Self‐centering structural systems with combination of hysteretic and viscous energy dissipations

Kam, W.Y.; Pampanin, Stefano; Palermo, Alessandro; Carr, Athol J.

doi:10.1002/eqe.983

Cited by 143 publications

(60 citation statements)

References 29 publications

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“…The use of viscous dampers in parallel to self-centering rocking walls has been proposed as an effective way to control peak story drifts and residual drifts (Kurama 2000). The parallel combination of hysteretic and viscous energy dissipation along with a friction slip mechanism in series connected to the viscous energy dissipation mechanism were found to achieve high levels of seismic performance (Kam et al 2010). The parallel use of viscous dampers and steel SC-MRFs was found capable to simultaneously control inelastic deformations, peak storey drifts, and residual storey drifts (Tzimas et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions

Tzimas

Kamaris

Karavasilis

et al. 2016

Bull Earthquake Eng

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Abstract:The potential of post-tensioned self-centering moment-resisting frames (SCMRFs) and viscous dampers to reduce the collapse risk and improve the residual drift performance of steel buildings in near-fault regions is evaluated. For this purpose, a prototype steel building is designed using different seismic-resistant frames, i.e.: moment-resisting frames (MRFs); MRFs with viscous dampers; SC-MRFs; and SC-MRFs with viscous dampers. The frames are modeled in OpenSees where material and geometrical nonlinearities are taken into account as well as stiffness and strength deterioration. A database of 91 nearfault, pulse-like ground motions with varying pulse periods is used to conduct incremental dynamic analysis (IDA), in which each ground motion is scaled until collapse occurs. The probability of collapse and the probability of exceeding different residual story drift threshold values are calculated as a function of the ground motion intensity and the period of the velocity pulse. The results of IDA are then combined with probabilistic seismic hazard analysis models that account for near-fault directivity to assess and compare the collapse risk and the residual drift performance of the different seismic-resistant frames. The paper highlights the benefit of combining the post-tensioning and supplemental viscous damping technologies in the near-source. In particular, the SC-MRF with viscous dampers is found to achieve significant reductions in collapse risk and probability of exceedance of residual story drift threshold values compared to the MRF.

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Section: Introductionmentioning

confidence: 99%

Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions

Tzimas

Kamaris

Karavasilis

et al. 2016

Bull Earthquake Eng

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“…They also found that ductility demands can significantly decrease by increasing the energy dissipation capacity and the post-yield stiffness ratio of self-centering systems. Recently, Kam et al [28] showed that a parallel combination of self-centering systems of sufficient hysteretic energy dissipation capacity with viscous dampers can achieve superior performance compared to other structural systems, especially when the peak viscous damper force is controlled by implementing a friction slipping element in series with the viscous damper.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the increase in total accelerations of conventional yielding and self-centering systems due to added damping [19,[28][29] should be quantified. A detailed evaluation of the effect of added damping on residual displacements of conventional yielding systems is missing.…”

Section: Introductionmentioning

confidence: 99%

Seismic structural and non-structural performance evaluation of highly damped self-centering and conventional systems

Karavasilis

Seo

2011

Engineering Structures

107

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This paper evaluates the seismic structural and non-structural performance of selfcentering and conventional structural systems combined with supplemental viscous dampers. For this purpose, a parametric study on the seismic response of highly damped single-degree-of-freedom systems with self-centering flag-shaped or bilinear elastoplastic hysteresis is conducted. Statistical response results are used to evaluate and quantify the effects of supplemental viscous damping, strength ratio and period of vibration on seismic peak displacements, residual displacements and peak total accelerations. Among other findings, it is shown that decreasing the strength of nonlinear systems effectively decreases total accelerations, while added damping increases total accelerations and generally decreases residual displacements. Interestingly, this work shows that in some instances added damping may result in increased residual displacements of bilinear elastoplastic systems. Simple design cases demonstrate how these findings can be considered when designing highly damped structures to reduce structural and nonstructural damage.

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“…the Rangitikei Railway Bridge [1]), while extensive analytical and experimental work has been performed on rocking shear walls in precast structures (e.g. [2], [3], [4]). Furthermore, guidelines addressing this alternative seismic design have been published by several organizations.…”

Section: Introductionmentioning

confidence: 99%

A New Computational Approach for the Rocking Response of Deformable Bodies Considering Material Nonlinearity

Avgenakis¹,

Psycharis²

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. An increasing interest in the use of rocking members in earthquake resistant structural systems has been observed in recent years. The benefits of such members include the limitation of the damage, re-centering capabilities and reduction of seismic forces transmitted to the rest of the structure due to a yield-like response.Despite the importance of such members, few models able to describe the response of flexible rocking members in structural systems realistically can be found in literature, since most of the research focuses on the response of rigid bodies or ignores the stress nonlinearity near the contact area, which is considered crucial to the accurate determination of the rocking response of deformable rocking bodies. A new macro-element formulation for elastic rocking members has been proposed by the authors in previous papers which is able to take into account this stress nonlinearity, producing results which are very close to the ones produced by conventional finite element programs.Rocking members in structural systems are expected to behave inelastically for large seismic excitations. In this paper, the macroelement presented previously by the authors, which considered the element material to be elastic, is extended to also take material nonlinearity into account. The effect of the nonlinear stress distribution across the rocking interface on the member displacements is determined and approximate formulas for their determination are included in the macro-element formulation. The results produced by the macro-element with the inelastic material are finally compared to the ones of conventional finite element codes, showing very good agreement between the results of the two methods.

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Self‐centering structural systems with combination of hysteretic and viscous energy dissipations

Cited by 143 publications

References 29 publications

Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions

Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions

Seismic structural and non-structural performance evaluation of highly damped self-centering and conventional systems

A New Computational Approach for the Rocking Response of Deformable Bodies Considering Material Nonlinearity

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