Anti-symmetric mode excitation and seismic response of base-isolated bridges under asynchronous input motion.
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| Title: | Anti-symmetric mode excitation and seismic response of base-isolated bridges under asynchronous input motion. |
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| Authors: | Papadopoulos, Savvas P.1 savvaspp@civil.auth.gr, Sextos, Anastasios G.1,2 asextos@civil.auth.gr |
| Source: | Soil Dynamics & Earthquake Engineering (0267-7261). Oct2018, Vol. 113, p148-161. 14p. |
| Subjects: | Transverse stiffeners, Asynchronous transfer mode, Symmetric games, Bending moment, Symmetric matrices |
| Abstract: | Abstract This paper investigates the effect of asynchronous earthquake ground motion on the transverse response of base-isolated bridges. In this context, the excitation of anti-symmetric modes of vibration under asynchronous input is examined and is statistically correlated with characteristic engineering demand parameters. Different ground motion scenarios are considered for various combinations of soil class, wave propagation velocity and loss of correlation patterns among different support motions, using a spectral representation method to generate m-variate, fully non-stationary, EC8 spectrum-compatible ground motion vector processes. It is shown that in the idealised case of the wave passage effect only, the detrimental effects of asynchronous excitation are concentrated on the very last piers along the direction of the seismic waves. However, when loss of coherency is also taken into account in a more realistic scenario, the impact of spatial variability is significantly more uniformly distributed. Most importantly, the conditional probability of a detrimental increase in an EDP of interest (i.e., pier base bending moments and deck drift) under multi-support excitation given that an anti-symmetric mode is excited is not only uniform but also considerably high. This is a clear evidence that the local increase of seismic demand in the bridge studied is associated with the excitation of the first anti-symmetric mode of vibration. Highlights • Excitation of anti-symmetric modes under asynchronous seismic motion is investigated. • Synthetic fully non-stationary EC8 spectrum compatible ground motions are generated. • The excitation of higher modes is key in increasing seismic demand. [ABSTRACT FROM AUTHOR] |
| Copyright of Soil Dynamics & Earthquake Engineering (0267-7261) is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 131806837 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Anti-symmetric mode excitation and seismic response of base-isolated bridges under asynchronous input motion. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Papadopoulos%2C+Savvas+P%2E%22">Papadopoulos, Savvas P.</searchLink><relatesTo>1</relatesTo><i> savvaspp@civil.auth.gr</i><br /><searchLink fieldCode="AR" term="%22Sextos%2C+Anastasios+G%2E%22">Sextos, Anastasios G.</searchLink><relatesTo>1,2</relatesTo><i> asextos@civil.auth.gr</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Soil+Dynamics+%26+Earthquake+Engineering+%280267-7261%29%22">Soil Dynamics & Earthquake Engineering (0267-7261)</searchLink>. Oct2018, Vol. 113, p148-161. 14p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Transverse+stiffeners%22">Transverse stiffeners</searchLink><br /><searchLink fieldCode="DE" term="%22Asynchronous+transfer+mode%22">Asynchronous transfer mode</searchLink><br /><searchLink fieldCode="DE" term="%22Symmetric+games%22">Symmetric games</searchLink><br /><searchLink fieldCode="DE" term="%22Bending+moment%22">Bending moment</searchLink><br /><searchLink fieldCode="DE" term="%22Symmetric+matrices%22">Symmetric matrices</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract This paper investigates the effect of asynchronous earthquake ground motion on the transverse response of base-isolated bridges. In this context, the excitation of anti-symmetric modes of vibration under asynchronous input is examined and is statistically correlated with characteristic engineering demand parameters. Different ground motion scenarios are considered for various combinations of soil class, wave propagation velocity and loss of correlation patterns among different support motions, using a spectral representation method to generate m-variate, fully non-stationary, EC8 spectrum-compatible ground motion vector processes. It is shown that in the idealised case of the wave passage effect only, the detrimental effects of asynchronous excitation are concentrated on the very last piers along the direction of the seismic waves. However, when loss of coherency is also taken into account in a more realistic scenario, the impact of spatial variability is significantly more uniformly distributed. Most importantly, the conditional probability of a detrimental increase in an EDP of interest (i.e., pier base bending moments and deck drift) under multi-support excitation given that an anti-symmetric mode is excited is not only uniform but also considerably high. This is a clear evidence that the local increase of seismic demand in the bridge studied is associated with the excitation of the first anti-symmetric mode of vibration. Highlights • Excitation of anti-symmetric modes under asynchronous seismic motion is investigated. • Synthetic fully non-stationary EC8 spectrum compatible ground motions are generated. • The excitation of higher modes is key in increasing seismic demand. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Soil Dynamics & Earthquake Engineering (0267-7261) is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.soildyn.2018.06.004 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 14 StartPage: 148 Subjects: – SubjectFull: Transverse stiffeners Type: general – SubjectFull: Asynchronous transfer mode Type: general – SubjectFull: Symmetric games Type: general – SubjectFull: Bending moment Type: general – SubjectFull: Symmetric matrices Type: general Titles: – TitleFull: Anti-symmetric mode excitation and seismic response of base-isolated bridges under asynchronous input motion. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Papadopoulos, Savvas P. – PersonEntity: Name: NameFull: Sextos, Anastasios G. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2018 Type: published Y: 2018 Identifiers: – Type: issn-print Value: 02677261 Numbering: – Type: volume Value: 113 Titles: – TitleFull: Soil Dynamics & Earthquake Engineering (0267-7261) Type: main |
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