Prediction of inelastic response periods of buildings based on intensity measures and analytical model parameters

Katsanos, Evangelos; Sextos, Anastasios; Elnashai, Amr S.

doi:10.1016/j.engstruct.2014.04.007

Cited by 36 publications

(37 citation statements)

References 33 publications

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“…The adopted fiber model enabled also the efficient capture of the inelastic response while the embedded yield-oriented model, provided by IDARC 2D (Figure 1, right), was used to account for stiffness degradation, strength deterioration, non-symmetric response and pinching effect. More details about the degrading rules and the associated parameters can be found elsewhere [30,50]. Concerning the degrading hysteresis model adopted herein, four parameters control the inelastic loading reversals: α, accounting for stiffness degradation, β 1 and β 2 affecting strength deterioration and the slip parameter γ that controls the pinching because of the closing of the cracks and bond slip, which occurs during the reloading phase.…”

Section: Methodsmentioning

confidence: 99%

“…Spectral acceleration specified at period T T el Elastic period of SDOF system T in Inelastic (predominant) period of SDOF system T m Mean period of strong ground motion T motion Total duration of strong ground motion T 1 Fundamental elastic period of structures u m Maximum deformation of the nonlinear system u y Yield deformation u 0 Elastic deformation v s,30 Shear-wave velocity at the upper 30 m of soil profile APPENDIX ATable AI. Earthquake events used in this study and related information.…”

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confidence: 99%

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Inelastic spectra to predict period elongation of structures under earthquake loading

Katsanos

Sextos

2015

Earthq Engng Struct Dyn

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Summary Period lengthening, exhibited by structures when subjected to strong ground motions, constitutes an implicit proxy of structural inelasticity and associated damage. However, the reliable prediction of the inelastic period is tedious and a multi‐parametric task, which is related to both epistemic and aleatory uncertainty. Along these lines, the objective of this paper is to investigate and quantify the elongated fundamental period of reinforced concrete structures using inelastic response spectra defined on the basis of the period shift ratio (Tin/Tel). Nonlinear oscillators of varying yield strength (expressed by the force reduction factor, Ry), post‐yield stiffness (ay) and hysteretic laws are examined for a large number of strong motions. Constant‐strength, inelastic spectra in terms of Tin/Tel are calculated to assess the extent of period elongation for various levels of structural inelasticity. Moreover, the influence that structural characteristics (Ry, ay and degrading level) and strong‐motion parameters (epicentral distance, frequency content and duration) exert on period lengthening are studied. Determined by regression analyses of the data obtained, simplified equations are proposed for period lengthening as a function of Ry and Tel. These equations may be used in the framework of the earthquake record selection and scaling. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Inelastic spectra to predict period elongation of structures under earthquake loading

Katsanos

Sextos

2015

Earthq Engng Struct Dyn

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“…This practically implies that the record-to-record variability at the fundamental period of the structure is reduced, and in turn, the discrepancy in the structural response of the corresponding SDOF system is also lower. Some concerns have been expressed regarding the appropriate choice of CMS and the conditioning period, primarily related to the importance of higher modes of vibration of MDOF systems and the anticipated period elongation under strong ground motions (Katsanos et al 2014). However, it has been shown that risk-based assessments are relatively insensitive to the choice of conditioning period provided that the ground motions are carefully selected to ensure hazard consistency (Lin et al 2013a).…”

Section: Selection and Scaling To A Proxy ("«") Of The Target Conditimentioning

confidence: 98%

Selection of Ground Motions for Response History Analysis

Sextos

2014

Encyclopedia of Earthquake Engineering

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“…For the nonlinear analyses using strong ground motions, three subsets of 10 ground motion records each, for a total of 30, were selected in appropriate ensembles with a distinct mean frequency content, from a pool of 300 properly categorized ground motions (Katsanos et al, 2014).…”

Section: Nonlinear Response History Analysis (Case A6)mentioning

confidence: 99%

Seismically induced uplift effects on nuclear power plants. Part 1: Containment building rocking spectra

Sextos

Manolis

Athanasiou

et al. 2017

Nuclear Engineering and Design

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. focusing primarily on the response of the containment structure of a nuclear power plant.However, in current state-of-practice and in most seismic regulations worldwide, the consideration of soil-structure interaction and potential development of geometrically nonlinear effects, such as rocking and sliding with uplift, is not taken into consideration. To explore this issue, a refined 3Dfinite element model of a typical nuclear power plant containment structure is developed, comprising solid elements for the soil and foundation, plus shell elements for the structure. The aim is identification of foundation-soil separation phenomena under a suite of ground motions with distinct frequency content. At first, harmonic excitations are used, for both cases of stiff sand and rock subsoil profiles, leading to rocking spectra that depict the displacement demand in connection with nonlinear separation. Clear influence zones can be distinguished, especially in the low frequency bands for the stiff sand case. Next, three subsets of 30 ground motion records are carefully selected and grouped in ensembles according to their frequency content, normalized to a PGA of 0.36g, which corresponds to the highest design acceleration in Europe. Ground motions with low mean frequency content are observed to lead to the onset of geometrically nonlinear phenomena, along with a higher displacement demand. The interplay between ground motion characteristics, dynamic properties of the containment structure and stiffness of the soil is also highlighted. More specifically, it is shown that stiff containment structures on soft soils are more prone to foundation uplift. This possibility is often neglected in design codes and the consequence is that under certain circumstances, damage may be caused to the internal power generation equipment..

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Prediction of inelastic response periods of buildings based on intensity measures and analytical model parameters

Cited by 36 publications

References 33 publications

Inelastic spectra to predict period elongation of structures under earthquake loading

Inelastic spectra to predict period elongation of structures under earthquake loading

Selection of Ground Motions for Response History Analysis

Seismically induced uplift effects on nuclear power plants. Part 1: Containment building rocking spectra

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