Hanger replacement influence on seismic response of suspension bridges: Implementation to the Bosphorus Bridge subjected to multi-support excitation

Selcuk Bas; Chuan Zhi Dong; Nurdan M. Apaydin; Alper Ilki; F. Necati Catbas

doi:10.1002/eqe.3314

Hanger replacement influence on seismic response of suspension bridges: Implementation to the Bosphorus Bridge subjected to multi-support excitation

Selcuk Bas, Chuan Zhi Dong, Nurdan M. Apaydin, Alper Ilki, F. Necati Catbas^*

^*Corresponding author for this work

Department of Civil Engineering

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

The effects of hanger replacement from inclined to vertical configuration on seismic response of long-span suspension bridges are investigated considering multi-support earthquake excitation. The Bosphorus Bridge is investigated due to its recent comprehensive rehabilitation, mainly involving hanger replacement. The finite-fault stochastic simulation method (FINSIM) is utilized for multi-point earthquake time-history generation. The developed finite element (FE) model both for the inclined and vertical hanger arrangement are verified through the structural health monitoring (SHM) data. Based on the comparative analysis, the tension force of vertical hangers is found to be lower than that of inclined hangers, whereas the tension force of the main and back-stay cables remains the same. The compressive axial force of the deck decreases relatively in the case of the vertical hanger arrangement, whereas the cross-sectional forces at the tower base section increase. The approach viaducts are not affected by the vertical hanger arrangement. According to the demand/capacity ratios for damage estimation under the max. earthquake (2475 years return period), structural damage on the tower base section may be expected for both hanger arrangements, while these sections perform well under design scenario earthquake. The expansion joint of the bridge with inclined hangers is also estimated to be damaged; however, this displacement is lower in the case of the vertical hanger arrangement due to the viscous dampers. The findings also reveal that a change in hanger form of a suspension bridge can necessitate other structural retrofit, such as using viscous dampers to limit longitudinal displacements of the deck and retrofitting the bridge towers.

Original language	English
Pages (from-to)	1496-1518
Number of pages	23
Journal	Earthquake Engineering and Structural Dynamics
Volume	49
Issue number	14
DOIs	https://doi.org/10.1002/eqe.3314
Publication status	Published - 1 Nov 2020

Bibliographical note

Publisher Copyright:
© 2020 John Wiley & Sons, Ltd.

Funding

The authors express their profound gratitude to several engineers and colleagues from General Directorate of Turkish State Highways for providing the useful discussions and suggestions. Besides, the authors greatly appreciate Prof. A. Necmettin Gunduz, Prof. Metin Aydogan, Prof. Kutlu Darilmaz from Istanbul Technical University, and Prof. Dr. Hilmi Lus from Bogazici University for their significant contributions and recommendations. The first author would like to kindly acknowledge The Scientific and Technological Research Council of Turkey (TUBITAK) through grant number 2219. The opinions, findings, and conclusions expressed in this paper are those of the authors and do not necessarily reflect the views of the sponsoring organizations. This work was supported by The Scientific and Technological Research Council of Turkey (TUBITAK) (grant no. 2219) and partially supported by TUBITAK (grant no. 2221). The authors express their profound gratitude to several engineers and colleagues from General Directorate of Turkish State Highways for providing the useful discussions and suggestions. Besides, the authors greatly appreciate Prof. A. Necmettin Gunduz, Prof. Metin Aydogan, Prof. Kutlu Darilmaz from Istanbul Technical University, and Prof. Dr. Hilmi Lus from Bogazici University for their significant contributions and recommendations. The first author would like to kindly acknowledge The Scientific and Technological Research Council of Turkey (TUBITAK) through grant number 2219. The opinions, findings, and conclusions expressed in this paper are those of the authors and do not necessarily reflect the views of the sponsoring organizations.

Funders	Funder number
Bogazici University
TUBITAK	2221, 2219
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu
Istanbul Teknik Üniversitesi

Keywords

finite element model
multi-support earthquake analysis
structural health monitoring (SHM)
suspension bridge
vertical hanger replacement

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10.1002/eqe.3314

Cite this

@article{14da06b54bc24c20ae3e885efde04605,

title = "Hanger replacement influence on seismic response of suspension bridges: Implementation to the Bosphorus Bridge subjected to multi-support excitation",

abstract = "The effects of hanger replacement from inclined to vertical configuration on seismic response of long-span suspension bridges are investigated considering multi-support earthquake excitation. The Bosphorus Bridge is investigated due to its recent comprehensive rehabilitation, mainly involving hanger replacement. The finite-fault stochastic simulation method (FINSIM) is utilized for multi-point earthquake time-history generation. The developed finite element (FE) model both for the inclined and vertical hanger arrangement are verified through the structural health monitoring (SHM) data. Based on the comparative analysis, the tension force of vertical hangers is found to be lower than that of inclined hangers, whereas the tension force of the main and back-stay cables remains the same. The compressive axial force of the deck decreases relatively in the case of the vertical hanger arrangement, whereas the cross-sectional forces at the tower base section increase. The approach viaducts are not affected by the vertical hanger arrangement. According to the demand/capacity ratios for damage estimation under the max. earthquake (2475 years return period), structural damage on the tower base section may be expected for both hanger arrangements, while these sections perform well under design scenario earthquake. The expansion joint of the bridge with inclined hangers is also estimated to be damaged; however, this displacement is lower in the case of the vertical hanger arrangement due to the viscous dampers. The findings also reveal that a change in hanger form of a suspension bridge can necessitate other structural retrofit, such as using viscous dampers to limit longitudinal displacements of the deck and retrofitting the bridge towers.",

