Behavior of steel frames with rotational friction dampers by endurance time method

Shirkhani, Amir; Mualla, Imad H.; Shabakhty, Naser; Mousavi, Seyed Roohollah

doi:10.1016/j.jcsr.2015.01.016

Cited by 36 publications

(13 citation statements)

References 7 publications

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“…Indeed, structural responses at different IMs levels, presented by an incremental dynamic analysis (IDA), are provided by the ET method utilizing the least number (commonly three) of analyses [5]. In recent years, many studies have been carried out on the ET method [6][7][8][9][10][11]. Estekanchi and Basim [3] used an endurance time excitation function (ETEF) from the second generation of endurance time records [12,13] to find the optimal distribution of VDs in structures to satisfy two hazard levels of ASCE/SEI 41-06 [14].…”

Section: Introductionmentioning

confidence: 99%

Performance-based optimal distribution of viscous dampers in ‎structure using hysteretic energy compatible endurance time excitations

Shirkhani

Azar²,

Basim³

et al. 2021

NMCE

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Performance-based optimization of energy dissipation devices in structures necessitates massive and repetitive dynamic analyses. In the endurance time method known as a rather fast dynamic analysis procedure, structures are subjected to intensifying dynamic excitations and their response at multiple intensity levels is estimated by a minimal number of analyses. So, this method significantly reduces computational endeavors. In this paper, the endurance time method is employed to determine the optimal placement of viscous dampers in a weak structure to achieve the desired performance at various hazard levels, simultaneously. The viscous damper is one of the energy dissipation systems which can dissipate a large amount of seismic input energy to the structure. To this end, hysteretic energy compatible endurance time excitation functions are used and the validity of the results is investigated by comparing them with the results obtained from a suite of ground motions. To optimize the placement of the dampers, the genetic algorithm is used. The damping coefficients of the dampers are considered as design variables in the optimization procedure and determined in such a way that the sum of them has a minimum value. The behavior of the weak structure before and after rehabilitation is also investigated using endurance time and nonlinear time history analysis procedures in different hazard levels.

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Section: Introductionmentioning

confidence: 99%

Performance-based optimal distribution of viscous dampers in ‎structure using hysteretic energy compatible endurance time excitations

Shirkhani

Azar²,

Basim³

et al. 2021

NMCE

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“…The rotational friction dampers (FDs) have been proven to be effective in protecting structures against seismic events (Anoushehei et al, 2017; Kim et al, 2011; Mualla and Belev, 2002; Shirkhani et al, 2015). The seismic performance of FDs combined with other passive devices has also been investigated; Lee and Kim (2015) and Lee et al (2017) developed a hybrid damping devices by combining steel slit and FDs connected in parallel and showed that the hybrid dampers are especially effective in reducing seismic responses for small to medium earthquakes, compared with slit or FDs with the same yield strength.…”

Section: Introductionmentioning

confidence: 99%

Seismic retrofit of structures using rotational friction dampers with restoring force

Naeem

Kim

2020

Advances in Structural Engineering

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In this study, the seismic performance of a rotational friction damper with restoring force is presented. The torsional spring friction damper consists of rotational friction pads with the heavy duty torsional springs attached on both sides of the friction damper. An analytical model and a design procedure for the damper are developed using capacity spectrum method. A parametric study is carried out to investigate the influence of the torsional spring in the response of the structure when subjected to ground motions. The seismic performances of steel structures retrofitted with the torsional spring friction damper and conventional rotational friction dampers are evaluated using fragility analysis, which shows that the structure retrofitted with the torsional spring friction damper has the smallest probability of reaching the specific limit states.

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“…In 2015, nonlinear seismic analysis of a steel frame using single direction rotational friction dampers (RFDs) was performed by using the endurance time method. It was identified that installation of the RFDs in under-designed steel frames will decrease the maximum interstory drift ratio and will improve the seismic performance of such frames (Shirkhani et al, 2015). Because damping force varies with displacement for curved frictional surfaces, a single direction arc-surfaced frictional damper was developed using this feature in 2017.…”

Section: Introductionmentioning

confidence: 99%

Behavior of multidirectional friction dampers

Suk

Altıntaş

2020

Journal of Vibration and Control

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Earthquakes are catastrophic events causing loss of lives, injuries, and extensive losses in properties. Majority of the life and property losses of earthquakes are dependent on the incapabilities of the building stock to resist earthquakes. Although unsuitable design, analyses, and production techniques play a major role as the main reasons for the poor performance of buildings against earthquakes, buildings constructed in accordance with building codes also suffer from the devastating impact of earthquakes. In this context, the lack of proper management and adequate damping of the energy caused by earthquakes is a major cause of structural damage in earthquakes. The efficiency of conventional basic elements in structures with energy damping is very limited and may not be sufficient for the damping of a large amount of earthquake-induced energy. Thanks to the rapid advances in technology and associated engineering techniques, numerous new products, and production and calculation techniques are underway to mitigate the devastating effects of earthquakes on buildings. In this study, it was aimed to theoretically and experimentally investigate the performance of a versatile friction-type seismic damper that eliminates earthquake energy. The damper is designed using a spherical surface friction joint to respond to all loads regardless of the loading direction. The damper can be easily adjusted to the desired capacity by means of bolt tensioning elements. Experiments have been carried out for various shear loads and damping parameters. Furthermore, numerical analysis of the model was carried out by use of the finite element method. The results of this study revealed that the shear load capacity of the device did not change at different frequencies. Analyzing the effect of the equipment on a structure, it was understood that it reduces roof displacement and periods of the structure. The analysis revealed that the damper significantly improved the earthquake performance of the structure.

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Behavior of steel frames with rotational friction dampers by endurance time method

Cited by 36 publications

References 7 publications

Performance-based optimal distribution of viscous dampers in ‎structure using hysteretic energy compatible endurance time excitations

Performance-based optimal distribution of viscous dampers in ‎structure using hysteretic energy compatible endurance time excitations

Seismic retrofit of structures using rotational friction dampers with restoring force

Behavior of multidirectional friction dampers

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