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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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 |
_version_ |
1716215134628610048 |