Finite element formulation and shaking table tests of direction-optimized-friction-pendulum system

Tsai, C. S.; Lu, Po-Ching; Chen, Wen-Shin; Chiang, Tsu‐Cheng; Yang, Chen-Tsung; Lin, Yung‐Chang

doi:10.1016/j.engstruct.2007.12.023

Cited by 25 publications

(9 citation statements)

References 7 publications

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“…To improve the expected performance of isolated structures, several innovative devices have been developed which incorporate multiple spherical sliding interfaces. As summarized in 4, Tsai et al . proposed a multiple friction pendulum system (MFPS) consisting of multiple sliding interfaces and an articulating slider.…”

Section: Multi‐stage Friction Pendulum Bearingsmentioning

confidence: 99%

Achieving reliable seismic performance enhancement using multi‐stage friction pendulum isolators

Morgan

Mahin

2010

Earthq Engng Struct Dyn

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SUMMARYAn objective in the design of seismically isolated structures is the selection of isolator properties so that performance enhancements are reliably achieved over a range of excitations and performance metrics. A challenge in the design of isolation systems is that, to withstand very severe or near-fault motions, bearings often become so large, stiff and strong that they provide little isolation during moderate seismic events. Numerical investigations are presented to characterize the performance of a new multi-stage friction pendulum (FP) isolation bearing, capable of progressively exhibiting different hysteretic properties at various levels of displacement demand. The feasibility of targeting these properties to achieve specific performance goals for a range of ground motion intensities and structural dynamic characteristics is investigated. In particular, the trade-off between limiting very rare isolator displacement demands and inducing high inter-story drift and floor accelerations is examined for a range of levels of seismic hazard. Nonlinear dynamic analyses of realistic building systems are presented, including a description of key structural demand parameters. To investigate the potential performance benefits of innovative devices, a complex multi-level performance objective termed a seismic performance classification is introduced. Results indicate that multi-stage FP bearings show improved reliability of meeting seismic performance objectives when multiple levels of seismic intensity are considered compared to those systems that incorporate conventional bilinear hysteretic energy dissipation mechanisms.

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Section: Multi‐stage Friction Pendulum Bearingsmentioning

confidence: 99%

Achieving reliable seismic performance enhancement using multi‐stage friction pendulum isolators

Morgan

Mahin

2010

Earthq Engng Struct Dyn

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“…Kelly and Konstantinidis (2011) reviewed the developmental history of multilayered, laminated rubber bearings. Tsai (2012) presented the developmental history and recent advancements (Tsai et al, 2005(Tsai et al, , 2006(Tsai et al, , 2008(Tsai et al, , 2010Tsai and Lin, 2011) in rolling-and sliding-type seismic isolation systems. The soil modifi es the characteristics of structures founded on soft soil by providing fl exibility, material damping, and radiation damping to them.…”

Section: Introductionmentioning

confidence: 99%

Roles of soil-structure interaction and damping in base-isolated structures built on numerous soil layers overlying a half-space

Tsai

Hsueh

2016

Earthq. Eng. Eng. Vib.

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This study examines the roles of soil-structure interaction (SSI), higher modes, and damping in a base-isolated structure built on multiple layers of soil overlying a half space. Closed-form solutions for the entire system, including a superstructure, seismic isolator, and numerous soil layers overlying a half-space, were obtained. The formulations obtained in this study simply in terms of well-known frequencies and mechanical impedance ratios can explicitly interpret the dynamic behavior of a base-isolated structure interacting with multiple soil layers overlying a half-space. The key factors infl uencing the performance of the isolation system are the damping ratio of the isolator and the ratio of the natural frequency of the fi xed-base structure to that of the isolated structure by assuming that the superstructure moves as a rigid body. This study reveals that higher damping in the base isolator is unfavorable to higher mode responses that usually dominate the responses of the superstructure and that the damping mechanism plays an important role in transmitting energy in addition to absorbing energy. It is also concluded that it is possible to design a soft soil layer as an isolation system for isolating vibration energy.

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“…A similar effect may also happen when using the CSSs, because their sliding surfaces are just in contact. Furthermore, because conventional CSS has fixed low frequency because of its spherical‐surface concavity, it may be forced into resonance with the long‐period components of the ground acceleration, which substantially increases the structural dynamic response . This resonance‐like phenomenon is also inevitable to RB, as it has already been witnessed in real near‐fault earthquakes .…”

Section: Introductionmentioning

confidence: 99%

Introduction of the convex friction system (CFS) for seismic isolation

Xiong

Zhang

Jiang³

et al. 2016

Struct. Control Health Monit.

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SUMMARYThis work introduces an innovative seismic isolation system named the convex friction system (CFS). This newly introduced isolation system has a sliding concavity with a circular cone-type surface, and exhibits some distinct features compared to conventional isolation techniques, such as increased uplift stability, improved self-centring capacity, and resonance dodge when subjected to near-fault earthquakes. A series of comprehensive analytical and numerical investigations are performed to verify these features of the CFS. First, the force-displacement relation of the CFS is established to describe the underlying philosophy of the system. The analytical model is then incorporated into numerical simulations to evaluate the seismic isolation performance of the CFS. Various ground accelerations, such as near-fault shakings, are included in these numerical calculations. Furthermore, the numerical results are rigorously investigated to illustrate the feasibility of the CFS. Finally, the limitations of the CFS study are discussed, and conclusions are drawn. The analytical and numerical results show that the CFS performs well in seismic isolation applications. The structural response can be reduced by approximately 30% with the CFS when compared to that with the Curved Surface Slider (CSS) with a spherical-surface concavity for some near-fault earthquakes, which verifies the aforementioned advantages of the CFS.

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Finite element formulation and shaking table tests of direction-optimized-friction-pendulum system

Cited by 25 publications

References 7 publications

Achieving reliable seismic performance enhancement using multi‐stage friction pendulum isolators

Achieving reliable seismic performance enhancement using multi‐stage friction pendulum isolators

Roles of soil-structure interaction and damping in base-isolated structures built on numerous soil layers overlying a half-space

Introduction of the convex friction system (CFS) for seismic isolation

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