Seismic response of cable stayed bridges under multi support excitation

In this Study, the seismic response of cable stayed bridges have been evaluated under multi-support excitations. There are three sources that cause the earthquake wave characteristics change during its propagation path. Local site effect, loss of coherency and wave passage effect are three sources o...

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Main Authors: Mahmoud Reza ُُShiravand, Parsa Parvanehro, Sina Bagheri
Format: Article
Language:fas
Published: Iranian Society of Structrual Engineering (ISSE) 2017-07-01
Series:Journal of Structural and Construction Engineering
Subjects:
Online Access:http://www.jsce.ir/article_46859_f60f422a816eaf169ce7388da3a14b94.pdf
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spelling doaj-87c5fd32c8394addb40874e9f92113302020-11-25T00:10:10ZfasIranian Society of Structrual Engineering (ISSE)Journal of Structural and Construction Engineering2476-39772538-26162017-07-014شماره ویژه 1586910.22065/jsce.2017.87901.121646859Seismic response of cable stayed bridges under multi support excitationMahmoud Reza ُُShiravand0Parsa Parvanehro1Sina Bagheri2Assistant Professor, Department of Civil Engineering, Shahid Beheshti University, Tehran, IranPhD student in Earthquake Engineering, Civil and Environmental Engineering Department, Shahid Beheshti University, Tehran, IranMSc of Earthquake Engineering, Civil and Environmental Engineering Department, Shahid Beheshti University, Tehran, IranIn this Study, the seismic response of cable stayed bridges have been evaluated under multi-support excitations. There are three sources that cause the earthquake wave characteristics change during its propagation path. Local site effect, loss of coherency and wave passage effect are three sources of spatial variation of seismic ground motions. In long span structures, such as cable supported bridges, this phenomenon is more evident and traditional analyzing (uniform excitation) may not be valid and be conservative. Thus, it is necessary to investigate the response of cable stayed bridges under non-uniform excitations. For this purpose, the non-uniform time histories were artificially generated using Kriging method based on a set of known time history in the west support of bridge. Nonlinear time history analysis was performed and cables axial force, deck moment, pylons moment and finally drift ratio of bridge have been examined in order to investigate how non-uniform excitation change the seismic response of bridge compared with uniform excitations. Results show non-uniform excitation in some bridge components increase responses and decreases in the others. In non-uniform excitation, although total time history energy is lesser than uniform excitation, it can significantly change the distribution of the forces and makes differential displacement between cables supports and increase the possibility of failure.http://www.jsce.ir/article_46859_f60f422a816eaf169ce7388da3a14b94.pdfMulti-Support ExcitationCable stayed bridgeKriging methodSpatial Variation of Ground MotionEarthquake
collection DOAJ
language fas
format Article
sources DOAJ
author Mahmoud Reza ُُShiravand
Parsa Parvanehro
Sina Bagheri
spellingShingle Mahmoud Reza ُُShiravand
Parsa Parvanehro
Sina Bagheri
Seismic response of cable stayed bridges under multi support excitation
Journal of Structural and Construction Engineering
Multi-Support Excitation
Cable stayed bridge
Kriging method
Spatial Variation of Ground Motion
Earthquake
author_facet Mahmoud Reza ُُShiravand
Parsa Parvanehro
Sina Bagheri
author_sort Mahmoud Reza ُُShiravand
title Seismic response of cable stayed bridges under multi support excitation
title_short Seismic response of cable stayed bridges under multi support excitation
title_full Seismic response of cable stayed bridges under multi support excitation
title_fullStr Seismic response of cable stayed bridges under multi support excitation
title_full_unstemmed Seismic response of cable stayed bridges under multi support excitation
title_sort seismic response of cable stayed bridges under multi support excitation
publisher Iranian Society of Structrual Engineering (ISSE)
series Journal of Structural and Construction Engineering
issn 2476-3977
2538-2616
publishDate 2017-07-01
description In this Study, the seismic response of cable stayed bridges have been evaluated under multi-support excitations. There are three sources that cause the earthquake wave characteristics change during its propagation path. Local site effect, loss of coherency and wave passage effect are three sources of spatial variation of seismic ground motions. In long span structures, such as cable supported bridges, this phenomenon is more evident and traditional analyzing (uniform excitation) may not be valid and be conservative. Thus, it is necessary to investigate the response of cable stayed bridges under non-uniform excitations. For this purpose, the non-uniform time histories were artificially generated using Kriging method based on a set of known time history in the west support of bridge. Nonlinear time history analysis was performed and cables axial force, deck moment, pylons moment and finally drift ratio of bridge have been examined in order to investigate how non-uniform excitation change the seismic response of bridge compared with uniform excitations. Results show non-uniform excitation in some bridge components increase responses and decreases in the others. In non-uniform excitation, although total time history energy is lesser than uniform excitation, it can significantly change the distribution of the forces and makes differential displacement between cables supports and increase the possibility of failure.
topic Multi-Support Excitation
Cable stayed bridge
Kriging method
Spatial Variation of Ground Motion
Earthquake
url http://www.jsce.ir/article_46859_f60f422a816eaf169ce7388da3a14b94.pdf
work_keys_str_mv AT mahmoudrezashiravand seismicresponseofcablestayedbridgesundermultisupportexcitation
AT parsaparvanehro seismicresponseofcablestayedbridgesundermultisupportexcitation
AT sinabagheri seismicresponseofcablestayedbridgesundermultisupportexcitation
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