using viscous fluid and MRFDs have been carried out 31,32,63,64 . Two types of a one-quarter models of a steel moment resisting frame were designed and fabricated with toggle brace and scissor-jackmechanisms for damper displacement enhancement in the frame model.…”

Section: Performance Enhancement Of Steel Moment Resisting Frames Witmentioning

confidence: 99%

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Developments in Vibration Control of Structures and Structural Components with Magnetorheological Fluids

Raju¹,

Varma²

2017

Current Science

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Vibration isolation and control of structures subjected to different types of dynamic loads due to periodic forces, impact and shock type forces and earthquake forces is an important area in structural engineering. The structures can be machine foundations, buildings, bridges, towers, automobiles, ship structures, military tanks and aeronautical structures. Some of these devices used are elastic springs, viscoelastic dampers, viscous fluid dampers, magnetorheological dampers and friction dampers. This article gives latest developments in vibration control of structures and structural components using magnetorheological fluids. The current status of technology and further research requirements to be studied in these areas are highlighted.Keywords: Automobile brakes, magnetorheological fluids, structure and structural components, suspension systems, vibration control.IMPROVEMENT in manufacturing technology has provided machines of higher ratings, longer bridges, taller buildings which requires to satisfy the static, dynamic capacity and serviceability and stability limits for members/ systems prescribed by codes of practice. These machines/ structures give rise to considerable higher dynamic forces and thereby higher stresses. This demands development of advanced control and safety systems to keep the structural members/systems static and dynamic responses within tolerable levels. The performance, safety and stability of structures supporting the machines/structures depend largely on their design of suspension systems and their interaction with the environment. In this article, current status of technology in development of magnetorheological and friction dampers and their use in vibration control of structural and structural components in different fields of engineering applications are presented.

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“…Chu et al proposed a leverage‐type stiffness controllable mass damper to resolve this problem. These practical examples have proved that, through the amplification mechanism, high values of the magnification factor can easily be achieved and a large amount of input seismic energy can be consumed. However, because of the differences in structural deformation and the space limitation, the brace–damper systems are less effective and appropriate for precast walls.…”

Section: Introductionmentioning

confidence: 96%

Experimental and analytical investigations on new viscoelastic damped joints for seismic mitigation of structures with precast shear walls

Zhang

Gao

et al. 2019

Struct Control Health Monit

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Precast concrete wall has become a crucial part in the architectural industrialization, which is in line with the development trend of the building industry.On the basis of the analysis of relations between the deformation and the energy distribution of the precast concrete walls under major earthquakes, this investigation proposes the idea of a novel viscoelastic damped joint (VDJ) to create the vertical connection between two precast walls. By amplifying the displacements and velocities of the joint, the energy dissipating properties of damping materials can be fully used. The VDJ is suitable for improving the damping efficiency in the stiff shear wall structural systems. Performance tests were performed to study the mechanical properties of the damped joint. And then, a simplified analytical model of the VDJ with different parameters under various deformations and frequencies is presented. The numerical simulation results indicate that the simplified model is capable of capturing the main features of the VDJ. Furthermore, the analytical models on wall to wall connections were set up and incorporated into 2-D numerical models. To better understand the damping performances of the VDJ, three models connected by emulating cast in situ joints, precast hinged joints, and viscoelastic damped joints were prepared by analyzing the time history of the overall structural response. Results show that the VDJs are effective in attenuating seismic response of the precast walls. They worked in the dissipation of approximately 90% of input earthquake energy. The highly efficient damped joints also reduce interstory displacements and upgrade the structural performance of buildings during seismic excitation. KEYWORDS displacement dependence, fatigue performance, frequency dependence, magnification factor, precast shear wall, viscoelastic damped joint (VDJ)

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Experimental studies on seismic performance of three-storey steel moment resisting frame model with scissor-jack-magnetorheological damper energy dissipation systems

Cited by 8 publications

References 9 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

Developments in Vibration Control of Structures and Structural Components with Magnetorheological Fluids

Experimental and analytical investigations on new viscoelastic damped joints for seismic mitigation of structures with precast shear walls

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