A Probabilistic Approach Towards an Evaluation of Existing Code Provisions for Seismically Isolated Structures

Tsiavos, Anastasios; Stojadinović, Božidar

doi:10.7712/100016.2203.10015

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…Each IDA curve is derived from the nonlinear dynamic analysis of the RC building subjected to an incrementally scaled ground motion record and comprises 20 points. These points correspond to 20 increments of the PGA of the scaled record, as performed by Tsiavos and Stojadinovic (2016). The scaling is automated by the PBEE toolbox using a hunt and fill algorithm developed by Vamvatsikos and Cornell (2004).…”

Section: Incremental Dynamic Analysismentioning

confidence: 99%

Compliance-based estimation of seismic collapse risk of an existing reinforced concrete frame building

Tsiavos

Amrein

Bender

et al. 2021

Bull Earthquake Eng

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Seismic evaluation of existing structures is based on determining the damage likely to occur during the lifetime of these structures due to earthquake ground motion excitation. However, there is not a consensus about the acceptable level of seismic damage, the expected lifetime of these structures, and the seismic hazard level(s) to evaluate the structures at. This paper presents a methodology for a parametric calculation of the seismic collapse risk of an existing Reinforced Concrete (RC) frame building based on its seismic code compliance, quantified by a dimensionless metric. This metric, defined as compliance factor, compares the seismic capacity of an existing structure with the seismic demand for a new structure at a predetermined hazard level. The inelastic seismic behavior of four models of the RC frame building of varying compliance was analytically investigated in this study to demonstrate the novel methodology. The four models of the RC building were chosen to represent existing RC frame structures designed and constructed before the introduction of modern seismic code provisions. These four building models were excited by a group of earthquake ground motion excitations using Incremental Dynamic Analysis. The collapse probabilities of the four building models, representing varying values of seismic code compliance, were determined for two different locations corresponding to regions of moderate and high seismic hazard, thus laying the basis for the compliance-based estimation of the seismic collapse risk of existing structures.

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Section: Incremental Dynamic Analysismentioning

confidence: 99%

Compliance-based estimation of seismic collapse risk of an existing reinforced concrete frame building

Tsiavos

Amrein

Bender

et al. 2021

Bull Earthquake Eng

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show abstract

“…However, seismically isolated structures can be subjected to inelastic behavior and damage, when they are excited by earthquake ground motion with intensities exceeding the design seismic hazard level. Furthermore, seismically isolated structures can manifest inelastic behavior even for ground motion intensities corresponding to the design hazard level, when they are unintentionally constructed with lower strength than the value prescribed by the code provisions [4][5][6][7]. The investigation of such behavior of existing seismically isolated structures sheds light on their reliability and robustness compared to fixed-based structures, as defined by Castaldo et al [8,9], Tsang [10] and Peng et al [11].…”

Section: Introductionmentioning

confidence: 99%

Inelastic Response Modes of Seismically Isolated Structures: Failure of the Isolators or Damage in the Isolated Structure?

Tsiavos¹,

Markić²,

Schlatter³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The goal of this study is to determine experimentally the inelastic response modes of seismically isolated structures. A steel specimen is designed and constructed to simulate the dynamic behavior of a Single-Degree-Of-Freedom (SDOF) system. The specimen is seismically isolated with four friction pendulum bearings and excited by a group of earthquake ground motion records using the shaking table of ETH Zurich Laboratory. A mechanical clevis connection consisting of two hinges and two replaceable steel coupons is designed and constructed to facilitate the parametric investigation of the inelastic response of the isolated structure for varying values of its strength. Two fundamentally different inelastic response modes have been observed during the excitation of the structure: A response mode dominated by large sliding displacement demand in the isolators and a response mode characterized by large displacement ductility demand in the isolated structure. This paper shows the effect of the design parameters of the isolation system and the isolated structure on the manifestation of these two response modes, thus paving the way for the understanding of the inelastic response of seismically isolated structures subjected to extreme earthquake ground motions.

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Shaking table investigation of inelastic deformation demand for a structure isolated using friction-pendulum sliding bearings

et al. 2021

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A Probabilistic Approach Towards an Evaluation of Existing Code Provisions for Seismically Isolated Structures

Cited by 3 publications

References 13 publications

Compliance-based estimation of seismic collapse risk of an existing reinforced concrete frame building

Compliance-based estimation of seismic collapse risk of an existing reinforced concrete frame building

Inelastic Response Modes of Seismically Isolated Structures: Failure of the Isolators or Damage in the Isolated Structure?

Shaking table investigation of inelastic deformation demand for a structure isolated using friction-pendulum sliding bearings

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