Fully stressed design of passive controllers in framed structures for seismic loadings

Levy, Robert; Lavan, Oren

doi:10.1007/s00158-005-0558-5

Cited by 128 publications

(105 citation statements)

References 22 publications

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“…A wide variety of methods have been suggested to identify optimal damper placement (e.g. Apostolakis and Dargush 2010;Balling and Pister 1983;Garcia and Soong 2002;Gluck et al 1996;Lavan and Dargush 2009;Lee et al 2004;Levy and Lavan 2006;Moreschi 2001, 2002;Takewaki 2000;Yang et al 2002;Zhang and Soong 1992).…”

Section: Retrofit Feasibility Assessmentmentioning

confidence: 99%

Evaluating and improving the seismic performance of older tall buildings

Mahin¹,

Lai²,

Wang³

et al. 2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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The seismic performance of new tall buildings located in regions of high seismic hazard has been recently investigated by Pacific Earthquake Engineering Research (PEER) Center under its Tall Buildings Initiative (TBI) program. The Tall Building Initiative has now expanded to assess the seismic performance of existing tall buildings. Buildings being considered are 20 stories or more in height, and constructed on the West Coast of the U.S. between about 1960 and 1990. During this period, several hundred tall buildings were constructed in California, but earthquake-resistant design procedures had not yet been fully developed. From these structures, a 35-story steel building, designed in 1968, and having representative details from that period, was selected for evaluation. In this paper, results of three-dimensional nonlinear analysis models developed to assess the seismic performance of this structure are presented. Two earthquake hazard levels are used for the evaluation. Structural analysis results are interpreted to assess the impact of suspected deficiencies on seismic response, and the ability of different evaluation guidelines, numerical models and analysis methods to identify seismic vulnerabilities. A feasible retrofit strategy was identified. Recommendations are offered for further research and guideline evaluation.

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Section: Retrofit Feasibility Assessmentmentioning

confidence: 99%

Evaluating and improving the seismic performance of older tall buildings

Mahin¹,

Lai²,

Wang³

et al. 2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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“…It should also be noted that most of the above-mentioned methodologies assume a linear behavior of the damped structure and only a few consider yielding structures (e.g. [6]). …”

Section: Introductionmentioning

confidence: 99%

Design of passive systems for control of inelastic structures

Cimellaro

Lavan

Reinhorn

2008

Earthq Engng Struct Dyn

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SUMMARYA design strategy for control of buildings experiencing inelastic deformations during seismic response is formulated. The strategy is using weakened, and/or softened, elements in a structural system while adding passive energy dissipation devices (e.g. viscous fluid devices, etc.) in order to control simultaneously accelerations and deformations response during seismic events. A design methodology is developed to determine the locations and the magnitude of weakening and/or softening of structural elements and the added damping while insuring structural stability. A two-stage design procedure is suggested: (i) first using a nonlinear active control algorithm, to determine the new structural parameters while insuring stability, then (ii) determine the properties of equivalent structural parameters of passive system, which can be implemented by removing or weakening some structural elements, or connections, and by addition of energy dissipation systems. Passive dampers and weakened elements are designed using an optimization algorithm to obtain a response as close as possible to an actively controlled system. A case study of a five-story building subjected to El Centro ground motion, as well as to an ensemble of simulated ground motions, is presented to illustrate the procedure. The results show that following the design strategy, a control of both peak inter-story drifts and total accelerations can be obtained.

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“…Alternative approaches refer to the energy balance computed from time-history analyses [43,44], or optimization procedures [45]. Among the energy-based design methods, a criterion determining the minimum damping coefficients of the devices required to assign them the capability of dissipating a prefixed fraction β of the seismic input energy E I computed on each story [31,32] or the entire structure [12] was proposed by the author and co-authors.…”

Section: Introductionmentioning

confidence: 99%

Energy-Based Design Criterion of Dissipative Bracing Systems for the Seismic Retrofit of Frame Structures

Terenzi

2018

Applied Sciences

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Featured Application: An energy-based sizing criterion is proposed to help designing dissipative bracing systems incorporating fluid viscous spring-dampers for the seismic retrofit of frame structures.Abstract: Direct sizing criteria represent useful tools in the design of dissipative bracing systems for the advanced seismic protection of existing frame structures, especially when incorporated dampers feature a markedly non-linear behaviour. An energy-based procedure is proposed herein to this aim, focusing attention on systems including fluid viscous devices. The procedure starts by assuming prefixed reduction factors of the most critical response parameters in current conditions, which are evaluated by means of a conventional elastic finite element analysis. Simple formulas relating the reduction factors to the equivalent viscous damping ratio of the dampers, ξ eq , are proposed. These formulas allow calculating the ξ eq values that guarantee the achievement of the target factors. Finally, the energy dissipation capacity of the devices is deduced from ξ eq , finalizing their sizing process. A detailed description of the procedure is presented in the article, by distinguishing the cases where the prevailing structural deficiencies are represented by poor strength of the constituting members, from the cases having excessive horizontal displacements. A demonstrative application to the retrofit design of a reinforced concrete gym building is then offered to explicate the steps of the sizing criterion in practice, as well as to evaluate the enhancement of the seismic response capacities generated by the installation of the dissipative system.

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Fully stressed design of passive controllers in framed structures for seismic loadings

Cited by 128 publications

References 22 publications

Evaluating and improving the seismic performance of older tall buildings

Evaluating and improving the seismic performance of older tall buildings

Design of passive systems for control of inelastic structures

Energy-Based Design Criterion of Dissipative Bracing Systems for the Seismic Retrofit of Frame Structures

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