Simplified design of bridges for multiple-support earthquake excitation.
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| Title: | Simplified design of bridges for multiple-support earthquake excitation. |
|---|---|
| Authors: | Papadopoulos, Savvas P.1 (AUTHOR) savvaspp@civil.auth.gr, Sextos, Anastasios G.1,2 (AUTHOR) a.sextos@bristol.ac.uk |
| Source: | Soil Dynamics & Earthquake Engineering (0267-7261). Apr2020, Vol. 131, pN.PAG-N.PAG. 1p. |
| Subjects: | Bridge design & construction, Effect of earthquakes on bridges, Lateral loads, Natural numbers, Pattern matching, Earthquake intensity, Seismic testing |
| Abstract: | This paper presents a novel, bridge-dependent approach for quantifying the increase of design quantities due to spatially variable earthquake ground motion (SVEGM). Contrary to the existing methods for multiple support bridge excitation analysis that are either too complicated to be applied by most practitioners or oversimplied (e.g. Eurocode 8, Annex D provisions), this method aims to strike a balance between simplicity, accuracy and computational efficiency. The method deliberately avoids generating support-dependent, acceleration or displacement, asynchronous inputs for the prediction of bridge response. The reasons behind this decision are twofold: (a) first, the uncertainty associated with the generation of asynchronous motion scenarios, as well as the exact soil properties, stratification and topography is high while, (b) the response of a bridge is particularly sensitive to the above due to the large number of natural modes involved. It is therefore prohibitive to address SVEGM effects deterministically in the framework of a design code. Instead, this new method is based on two important and well-documented observations: (a) that SVEGM is typically globally beneficial but locally detrimental [1], and (b) that the local seismic demand increase is very closely correlated with the excitation of higher modes, which are not normally activated in the case of uniform ground motion [2,3]. Along these lines, a set of static analyses are specified herein to complement the standard, code-based response spectrum analysis. These static analyses apply spatially distributed lateral forces, whose patterns match the shape of potentially excited anti-symmetric modes. The amplitude of those forces is derived as a function of the expected amplification of these modes according to the process initially proposed by Price et al. [4]. Two real bridges with different structural configurations are used as a test-bed to demonstrate the effectiveness of the new method. Comparison of the results with those obtained through rigorous response history analysis using partially correlated, spatially variable, spectrum-compatible input motions [5] shows that, the simplified method presented herein provides a reasonably accurate estimation of the SVEGM impact on the response of the bridges examined at a highly reduced computational cost. This is essentially an elastic method that is found to be simple, yet precise enough to consist an attractive alternative for the design and assessment of long and/or important bridge structures in earthquake-prone regions. • A novel method is presented for accounting for spatial variability of earthquake ground motion in the design of bridges. • Validation of the method is performed for the case of two real bridges. • Results are discussed and seismic code recommendations are made. [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: 142228493 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Simplified design of bridges for multiple-support earthquake excitation. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Papadopoulos%2C+Savvas+P%2E%22">Papadopoulos, Savvas P.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<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> (AUTHOR)<i> a.sextos@bristol.ac.uk</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>. Apr2020, Vol. 131, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Bridge+design+%26+construction%22">Bridge design & construction</searchLink><br /><searchLink fieldCode="DE" term="%22Effect+of+earthquakes+on+bridges%22">Effect of earthquakes on bridges</searchLink><br /><searchLink fieldCode="DE" term="%22Lateral+loads%22">Lateral loads</searchLink><br /><searchLink fieldCode="DE" term="%22Natural+numbers%22">Natural numbers</searchLink><br /><searchLink fieldCode="DE" term="%22Pattern+matching%22">Pattern matching</searchLink><br /><searchLink fieldCode="DE" term="%22Earthquake+intensity%22">Earthquake intensity</searchLink><br /><searchLink fieldCode="DE" term="%22Seismic+testing%22">Seismic testing</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: This paper presents a novel, bridge-dependent approach for quantifying the increase of design quantities due to spatially variable earthquake ground motion (SVEGM). Contrary to the existing methods for multiple support bridge excitation analysis that are either too complicated to be applied by most practitioners or oversimplied (e.g. Eurocode 8, Annex D provisions), this method aims to strike a balance between simplicity, accuracy and computational efficiency. The method deliberately avoids generating support-dependent, acceleration or displacement, asynchronous inputs for the prediction of bridge response. The reasons behind this decision are twofold: (a) first, the uncertainty associated with the generation of asynchronous motion scenarios, as well as the exact soil properties, stratification and topography is high while, (b) the response of a bridge is particularly sensitive to the above due to the large number of natural modes involved. It is therefore prohibitive to address SVEGM effects deterministically in the framework of a design code. Instead, this new method is based on two important and well-documented observations: (a) that SVEGM is typically globally beneficial but locally detrimental [1], and (b) that the local seismic demand increase is very closely correlated with the excitation of higher modes, which are not normally activated in the case of uniform ground motion [2,3]. Along these lines, a set of static analyses are specified herein to complement the standard, code-based response spectrum analysis. These static analyses apply spatially distributed lateral forces, whose patterns match the shape of potentially excited anti-symmetric modes. The amplitude of those forces is derived as a function of the expected amplification of these modes according to the process initially proposed by Price et al. [4]. Two real bridges with different structural configurations are used as a test-bed to demonstrate the effectiveness of the new method. Comparison of the results with those obtained through rigorous response history analysis using partially correlated, spatially variable, spectrum-compatible input motions [5] shows that, the simplified method presented herein provides a reasonably accurate estimation of the SVEGM impact on the response of the bridges examined at a highly reduced computational cost. This is essentially an elastic method that is found to be simple, yet precise enough to consist an attractive alternative for the design and assessment of long and/or important bridge structures in earthquake-prone regions. • A novel method is presented for accounting for spatial variability of earthquake ground motion in the design of bridges. • Validation of the method is performed for the case of two real bridges. • Results are discussed and seismic code recommendations are made. [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.2019.106013 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Bridge design & construction Type: general – SubjectFull: Effect of earthquakes on bridges Type: general – SubjectFull: Lateral loads Type: general – SubjectFull: Natural numbers Type: general – SubjectFull: Pattern matching Type: general – SubjectFull: Earthquake intensity Type: general – SubjectFull: Seismic testing Type: general Titles: – TitleFull: Simplified design of bridges for multiple-support earthquake excitation. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Papadopoulos, Savvas P. – PersonEntity: Name: NameFull: Sextos, Anastasios G. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 04 Text: Apr2020 Type: published Y: 2020 Identifiers: – Type: issn-print Value: 02677261 Numbering: – Type: volume Value: 131 Titles: – TitleFull: Soil Dynamics & Earthquake Engineering (0267-7261) Type: main |
| ResultId | 1 |
