Effectiveness of sliding isolators with variable curvature in near‐fault ground motions

Shaikhzadeh, Ali Akbar; Karamoddin, Abbas

doi:10.1002/tal.1258

Cited by 20 publications

(19 citation statements)

References 18 publications

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“…They concluded that such large isolator displacements can be controlled by added viscous fluid dampers. Shaikhzadeh and Karamoddin reported that in a strong near‐fault earthquake, polynomial friction pendulum isolator and variable curvature friction pendulum system or conical friction pendulum isolator and variable frequency pendulum isolator could respectively be chosen based on whether reduction of base displacement or superstructure acceleration is the main concern of the structural designer. The undeniable need to control excessively large unfavorable displacements across the isolation layer was highlighted by Becker and Ezazi while confirming that base isolation was indeed successful in decreasing the accelerations transmitted to a structure.…”

Section: Introductionmentioning

confidence: 99%

Seismic response control of base‐isolated buildings using multiple tuned mass dampers

Stanikzai

Elias

Matsagar

et al. 2018

Structural Design Tall Build

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Summary Seismic response of a base‐isolated building equipped with single tuned mass damper (STMD), multiple tuned mass dampers (MTMDs), and distributed multiple tuned mass dampers (d‐MTMDs) under real earthquake ground motions is investigated. Numerical study is carried out using analytical models of five‐, 10‐, and 15‐storey base‐isolated buildings equipped with the STMD, MTMDs, and d‐MTMDs. The buildings are modeled as shear‐type structure with a lateral degree of freedom at each floor level, and the buildings are isolated using the laminated rubber bearing, lead‐core rubber bearing, friction pendulum system, and resilient‐friction base isolator. The coupled differential equation of motion for the buildings are derived and solved in the incremental form using Newmark's step‐by‐step method of integration. From the numerical study conducted, it is concluded that installing a tuned mass damper at each floor level of a base‐isolated building reduces the structural response in terms of top floor acceleration and bearing displacement. It is found that installing the MTMDs and d‐MTMDs are significantly beneficial in reducing top floor acceleration as compared with the STMD. Further, almost comparable reduction in the bearing displacement could be obtained by installing the STMD, MTMDs at top, and d‐MTMDs in the base‐isolated buildings. The d‐MTMDs are more beneficial as compared with the STMD and MTMDs as otherwise huge controller mass can now be divided and distributed on different floor levels.

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Section: Introductionmentioning

confidence: 99%

Seismic response control of base‐isolated buildings using multiple tuned mass dampers

Stanikzai

Elias

Matsagar

et al. 2018

Structural Design Tall Build

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“…Figure 16 presents the hysteretic curves of the horizontal force and displacement under different loading frequencies and contact pressures. It can be seen that the hysteretic curves of the horizontal force and displacement are regular, symmetrical, stable, and full, and remarkably reflect the excellent behavior of energy dissipation of the VCFPB (Sharma and Jangid, 2012).…”

Section: Friction Coefficient At the Equilibrium Positionmentioning

confidence: 78%

Experimental and Theoretical Studies of Bidirectional Variable Curvature Friction Pendulum Bearing

2020

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In this study, to satisfy the base isolation demand of large-scale building structures under different earthquake records, a new bidirectional variable curvature friction pendulum bearing (BD-VCFPB) is proposed. The VCFPB is designed in detail based on the basic principle of a friction pendulum system. Moreover, the sliding interface function, gap between the slider and the sliding interface, and polytetrafluoroethylene (PTFE) plate stress are studied. Finally, a dynamic cyclic test is conducted to study the influence of the slider size, contact pressure on the PTFE plate, and loading frequency on the hysteretic behavior of the VCFPB. The results indicate that the hysteretic curves of the horizontal force and the displacement are regular, symmetrical, stable, and full, and clearly reflect the variable curvature convex and concave characteristics and the excellent behavior of energy dissipation of the BD-VCFPB. The sliding friction coefficient varies significantly with the contact pressure on the PTFE plate and the loading frequency; however, it has little relation with the slider size. A hysteretic model is proposed based on the results of a unidirectional test, and it is in good agreement with the hysteretic curves of the horizontal force and the displacement from a bidirectional test. VCFPB PTFE Bidirectional loading test Hysteretic model Long-period ground motions CORRESPONDENCE Shu-Chao Lin

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“…Hong and Hur [18] published a study on systems with the addition of concave and springs to solve convergence problems. Shaikhzadeh presented a numerical simulation and a comparison of the effects of four sliding isolators with variable curvature insulators [19]. Research on RIS using spherical balls instead of cylindrical rollers has also been conducted and applied to light loads [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Analysis of an Isolation System with Vertical Spring-viscous Dampers in Horizontal and Vertical Ground Motion

Hur

Hong

2020

Applied Sciences

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This paper proposes a new vibration isolation mounting system, with spherical balls and vertical spring dampers, that provides seismic protection from horizontal and vertical ground excitation. To characterize the system, nonlinear governing equations are derived by considering the kinematics and interaction forces of the structures, and the dynamic characteristics of the design parameters are investigated by numerical analysis. The condition of contact stability for sustaining continuous friction of the isolation device is discussed, along with the design parameters. The vibration transfer characteristics are analyzed for the displacement transfer ratio obtained for the design parameters satisfying the sustainable contact condition, when the base is harmonically excited. The results confirm that the relative motion occurrence satisfies the conditional expression, and a jump in which the transfer ratio suddenly increases at a specific frequency is identified. Finally, design variables that are suitable for the horizontal and vertical acceleration of the El Centro earthquake are set, and a simulation confirms the vibration reduction effect in both the horizontal and vertical motions.

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Effectiveness of sliding isolators with variable curvature in near‐fault ground motions

Cited by 20 publications

References 18 publications

Seismic response control of base‐isolated buildings using multiple tuned mass dampers

Seismic response control of base‐isolated buildings using multiple tuned mass dampers

Experimental and Theoretical Studies of Bidirectional Variable Curvature Friction Pendulum Bearing

Analysis of an Isolation System with Vertical Spring-viscous Dampers in Horizontal and Vertical Ground Motion

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