Extreme behavior in a triple friction pendulum isolated frame

Becker, Tracy C.; Bao, Yu; Mahin, Stephen A.

doi:10.1002/eqe.2924

Cited by 64 publications

(27 citation statements)

References 25 publications

(40 reference statements)

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“…For horizontal isolation systems, adaptive behavior has been proposed to meet multiple objectives under increasing levels of ground motion excitation (Fenz and Constantinou, 2007, Morgan and Mahin 2010, Yang et al, 2010, Becker et al, 2017, Van Engelen et al, 2016. The adaptability of these systems is derived from the physical configuration or material properties of the systems.…”

Section: Introductionmentioning

confidence: 99%

Evaluating adaptive vertical seismic isolation for equipment in nuclear power plants

Najafijozani

Becker

Konstantinidis

2020

Nuclear Engineering and Design

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Seismic isolation systems are widely recognized as beneficial for protecting both acceleration-and displacement-sensitive nonstructural systems and components. So-called adaptive isolation systems exhibit nonlinear characteristics that enable engineers to achieve various performance goals at different hazard levels. These systems have been implemented to control the horizontal response, but there has been limited research on seismic isolation for controlling the vertical response. Thus, this paper seeks to evaluate the benefit of adaptive vertical isolation systems for components, specifically in nuclear power plants (NPP). To do this, three vertical isolation systems are designed to achieve multiple goals: a linear spring and a linear damper (LSLD), a linear spring and a nonlinear damper (LSND) and a nonlinear spring and a linear damper (NSLD). To investigate the effectiveness of the systems, a stiff piece of equipment is considered at an elevated floor within a NPP. A set of 30 triaxial ground motions is used to investigate the seismic performance of the equipment. The maximum isolation displacement and equipment acceleration are used to assess the effectiveness of the three isolation systems. While all systems significantly reduce the seismic accelerations on the equipment, the relatively simple LSLD and LSND systems exhibit superior performance over multiple hazard levels.

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Section: Introductionmentioning

confidence: 99%

Evaluating adaptive vertical seismic isolation for equipment in nuclear power plants

Najafijozani

Becker

Konstantinidis

2020

Nuclear Engineering and Design

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“…Mosqueda et al [11] conducted experiments on a rigid-block frame supported by four bearings on the earthquake simulator platform to evaluate friction pendulum bearings under multiple components of excitation. Becker et al [12] practiced a dynamic unidirectional shake table test of a steel frame isolated with triple friction pendulum bearings, in which the ground motion input was increased until failure occurred in the isolation level.…”

Section: Introductionmentioning

confidence: 99%

Seismic Performance Analysis of a Connected Multitower Structure with FPS and Viscous Damper

Wang

Zhou

2018

Shock and Vibration

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A high four-tower structure is interconnected with a long sky corridor bridge on the top floor. To reduce the earthquake responses and member forces of the towers and sky corridor bridge, a passive control strategy with a friction pendulum tuned mass damper (FPTMD) was adopted. The sky corridor bridge was as the mass of FPTMD. The connection between the towers and the sky corridor bridge was designed as flexible links, where friction pendulum bearings (FPBs) and viscous dampers were installed. Elastoplastic time-history analysis was conducted by using Perform-3D model to look into its seismic behavior under intensive seismic excitation. The optimal design of the FPTMD with varying friction coefficients and radius of friction pendulum bearing (FPB) under seismic excitations was carried out, and the seismic behavior of the structure was also investigated at the same time.Results show that, for this four-tower connected structure, the friction pendulum tuned mass damper (FPTMD) has very well effect on seismic reduction. The structure can meet the seismic resistance design requirements.

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“…Over recent decades, the base isolation system has been shown to effectively protect structures and facilities against earthquakes . The friction pendulum system (FPS) isolator is a commonly used base isolation system . A conventional FPS isolator primarily consists of a slider and a sliding surface, which is usually concave shaped.…”

Section: Introductionmentioning

confidence: 99%

“…2,3 The friction pendulum system (FPS) isolator is a commonly used base isolation system. [4][5][6][7] A conventional FPS isolator primarily consists of a slider and a sliding surface, which is usually concave shaped. The gravitational load of the superstructure applied on the FPS isolator can provide a restoring force to reduce the residual displacement of the isolation layer.…”

Section: Introductionmentioning

confidence: 99%

Development of a tunable friction pendulum system for semi‐active control of building structures under earthquake ground motions

Pan

Zhang

Zeng

et al. 2018

Earthq Engng Struct Dyn

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Summary The Friction Pendulum System (FPS) isolator is commonly used as a base isolation system in buildings. In this paper, a new tunable FPS (TFPS) isolator is proposed and developed to act as a semi‐active control system by combining the traditional FPS and semi‐active control concept. Theoretical analysis and physical tests were carried out to investigate the behavior of the proposed TFPS isolator. The experimental and theoretical results were in good agreement, both suggesting that the friction force of the TFPS isolator can be tuned to achieve seismic isolation of the structure. A series of numerical simulations of a base‐isolated structure equipped with the proposed TFPS isolator and subjected to earthquake ground motions were also conducted. In the analyses, the linear quadratic regulator (LQR) method was adopted to control the friction force of the proposed TFPS, and the applicability and effectiveness of the TFPS in controlling the structure's seismic responses were investigated. The simulation results showed that the TFPS can reduce the displacement of the isolation layer without significantly increasing the floor acceleration and inter‐story displacement of the superstructure, confirming that the TFPS can effectively control a base‐isolated structure under earthquake ground motions.

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Extreme behavior in a triple friction pendulum isolated frame

Cited by 64 publications

References 25 publications

Evaluating adaptive vertical seismic isolation for equipment in nuclear power plants

Evaluating adaptive vertical seismic isolation for equipment in nuclear power plants

Seismic Performance Analysis of a Connected Multitower Structure with FPS and Viscous Damper

Development of a tunable friction pendulum system for semi‐active control of building structures under earthquake ground motions

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