Effect of Near-Fault Vertical Ground Motions on the Seismic Response of Bridges with Rocking Foundations

El-Hawat, O; Fatahi, B; Mostafa, M

Effect of Near-Fault Vertical Ground Motions on the Seismic Response of Bridges with Rocking Foundations

El-Hawat, O Fatahi, B

Mostafa, M

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Publisher:: Springer
Publication Type:: Conference Proceeding
Citation:: Seismic Design and Performance, 2021, 120 LNCE, pp. 95-107
Issue Date:: 2021-01-01

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Field	Value	Language
dc.contributor.author	El-Hawat, O
dc.contributor.author	Fatahi, B https://orcid.org/0000-0002-7920-6946
dc.contributor.author	Mostafa, M
dc.date	2020-07-13
dc.date.accessioned	2022-06-24T01:15:20Z
dc.date.available	2022-06-24T01:15:20Z
dc.date.issued	2021-01-01
dc.identifier.citation	Seismic Design and Performance, 2021, 120 LNCE, pp. 95-107
dc.identifier.isbn	9789813340046
dc.identifier.issn	2366-2557
dc.identifier.issn	2366-2565
dc.identifier.uri	http://hdl.handle.net/10453/158343
dc.description.abstract	Rocking foundations can be used in bridges to reduce the seismic demand of the structure and prevent inelastic behaviour from developing at the piers during large earthquake events. Several studies have proven that rocking is an effective seismic isolation technique under lateral earthquake loading. However, limited research has been conducted on the effect of the vertical component of earthquakes on the rocking behaviour of bridge piers. This paper aims to numerically investigate the effect of the vertical component of near-fault earthquakes on the seismic performance of bridges with rocking pile foundations. Two identical bridge configurations with different foundation systems (conventional fixed base foundation and rocking foundation) are subjected to two loading cases: (1) horizontal ground motions only, (2) combined horizontal and vertical ground motions. Three-dimensional models of the bridges are developed with the appropriate material models to capture possible inelastic behaviour, as well as to model the soil–structure interaction. Four near-fault ground motions with three components are selected and scaled to the appropriate seismic hazard and applied to the bridges using nonlinear dynamic time history analyses. The dynamic responses of the bridges are compared in terms of deck displacements, deck bending moments, and pier axial and bending moments. The results show that the vertical component of ground motions can considerably increase the dynamic response of the bridge with the rocking foundation when compared to the fixed base foundation, leading to increased deck displacements and inertial actions on the bridge structure.
dc.language	en
dc.publisher	Springer
dc.relation.ispartof	Seismic Design and Performance
dc.relation.ispartof	International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
dc.relation.ispartofseries	Lecture Notes in Civil Engineering
dc.relation.isbasedon	10.1007/978-981-33-4005-3_8
dc.rights	info:eu-repo/semantics/closedAccess
dc.title	Effect of Near-Fault Vertical Ground Motions on the Seismic Response of Bridges with Rocking Foundations
dc.type	Conference Proceeding
utslib.citation.volume	120 LNCE
utslib.location.activity	Bangalore, India
utslib.for	0403 Geology
utslib.for	0905 Civil Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2022-06-24T01:15:19Z
pubs.finish-date	2020-07-16
pubs.place-of-publication	Switzerland
pubs.publication-status	Published
pubs.start-date	2020-07-13
pubs.volume	120 LNCE
dc.location	Switzerland

Abstract:

Rocking foundations can be used in bridges to reduce the seismic demand of the structure and prevent inelastic behaviour from developing at the piers during large earthquake events. Several studies have proven that rocking is an effective seismic isolation technique under lateral earthquake loading. However, limited research has been conducted on the effect of the vertical component of earthquakes on the rocking behaviour of bridge piers. This paper aims to numerically investigate the effect of the vertical component of near-fault earthquakes on the seismic performance of bridges with rocking pile foundations. Two identical bridge configurations with different foundation systems (conventional fixed base foundation and rocking foundation) are subjected to two loading cases: (1) horizontal ground motions only, (2) combined horizontal and vertical ground motions. Three-dimensional models of the bridges are developed with the appropriate material models to capture possible inelastic behaviour, as well as to model the soil–structure interaction. Four near-fault ground motions with three components are selected and scaled to the appropriate seismic hazard and applied to the bridges using nonlinear dynamic time history analyses. The dynamic responses of the bridges are compared in terms of deck displacements, deck bending moments, and pier axial and bending moments. The results show that the vertical component of ground motions can considerably increase the dynamic response of the bridge with the rocking foundation when compared to the fixed base foundation, leading to increased deck displacements and inertial actions on the bridge structure.

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http://hdl.handle.net/10453/158343