keywords = "finite element model, multi-support earthquake analysis, structural health monitoring (SHM), suspension bridge, vertical hanger replacement",

author = "Selcuk Bas and Dong, {Chuan Zhi} and Apaydin, {Nurdan M.} and Alper Ilki and Catbas, {F. Necati}",

note = "Publisher Copyright: {\textcopyright} 2020 John Wiley & Sons, Ltd.",

year = "2020",

month = nov,

day = "1",

doi = "10.1002/eqe.3314",

language = "English",

volume = "49",

pages = "1496--1518",

journal = "Earthquake Engineering and Structural Dynamics",

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Hanger replacement influence on seismic response of suspension bridges: Implementation to the Bosphorus Bridge subjected to multi-support excitation. / Bas, Selcuk; Dong, Chuan Zhi; Apaydin, Nurdan M. et al.
In: Earthquake Engineering and Structural Dynamics, Vol. 49, No. 14, 01.11.2020, p. 1496-1518.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Hanger replacement influence on seismic response of suspension bridges

T2 - Implementation to the Bosphorus Bridge subjected to multi-support excitation

AU - Bas, Selcuk

AU - Dong, Chuan Zhi

AU - Apaydin, Nurdan M.

AU - Ilki, Alper

AU - Catbas, F. Necati

PY - 2020/11/1

Y1 - 2020/11/1

N2 - The effects of hanger replacement from inclined to vertical configuration on seismic response of long-span suspension bridges are investigated considering multi-support earthquake excitation. The Bosphorus Bridge is investigated due to its recent comprehensive rehabilitation, mainly involving hanger replacement. The finite-fault stochastic simulation method (FINSIM) is utilized for multi-point earthquake time-history generation. The developed finite element (FE) model both for the inclined and vertical hanger arrangement are verified through the structural health monitoring (SHM) data. Based on the comparative analysis, the tension force of vertical hangers is found to be lower than that of inclined hangers, whereas the tension force of the main and back-stay cables remains the same. The compressive axial force of the deck decreases relatively in the case of the vertical hanger arrangement, whereas the cross-sectional forces at the tower base section increase. The approach viaducts are not affected by the vertical hanger arrangement. According to the demand/capacity ratios for damage estimation under the max. earthquake (2475 years return period), structural damage on the tower base section may be expected for both hanger arrangements, while these sections perform well under design scenario earthquake. The expansion joint of the bridge with inclined hangers is also estimated to be damaged; however, this displacement is lower in the case of the vertical hanger arrangement due to the viscous dampers. The findings also reveal that a change in hanger form of a suspension bridge can necessitate other structural retrofit, such as using viscous dampers to limit longitudinal displacements of the deck and retrofitting the bridge towers.

AB - The effects of hanger replacement from inclined to vertical configuration on seismic response of long-span suspension bridges are investigated considering multi-support earthquake excitation. The Bosphorus Bridge is investigated due to its recent comprehensive rehabilitation, mainly involving hanger replacement. The finite-fault stochastic simulation method (FINSIM) is utilized for multi-point earthquake time-history generation. The developed finite element (FE) model both for the inclined and vertical hanger arrangement are verified through the structural health monitoring (SHM) data. Based on the comparative analysis, the tension force of vertical hangers is found to be lower than that of inclined hangers, whereas the tension force of the main and back-stay cables remains the same. The compressive axial force of the deck decreases relatively in the case of the vertical hanger arrangement, whereas the cross-sectional forces at the tower base section increase. The approach viaducts are not affected by the vertical hanger arrangement. According to the demand/capacity ratios for damage estimation under the max. earthquake (2475 years return period), structural damage on the tower base section may be expected for both hanger arrangements, while these sections perform well under design scenario earthquake. The expansion joint of the bridge with inclined hangers is also estimated to be damaged; however, this displacement is lower in the case of the vertical hanger arrangement due to the viscous dampers. The findings also reveal that a change in hanger form of a suspension bridge can necessitate other structural retrofit, such as using viscous dampers to limit longitudinal displacements of the deck and retrofitting the bridge towers.

KW - finite element model

KW - multi-support earthquake analysis

KW - structural health monitoring (SHM)

KW - suspension bridge

KW - vertical hanger replacement

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DO - 10.1002/eqe.3314

M3 - Article

AN - SCOPUS:85088105311

SN - 0098-8847

VL - 49

SP - 1496

EP - 1518

JO - Earthquake Engineering and Structural Dynamics

JF - Earthquake Engineering and Structural Dynamics

IS - 14

ER -

Hanger replacement influence on seismic response of suspension bridges: Implementation to the Bosphorus Bridge subjected to multi-support excitation

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