Controlling All Interstory Displacements in Highly Nonlinear Steel Buildings Using Optimal Viscous Damping

Attard, Thomas L.

doi:10.1061/(asce)0733-9445(2007)133:9(1331)

Cited by 54 publications

(27 citation statements)

References 29 publications

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“…The modal mass ratio was 66.4%, which was less than 75% [Attard 2007], thus implying the presence of HME. If any of the W18×50 sections were to begin yielding, a smooth nonlinear model previously proposed by ] was assumed to govern the inelastic behavior, which was embedded in BISON.…”

Section: Equation Of Motion and The Lcr Modelmentioning

confidence: 97%

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Application and design of lead-core base isolation for reducing structural demands in short stiff and tall steel buildings and highway bridges subjected to near-field ground motions

Attard

Dhiradhamvit

2009

JOMMS

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The performance of nonlinear lead-core-rubber base isolators (LCR) to passively control highly nonlinear vibrations in two steel buildings and a prestressed concrete bridge under various ground motion inputs is evaluated. The Bouc and Wen model is used to predict the behavior of the lead-core component of the LCR base isolator. Members of the steel buildings that may have yielded are analyzed according to a highly nonlinear constitutive rule used to model the smooth stiffness degradation in the damaged members. The previously developed constitutive rule analyzes kinematically strain-hardened materials under cyclic conditions. The ability of the LCR to reduce displacement, velocity, and acceleration demands is demonstrated numerically using an algorithm developed herein called BISON (base isolation in nonlinear time history analysis). The performance of the LCR isolation is measured for a two story isolated building excited by the El Centro ground motion, a nonstationary signal, and the Northridge ground motion. An eight-story building exhibiting higher-mode influence is also analyzed, and finally the overpass bridge on Highway 99 in Selma, CA is modeled, outfitted with LCR isolation, and also analyzed. The hysteresis of the force-displacement relationships of the structures and the LCR isolators are analyzed parametrically through two LCR design parameters. The results indicate that with an appropriate tuning of these parameters, which affect the inelastic stiffness of the LCR isolator, an appropriate LCR system may be designed to behave with a stationary-like hysteresis and that can very adequately reduce the structural demands under the various excitations.

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Section: Equation Of Motion and The Lcr Modelmentioning

confidence: 97%

“…This fictitious bottom story represents the LCR base isolator in the real structure. Caughey damping, which has been used in a previous study by [Attard 2007], is assumed to be 5% in each mode of vibration. The value of K initial is calculated as…”

Section: Equation Of Motion and The Lcr Modelmentioning

confidence: 99%

Application and design of lead-core base isolation for reducing structural demands in short stiff and tall steel buildings and highway bridges subjected to near-field ground motions

Attard

Dhiradhamvit

2009

JOMMS

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“…In the design using linear and nonlinear viscous dampers, many useful methods have been developed (Uetani et al, 2003;Takewaki, 2007;Aydin et al, 2007;Attard, 2007;Lavan and Levy, 2010;Adachi et al, 2013aAdachi et al, , 2013b. On the other hand, in the design using hysteretic dampers, a limited number of methods has been proposed due to its complex characteristics (Uetani et al, 2003;Murakami et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Explicit optimal hysteretic damper design in elastic-plastic structure under double impulse as representative of near-fault ground motion

Shiomi

Fujita

Tsuji

et al. 2016

IJEIE

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A closed-form maximum elastic-plastic response is derived for a structure with hysteretic dampers under the critical double impulse as a representative of near-fault ground motion. It is shown that the classification into nine cases is possible depending on the combination of elastic-plastic responses of the structure and the hysteretic damper and the double impulse enables the derivation of the closed-form maximum elastic-plastic critical response of the controlled structure by using the energy balance in each case. It is demonstrated that the closed-form maximum elastic-plastic critical response is quite useful for finding an optimal hysteretic damper quantity depending on the input level of the double impulse.

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“…Thus, optimal design methods are of much importance. Consequently, considerable efforts were invested in developing optimal design methods for the seismic retrofitting of frame structures using viscous dampers (see, e.g., , and references therein). Most of the research was focused, however, on symmetric and regular structures.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous topology and sizing optimization of viscous dampers in seismic retrofitting of 3D irregular frame structures

Lavan

Amir

2014

Earthq Engng Struct Dyn

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SUMMARYA new methodology for performance‐based optimal seismic retrofitting using a limited number of size groups of viscous dampers is presented. The damping coefficient of each size group of dampers is taken as a continuous variable and is determined by the optimization algorithm. Furthermore, for each potential location, a damper of a single size group is optimally assigned, if any. Hence, the formulation presents a large step forward towards practical optimal design of dampers. The key for achieving an efficient optimization scheme is the incorporation of material interpolation techniques that were successfully applied in other structural optimization problems of discrete nature. This results in a very effective optimization methodology that is expected to be very efficient for large‐scale structures. The proposed approach is demonstrated on several example problems of 3D irregular frame structures. Copyright © 2014 John Wiley & Sons, Ltd.

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Controlling All Interstory Displacements in Highly Nonlinear Steel Buildings Using Optimal Viscous Damping

Cited by 54 publications

References 29 publications

Application and design of lead-core base isolation for reducing structural demands in short stiff and tall steel buildings and highway bridges subjected to near-field ground motions

Application and design of lead-core base isolation for reducing structural demands in short stiff and tall steel buildings and highway bridges subjected to near-field ground motions

Explicit optimal hysteretic damper design in elastic-plastic structure under double impulse as representative of near-fault ground motion

Simultaneous topology and sizing optimization of viscous dampers in seismic retrofitting of 3D irregular frame structures

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