Estimation of Cyclic Demand in Metallic Yielding Dampers Installed on Frame Structures

Morillas, Leandro; Escolano‐Margarit, David

doi:10.3390/app10124364

Cited by 7 publications

(6 citation statements)

References 25 publications

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“…Among hysteretic dampers, devices based on the plastic deformation of mild steel are the most popular due to their stability at high levels of deformation, negligible degradation and reliability during repeated cycles, and good resistance to weathering and aging. Different types of steel dampers have been proposed and tested for implementation in structures (Javanmardi et al 2020;Di Cesare et al 2014;2017b;Pampanin et al 2017;Morillas et al 2020;Mohsenian et al 2018), including torsional or flexural beams (Montuori et al 2015), single-axis dampers (Skinner et al 1974) U-strips (Baird et al 2014;Buchanan et al 2007), buckling-restrained braces (BRB) (Watanabe et al 1988;Foti et al 2020), crescent shaped braces (CSBs) (Palermo et al 2014(Palermo et al , 2015(Palermo et al , 2017Kammouh et al 2018), and energy dissipative steel cushions (Ozkaynak et al 2018;Gullu et al 2019). In parallel to the development of the hardware, viable design procedures and configurations of dissipative bracing systems incorporating metallic dampers have been envisaged for the seismic retrofitting of existing r.c and steel buildings (Akcelyan et al 2016;Barbagallo et al 2017;Bergami et al 2013;Di Cesare et al 2017a;Durucan et al 2010;Mazza et al 2015a;2015b;2016a, b;Nuzzo et al 2019;O'Reilly et al 2016;Gandelli et al 2019;Mohammadi et Al.…”

Section: Introductionmentioning

confidence: 99%

“…The performance of a hysteretic damper is defined by: (1) the force-displacement constitutive law, which is an inherent characteristic of the device; (2) the number of cycles sustained during the earthquake, which depends on the duration of the ground motion and the fundamental frequency of the structural system where the damper is employed. The number of cycles defines the total amount of energy dissipated by the system for a given displacement but is also associated to the degradation and possible failure of the device due to low-cycle fatigue (Morillas et al 2020).…”

Section: Introductionmentioning

confidence: 99%

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Cyclic engagement of hysteretic steel dampers in braced buildings: a parametric investigation

Gandelli

Domenico

Quaglini

2021

Bull Earthquake Eng

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Hysteretic steel dampers have been effectively used to improve the seismic performance of framed buildings by confining the dissipation of seismic energy into sacrifical, replaceable devices which are not part of the gravity framing system. The number of cycles sustained by the dampers during the earthquake is a primary design parameter, since it can be associated to low-cycle fatigue, with ensuing degradation of the mechanical properties and potential failure of the system. Current standards, like e.g. the European code EN 15129, indeed prescribe, for the initial qualification and the production control of hysteretic steel dampers, cyclic tests in which the devices are assessed over ten cycles with amplitude equal to the seismic design displacement dbd. This paper presents a parametric study focused on the number of effective cycles of the damper during a design earthquake in order to assess the reliability of the testing procedure proposed by the standards. The study considers typical applications of hysteretic steel dampers in low and medium-rise steel and reinforced concrete framed buildings and different ductility requirements. The results point out that the cyclic engagement of the damper is primarily affected by the fundamental period of the braced building and the design spectrum, and that, depending on these parameters, the actual number of cycles can be substantially smaller or larger that recommended by the standards. A more refined criterion for establishing the number of cycles to be implemented in testing protocols is eventually formulated.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cyclic engagement of hysteretic steel dampers in braced buildings: a parametric investigation

Gandelli

Domenico

Quaglini

2021

Bull Earthquake Eng

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“…On one hand, displacement-based quantities are not able to effectively capture the effects of cumulative damage (e.g., repeated cyclic loading and/or the number of plastic excursions), while, on the other hand, characterizing the structural damage by only energybased quantities may be challenging (e.g., Kazantzi and Vamvatsikos, 2018). Although several studies have proved that designing with energy-based parameters allows for the prediction of displacement-based quantities (e.g., Benavent-Climent, 2011;Morillas and Escolano-Margarit, 2020;Mota-Páez et al, 2021), these methodologies could increase the dispersion of the results in terms of displacement-based quantities from the target (Benavent-Climent and Mota-Páez, 2017), adding further epistemic uncertainties to the inherent and unavoidable aleatory uncertainties associated with the seismic demand. Furthermore, in the latter energy-based approach, displacement-based peak quantities would be assessed only indirectly, whereas a DDBD approach would allow for a direct control of the displacement demand.…”

Section: Introductionmentioning

confidence: 99%

Inelastic response spectra for an integrated displacement and energy-based seismic design (DEBD) of structures

Proietti,

Pedone,

D'Amore

et al. 2023

Front. Built Environ.

