Rotational seismic excitation effects on CIDH pile-supported bridge piers.
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| Title: | Rotational seismic excitation effects on CIDH pile-supported bridge piers. |
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| Authors: | Mylona, Elli-Konstantina V.1, Sextos, Anastasios G.1,2 asextos@civil.auth.gr, Mylonakis, George E.2,3,4 g.mylonakis@bristol.ac.uk |
| Source: | Engineering Structures. May2017, Vol. 138, p181-194. 14p. |
| Subjects: | Bridge foundations & piers, Pile bridges, Flexibility (Mechanics), Shear waves, Stiffness (Mechanics), Displacement (Mechanics) |
| Abstract: | This paper investigates the response of bridges founded on single, cast-in-drilled-hole (CIDH) piles under combined translational and rotational excitation. The input motion stems from kinematic interaction - a result of the relative flexibility between pile and soil - and subsequent pile bending, under the passage of vertically propagating seismic shear waves. The rotational component of seismic excitation is typically ignored in analysis and design, and it is not prescribed in modern seismic codes. More importantly, the significance of this effect on the response of pile-supported bridges has not been quantified and is presently poorly understood. Along these lines, a simple framework is presented in this paper for studying parametrically: (a) the salient features of the rotational excitation component and (b) the seismic demand imposed on the superstructure. For this purpose, multiple MDOF oscillators representing typical bridge piers of different heights, founded on soils of different stiffness, are considered, subjected to a variety of harmonic signals and recorded earthquake motions. The displacement demands on the superstructure are compared to corresponding displacements obtained under exclusively translational excitation. It is concluded that the kinematically-induced rotational excitation may significantly increase deck displacements (by a factor of 2 or more depending on the circumstances), especially close to resonant frequencies associated with the dynamic characteristics of the soil and the superstructure. [ABSTRACT FROM AUTHOR] |
| Copyright of Engineering Structures 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: 121619446 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Rotational seismic excitation effects on CIDH pile-supported bridge piers. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Mylona%2C+Elli-Konstantina+V%2E%22">Mylona, Elli-Konstantina V.</searchLink><relatesTo>1</relatesTo><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><br /><searchLink fieldCode="AR" term="%22Mylonakis%2C+George+E%2E%22">Mylonakis, George E.</searchLink><relatesTo>2,3,4</relatesTo><i> g.mylonakis@bristol.ac.uk</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Engineering+Structures%22">Engineering Structures</searchLink>. May2017, Vol. 138, p181-194. 14p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Bridge+foundations+%26+piers%22">Bridge foundations & piers</searchLink><br /><searchLink fieldCode="DE" term="%22Pile+bridges%22">Pile bridges</searchLink><br /><searchLink fieldCode="DE" term="%22Flexibility+%28Mechanics%29%22">Flexibility (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Shear+waves%22">Shear waves</searchLink><br /><searchLink fieldCode="DE" term="%22Stiffness+%28Mechanics%29%22">Stiffness (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Displacement+%28Mechanics%29%22">Displacement (Mechanics)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: This paper investigates the response of bridges founded on single, cast-in-drilled-hole (CIDH) piles under combined translational and rotational excitation. The input motion stems from kinematic interaction - a result of the relative flexibility between pile and soil - and subsequent pile bending, under the passage of vertically propagating seismic shear waves. The rotational component of seismic excitation is typically ignored in analysis and design, and it is not prescribed in modern seismic codes. More importantly, the significance of this effect on the response of pile-supported bridges has not been quantified and is presently poorly understood. Along these lines, a simple framework is presented in this paper for studying parametrically: (a) the salient features of the rotational excitation component and (b) the seismic demand imposed on the superstructure. For this purpose, multiple MDOF oscillators representing typical bridge piers of different heights, founded on soils of different stiffness, are considered, subjected to a variety of harmonic signals and recorded earthquake motions. The displacement demands on the superstructure are compared to corresponding displacements obtained under exclusively translational excitation. It is concluded that the kinematically-induced rotational excitation may significantly increase deck displacements (by a factor of 2 or more depending on the circumstances), especially close to resonant frequencies associated with the dynamic characteristics of the soil and the superstructure. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Engineering Structures 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.engstruct.2017.01.071 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 14 StartPage: 181 Subjects: – SubjectFull: Bridge foundations & piers Type: general – SubjectFull: Pile bridges Type: general – SubjectFull: Flexibility (Mechanics) Type: general – SubjectFull: Shear waves Type: general – SubjectFull: Stiffness (Mechanics) Type: general – SubjectFull: Displacement (Mechanics) Type: general Titles: – TitleFull: Rotational seismic excitation effects on CIDH pile-supported bridge piers. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Mylona, Elli-Konstantina V. – PersonEntity: Name: NameFull: Sextos, Anastasios G. – PersonEntity: Name: NameFull: Mylonakis, George E. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: May2017 Type: published Y: 2017 Identifiers: – Type: issn-print Value: 01410296 Numbering: – Type: volume Value: 138 Titles: – TitleFull: Engineering Structures Type: main |
| ResultId | 1 |
