Procedure and Spectra for Analysis of Rc Structures Subjected to Strong Vertical Earthquake Loads

Elnashai, Amr S.; Papazoglou, Athanasios

doi:10.1080/13632469708962364

Cited by 90 publications

(62 citation statements)

References 9 publications

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“…See Table 1 * For these models, the paper does not make it clear whether the PGA values have been taken directly from recordings or inferred from the spectral acceleration at a very short response period (e.g., 0.01 s) cal direction may be much smaller than in the horizontal direction (Elnashai and Papazoglu 1997). Within the framework of PSHA, it is now generally regarded more appropriate to obtain vertical response spectra by applying vertical-to-horizontal (V/H) ratios to the horizontal spectra rather than conducting hazard calculations directly in terms of the vertical accelerations (e.g., Gülerce and Abrahamson 2011;Bommer et al 2011a).…”

Section: T) Unevenmentioning

confidence: 99%

Extending ground-motion prediction equations for spectral accelerations to higher response frequencies

Bommer

Akkar

Drouet³

2011

Bull Earthquake Eng

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Ground-motion prediction equations (GMPEs) for spectral accelerations have traditionally focused on the range of response periods most closely associated with the dynamic characteristics of buildings. Providing predictions only in this period range (from 0.1 to 2 or 3 s) has also accommodated the assumed limitations on the usable period range resulting from the processing of accelerograms. There are, however, engineering applications for which estimates of spectral ordinates are required at shorter response periods. Recent work has demonstrated that high-frequency spectral ordinates are relatively insensitive to record processing, contrary to previous assumptions. In the light of this finding, additional regressions are performed to extend a recent pan-European GMPE to higher response frequencies. This model and others that also include coefficients for spectral ordinates at several high response frequencies are used to explore options for interpolating coefficients for equations that do not provide good coverage in this range. The challenges and uncertainties associated with such interpolations are discussed. The paper concludes that a set of standard response frequencies could be usefully established for future GMPEs.

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Section: T) Unevenmentioning

confidence: 99%

Extending ground-motion prediction equations for spectral accelerations to higher response frequencies

Bommer

Akkar

Drouet³

2011

Bull Earthquake Eng

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“…Outside these points, the section is still subjected to a vertical acceleration as the result of the #exural response. This component of the acceleration, smaller than the impulsive one at bending reversal, is found as the second derivative of equation (3). Its maximum value is…”

Section: Simple Mechanical Model For Axial Vibrationsmentioning

confidence: 99%

Vertical oscillations due to axial-bending coupling during seismic response of RC bridge piers

Ranzo

Petrangeli

Pinto

1999

Earthquake Engng. Struct. Dyn.

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SUMMARYThe paper presents a numerical investigation on the behaviour of reinforced concrete bridge piers subjected to horizontal seismic input. Scope of the investigations is to quantify the phenomenon of bending-induced axial vibrations. The results of a set of analyses conducted on single-column bent systems indicate that #exural cracking produces, in fact, signi"cant axial vibrations. This e!ect is particularly relevant in squat elements with low axial force where the sway of the cross-sectional neutral axis under alternate bending causes strong hammering impulses at crack closure. Quanti"cation of the e!ects related to this phenomenon can be determinant for the seismic assessment of existing bridges as well as for the design of new bridges. Likewise, performance and design forces of bearings and other anti-seismic devices can be estimated with more accuracy, based on the expected level of combined vertical and horizontal acceleration response on decks. The pier overall #exural response is not signi"cantly altered by the #uctuation in axial force associated to these impulses, although local moment}curvature behaviour is, due to axial}bending interaction. Shear resisting mechanisms should be more sensitive to these vibrations and shear failure anticipated when a reduction in the axial contribution to the section shear capacity occurs. A tentative equation for the prediction of this #exural-induced vertical acceleration component is proposed based on simpli"ed section kinematics and elastic impact analysis.

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“…The vertical response spectrum recommended in Part 1 of EN-Eurocode 8 is based on work and data specific to Europe Elnashai and Papazoglou 1997).…”

Section: Elastic Response Spectra Of the Vertical Seismic Action Compmentioning

confidence: 99%

European Structural Design Codes: Seismic Actions

Fardis

2014

Encyclopedia of Earthquake Engineering

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Procedure and Spectra for Analysis of Rc Structures Subjected to Strong Vertical Earthquake Loads

Cited by 90 publications

References 9 publications

Extending ground-motion prediction equations for spectral accelerations to higher response frequencies

Extending ground-motion prediction equations for spectral accelerations to higher response frequencies

Vertical oscillations due to axial-bending coupling during seismic response of RC bridge piers

European Structural Design Codes: Seismic Actions

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