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The severe socio-economic impact of recent earthquakes has further highlighted the crucial need for a paradigm shift in performance-based design criteria and objectives towards a low-damage design philosophy, in order to reduce losses in terms of human lives, repair/reconstruction costs, and recovery time (deaths, dollars and downtime). Currently, displacement-based parameters are typically adopted to design/assess the seismic performance of the structures, by limiting the maximum displacement or the maximum interstorey drift ratio (IDR) reached by the structure under different earthquake intensities. However and arguably, displacement-based quantities are characterized by inherent weaknesses, since, for instance, they are not cumulated parameters, thus not able to capture directly the effects of multiple cycles, deterioration and damage cumulation. Therefore, in the last decades, energy-based approaches were investigated and developed in order to establish alternative engineering demand parameters for the assessment of post-event damage through a dynamic energy balance. Towards the main goal of developing an integrated Displacement and Energy-Based Design/assessment procedure (DEBD) for actual use in practice, this research work proposes an innovative approach based on the use of inelastic spectra correlating the energy components with the corresponding maximum displacement response parameters of the structure. In practical terms, the proposal is to further integrate and develop the well-known Direct Displacement-Based Design, by directly adopting the hysteretic energy as an additional design parameter. The energy inelastic spectra are developed through an extensive parametric analysis of Single-Degree-of-Freedom (SDoF) systems, with different nonlinear hysteretic models. In such an approach, the maximum seismic energy demand imparted to a structure can be directly predicted and controlled, whilst distinguishing the various components of the energy balance, including the hysteretic one. The effects of near-field and far-field earthquakes are also investigated. Results show that in the first case the seismic demand is concentrated in the peak of a few large cycles that absorb the demand energy induced by the high component in peak ground velocity in the second case the higher equivalent number of plastic cycles tends to become critical for structures with inadequate structural details and prone to suffer by cumulative cycles and overall plastic fatigue mechanisms.

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“…Other authors have investigated the effect of near-fault earthquakes on framed structures equipped with friction and viscous dampers [14][15][16], concluding that the use of energy dissipation devices improved the behaviour of the structures studied. Even so, the literature about hysteretic dampers in near-fault scenarios is very limited [17] and, to the best of the authors' knowledge, inexistent for the particular case of RC frames with hysteretic dampers only in the first story.…”

Section: Introductionmentioning

confidence: 99%

Seismic Response of RC Frames with a Soft First Story Retrofitted with Hysteretic Dampers under Near-Fault Earthquakes

2021

Self Cite

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Reinforced concrete (RC) frame structures with open first stories and masonry infill walls at the upper stories are very common in seismic areas. Under strong earthquakes, most of the energy dissipation demand imposed by the earthquake concentrates in the first story, and this eventually leads the building to collapse. A very efficient and cost-effective solution for the seismic upgrading of this type of structure consists of installing hysteretic dampers in the first story. This paper investigates the response of RC soft-story frames retrofitted with hysteretic dampers subjected to near-fault ground motions in terms of maximum displacements and lateral seismic forces and compares them with those obtained by far-field earthquakes. It is found that for similar levels of total seismic input energy, the maximum displacements in the first story caused by near-fault earthquakes are about 1.3 times larger than those under far-field earthquakes, while the maximum inter-story drift in the upper stories and the distribution and values of the lateral forces are scarcely affected. It is concluded that the maximum displacements can be easily predicted from the energy balance of the structure by using appropriate values for the parameter that reflects the influence of the impulsivity of the ground motion: the so-called equivalent number of cycles.

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Estimation of Cyclic Demand in Metallic Yielding Dampers Installed on Frame Structures

Cited by 7 publications

References 25 publications

Cyclic engagement of hysteretic steel dampers in braced buildings: a parametric investigation

Cyclic engagement of hysteretic steel dampers in braced buildings: a parametric investigation

Inelastic response spectra for an integrated displacement and energy-based seismic design (DEBD) of structures

Seismic Response of RC Frames with a Soft First Story Retrofitted with Hysteretic Dampers under Near-Fault Earthquakes

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