Displacement-based seismic design of hysteretic damped braces for retrofitting in-elevation irregular r.c. framed structures

Mazza, Fabio; Mazza, Mirko; Vulcano, Alfonso

doi:10.1016/j.soildyn.2014.10.029

Cited by 59 publications

(34 citation statements)

References 21 publications

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“…the interior girders n. 2-7, n. 7-12, n. 3-8 and n. [8][9][10][11][12][13] and four (i.e. the interior columns n. 7 and n. 8) sides in the RS condition.…”

Section: Numerical Results: Seismic Loading Following Fireunclassified

“…On the other hand, it is well known that, even after a strong earthquake, greater seismic protection can be obtained by using supplementary damping devices supported by steel braces [2,3]. At present, a wide variety of damped braces is available [4][5][6][7][8][9][10][11][12]: displacement-dependent (e.g. friction damper, FRD; hysteretic damper, HYD), velocity-dependent (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Seismic vulnerability and retrofitting by damped braces of fire-damaged r.c. framed buildings

Mazza

2015

Engineering Structures

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“…the interior girders n. 2-7, n. 7-12, n. 3-8 and n. [8][9][10][11][12][13] and four (i.e. the interior columns n. 7 and n. 8) sides in the RS condition.…”

Section: Numerical Results: Seismic Loading Following Fireunclassified

Section: Introductionmentioning

confidence: 99%

Seismic vulnerability and retrofitting by damped braces of fire-damaged r.c. framed buildings

Mazza

2015

Engineering Structures

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“…More specifically, the stiffness distribution of the HYDBs could be evaluated consistently with a constant value of the drift ratio of the damped braced frame along the building height (Mazza et al 2015). Moreover, in order to eliminate (elastic) torsional effects, an inversely proportional stiffness criterion, which considers the same position of the mass and stiffness centres, could be assumed (Mazza 2014a).…”

Section: Hysteretic Damped Bracesmentioning

confidence: 99%

Displacement-based design procedure of damped braces for the seismic retrofitting of r.c. framed buildings

Mazza

Vulcano

2014

Bull Earthquake Eng

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The insertion of damped braces proves to be very effective for enhancing the performance of a framed building under seismic loads. For a widespread application of this technique suitable design procedures are needed. In this paper a design procedure which aims to proportion damped braces to attain a designated performance level of the structure, for a specific level of seismic intensity, is proposed. In particular, a proportional stiffness criterion, which assumes the elastic lateral storey-stiffness due to the braces proportional to that of the unbraced frame, is combined with the displacement-based design, in which the design starts from a target deformation. To check the effectiveness and reliability of the design procedure, a six-storey reinforced concrete plane frame, representative of a medium-rise symmetric framed building, is considered as primary structure. This, designed in a mediumrisk seismic region, has to be retrofitted as in a high-risk seismic region by the insertion of braces equipped with either metallic-yielding dampers or viscoelastic ones. Nonlinear dynamic analyses of unbraced and damped braced frames are carried out, under real (set A) and artificially generated (set B) ground motions, by a step-by-step procedure. Frame members and hysteretic dampers are idealized by bilinear models, while the viscoelastic dampers are idealized by a six-element generalized model describing the variation of the mechanical properties depending on the frequency, at a given temperature.

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“…Few solutions are found for problems characterized by significant irregularities in plan and/or in elevation. Among these, a method based on properly calibrated expressions of the damping ratio derived from the results of non-linear dynamic analyses is formulated in [41,42].…”

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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Displacement-based seismic design of hysteretic damped braces for retrofitting in-elevation irregular r.c. framed structures

Cited by 59 publications

References 21 publications

Seismic vulnerability and retrofitting by damped braces of fire-damaged r.c. framed buildings

Seismic vulnerability and retrofitting by damped braces of fire-damaged r.c. framed buildings

Displacement-based design procedure of damped braces for the seismic retrofitting of r.c. framed buildings

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

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