Design of friction damped structures using lateral force procedure

Fu, Yaomin; Cherry, Sheldon H.

doi:10.1002/1096-9845(200007)29:7<989::aid-eqe950>3.3.co;2-z

Cited by 11 publications

(15 citation statements)

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“…Equation () is numerically very close to the 5% damped expressions in (for periods between 0.5–3.0 s) except that Equation () gives slightly lower values when ξ eff < 20 %. The mean and standard deviation of the percentage error of Equation () is plotted against the effective period and shown in Figure , discretized at T eff intervals of 0.1 s. Equation () is independent of the period for the range of parameters considered.…”

Section: Equivalent Linearization Methods For Normalized Displacementsupporting

confidence: 58%

“…The effective damping for the ASE method can be expressed as

ξ_{eff} = ξ_{ASE} = \int_{0}^{u} ((), E_{d} ((), u^{*}) d u^{*} / ((), 2 π K_{ASE} u^{3}))

where E d ( u *) is the total cyclic energy dissipation of the system at displacement u *. Closed‐form expressions for the effective damping and period were established in for the system in Figure (a). Following the original description of ASE , viscous damping can be incorporated into ξ eff by adding the contribution of the viscous force to E d ( u *) at the secant period T s ( u *).…”

Section: Equivalent Linearization Methods For Normalized Displacementmentioning

confidence: 99%

“… is the assumption of a linear elastic main structure, which is difficult to achieve in older structures, especially in the presence of P − Δ effects. The ASE method has been applied by Fu and Cherry to generate response curves of elasto‐plastic systems with friction dampers. However, these studies cannot be easily extended to other types of dampers.…”

Section: Overview Of Equivalent Linearization Techniquesmentioning

confidence: 99%

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A procedure for generating performance spectra for structures equipped with passive supplemental dampers

Guo

Christopoulos

2012

Earthq Engng Struct Dyn

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SUMMARY A procedure for estimating the peak response of SDOF systems equipped with passive supplemental dampers using code‐defined uniform hazard spectra is presented. The proposed procedure makes use of an improved equivalent linearization method that unifies the treatment of supplemental hysteretic and viscous‐viscoelastic damping and can be readily implemented in a computer script. Nonlinear time‐history analyses demonstrated that the proposed method makes significantly more reliable predictions than other common equivalent linearization methods for systems with supplemental dampers. Using the proposed procedure, performance spectra, which are plots of normalized response of SDOF systems with dampers, can be generated for practical performance‐based design. To obtain a more complete description of the system performance, a simplified method for estimating the residual drift is also verified using results of extensive nonlinear time‐history analyses. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Equivalent Linearization Methods For Normalized Displacementsupporting

confidence: 58%

“…The effective damping for the ASE method can be expressed as

ξ_{eff} = ξ_{ASE} = \int_{0}^{u} ((), E_{d} ((), u^{*}) d u^{*} / ((), 2 π K_{ASE} u^{3}))

Section: Equivalent Linearization Methods For Normalized Displacementmentioning

confidence: 99%

Section: Overview Of Equivalent Linearization Techniquesmentioning

confidence: 99%

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A procedure for generating performance spectra for structures equipped with passive supplemental dampers

Guo

Christopoulos

2012

Earthq Engng Struct Dyn

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“…It has been [10] proposed earlier a design method based on parametric studies, like slip load and frequency component of excitation loads. The researchers have [11] developed a design procedure based on force normalization coefficient. It has been [12] proposed earlier a rational linear iteration method based on substitute structure approach for the structure and the mechanical properties of passive energy devices, which are calculated by effective stiffness and effective viscous damping ratio.…”

Section: Introductionmentioning

confidence: 99%

Performance-based Design of RC Frame Buildings with Metallic and Friction Dampers

Chaudhury

Singh

2014

J. Inst. Eng. India Ser. A

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Supplemental energy dissipation is a technique of earthquake resistant design and for improving the seismic performance of existing buildings. In the present study, a comprehensive design methodology for performance based design of frame buildings with metallic and friction dampers has been proposed. In this study, the target performance level is aimed to achieve both in terms of interstorey drift and plastic hinge rotation. A non-iterative stepby-step design procedure is proposed to achieve the target performance level. The methodology provides the design yield forces in case of metallic dampers, and slip forces in case of friction dampers. A satisfactory distribution of both types of dampers along the height of the building is also provided in the methodology. The efficiency of the proposed design methodology is validated by applying to a ten storey building and performing nonlinear time history analysis. The building, with and without dampers, is subjected to five spectrum compatible time histories with peak ground acceleration of 0.24 g and the relative performance of the building with the two types of dampers is studied.

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“…These methodologies minimized different performance indices rather than aiming at a specified target performance index. Also proposed in the literature are design methodologies that are based on the condensation of the multi-degree-of-freedom ͑MDOF͒ structure to a single-degree-offreedom ͑SDOF͒ system ͑Vulcano 1995, Rao et al 1996, Fu and Cherry 2000. The condensation techniques presented in these papers do not require the same first modes for the braced and bare frames, and hence are not likely to lead to simultaneous slippage of the dampers, which is essential for the condensation to be accurate.…”

Section: Introductionmentioning

confidence: 99%

Seismic Design of Friction-Damped Braced Frames Based on Historical Records

2005

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This paper is concerned with the design of friction dampers designed to slip at a predetermined level and dissipate a substantial portion of the seismic energy, leaving the structure practically intact without its members having to yield or buckle. They are appropriate for use in seismic design of new buildings and in retrofitting existing structures. By choosing a practical design requirement rather than minimizing some energy criterion, a novel design procedure attains the stiffness of the individual braces and their displacements at the threshold of activation. The procedure is a two-phase process that uses in Phase 1 an equivalent single-degree-of-freedom ͑SDOF͒ system to obtain an optimal natural period of the structure by performing a full nonlinear dynamic analysis for a set of earthquake records. Phase 2 then enforces the same first mode on both the braced and unbraced frames, with the aim of ensuring simultaneous slippage. The procedure was applied to a 10-story steel frame. It yielded a rather technically attractive design of the braces since for close to mean plus standard deviation of the records, the resulting maximum roof displacements fell within the allowable design, as initially constrained to, and simultaneous slip of all braces occurred for most records. This procedure is rather simple in that the main computational effort, i.e., nonlinear analysis needed for Phase 1, is performed on an equivalent SDOF system only, whereas analysis of the multi-degree-of-freedom ͑MDOF͒ system is a linear eigenvalue analysis.

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Design of friction damped structures using lateral force procedure

Cited by 11 publications

References 0 publications

A procedure for generating performance spectra for structures equipped with passive supplemental dampers

A procedure for generating performance spectra for structures equipped with passive supplemental dampers

Performance-based Design of RC Frame Buildings with Metallic and Friction Dampers

Seismic Design of Friction-Damped Braced Frames Based on Historical Records

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