Author
Finley A. Charney
Bio: Finley A. Charney is an academic researcher from Virginia Tech. The author has contributed to research in topics: Earthquake engineering & Seismic analysis. The author has an hindex of 16, co-authored 44 publications receiving 1314 citations.
Papers
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TL;DR: In this article, the authors present a summary of current practice and recent developments in the application of passive energy dissipation systems for seismic protection of structures, and present a design philosophy for analysis and design of structures employing EDS.
Abstract: This paper presents a summary of current practice and recent developments in the application of passive energy dissipation systems for seismic protection of structures. The emphasis is on the application of passive energy dissipation systems within the framing of building structures. Major topics that are presented include basic principles of energy dissipation systems, descriptions of the mechanical behavior and mathematical modeling of selected passive energy dissipation devices, advantages and disadvantages of these devices, development of guidelines and design philosophy for analysis and design of structures employing energy dissipation devices, and design considerations that are unique to structures with energy dissipation devices. A selection of recent applications of passive energy dissipation systems is also presented.
517 citations
TL;DR: In this paper, the effect of Rayleigh proportional damping in the analysis of inelastic structural systems is investigated, and it is shown that when the stiffness portion of the system damping matrix is based on the original system stiffness, artificial damping is generated when the structure yields.
Abstract: This paper investigates the consequence of using Rayleigh proportional damping in the analysis of inelastic structural systems. The discussion is presented theoretically, as well as by example through the analysis of a simple five-story structure. It is shown that when the stiffness portion of the system damping matrix is based on the original system stiffness, artificial damping is generated when the structure yields. When the damping matrix is based on the tangent stiffness but the Rayleigh proportionality constants are based on the initial stiffness, a significant but reduced amplification of damping occurs. When the damping is based on the tangent stiffness and on updated frequencies based on this stiffness, virtually no artificial damping occurs. The paper also investigates the influence on effective damping when localized yielding occurs in areas of concentrated inelasticity. In such cases, it is possible to develop artificial viscous damping forces that are extremely high, but that are not easy to detect. Such artificial damping forces may lead to completely invalid analysis. The paper ends with recommendations for performing analysis where the artificial damping is eliminated, or at least controlled.
279 citations
TL;DR: In this article, a new visco-plastic damper (VPD) for seismic protection of structures is introduced, which combines and enhances many of the proven characteristics of both displacement-dependent and velocity-dependent devices.
67 citations
TL;DR: A hybrid passive control device (HPCD) consisting of a high-damping rubber damper in series with a buckling-restrained brace (BRB) provides an innovative method of reducing structural response during seismic events as discussed by the authors.
61 citations
TL;DR: In this paper, a hybrid buckling-restrained braced frame (BRBF) is proposed for low earthquake hazard levels, which uses carbon steel (A36), high performance steel (HPS), and low yield point (LYP) steel in the core of the brace.
60 citations
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2,687 citations
TL;DR: In this article, the authors present a summary of current practice and recent developments in the application of passive energy dissipation systems for seismic protection of structures, and present a design philosophy for analysis and design of structures employing EDS.
Abstract: This paper presents a summary of current practice and recent developments in the application of passive energy dissipation systems for seismic protection of structures. The emphasis is on the application of passive energy dissipation systems within the framing of building structures. Major topics that are presented include basic principles of energy dissipation systems, descriptions of the mechanical behavior and mathematical modeling of selected passive energy dissipation devices, advantages and disadvantages of these devices, development of guidelines and design philosophy for analysis and design of structures employing energy dissipation devices, and design considerations that are unique to structures with energy dissipation devices. A selection of recent applications of passive energy dissipation systems is also presented.
517 citations
TL;DR: In this article, a practical modeling approach to solve some of the pitfalls of conventional numerical modeling of Rayleigh-type damping in inelastic structures is proposed, by modeling each structural element with an equivalent combination of one elastic element with stiffness-proportional damping, and two springs at its two ends with no stiffness proportional damping.
273 citations
271 citations