Effects Of Cable Diameter Reduction And Snapping On The Behavior Of Cable-Stayed Bridges

Cable–stayed bridges are usually constructed in coastal area in which the surrounding atmospheric is considered as severe environmental condition. This atmosphere helps in building up quickly the corrosion of steel cables with time. Visual inspection of cable-stayed bridges built up worldwide shows...

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Main Author:	Ajaj, Sayed Mahamed
Format:	Thesis
Language:	English English
Published:	2007
Subjects:	Bridges railings Bridges - Malaysia - case studies
Online Access:	http://psasir.upm.edu.my/id/eprint/5206/1/FK_2007_26.pdf
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spelling	my-upm-ir.52062013-05-27T07:21:09Z Effects Of Cable Diameter Reduction And Snapping On The Behavior Of Cable-Stayed Bridges 2007 Ajaj, Sayed Mahamed Cable–stayed bridges are usually constructed in coastal area in which the surrounding atmospheric is considered as severe environmental condition. This atmosphere helps in building up quickly the corrosion of steel cables with time. Visual inspection of cable-stayed bridges built up worldwide shows that the bridge cables suffer from serious corrosion although the cables are protected using different techniques. There is a considerable reduction in cable diameter due to corrosion, which depends on the severity of the environmental condition. There is no sufficient information regarding the effect of reduction in cable diameter on the structural response of cable-stayed bridge. Furthermore, snapping of cables due to accidental and /or corrosion is another important issue which affecting the structural response and safety of cable stayed bridges and need to be addressed for safe design.In this research, the effect of reducing cables diameter, cables layout and snapping of individual cables on the structural behavior and safety of cable-stayed bridge are presented. Three cable layouts are analyzed in this study i.e. harp, semi harp and fan layouts. In each layout, five different reductions in cables diameters are considered i.e 12.50%, 25.00%, 37.50%, and 50.00%. To address snapping of cable, harp bridge layout is considered and the structural behavior of the bridge due to snapping individual cables in the bridge are presented and discussed. The analysis starts with initial shape analysis to stress the cables to minimize the deformation under self-weight of the structure. The analysis was carried out using stiffness method considering the geometrical nonlinearities. The results of initial shape analysis show that in all bridge layouts reflect comparable behavior. The cable forces were found to be the lowest in fan layout cable bridge compared to harp and semi harp layouts. Reducing cables diameter will lead to a redistribution of forces and moment in different components of the bridge and alter the structural behavior in a nonlinear fashion. Reducing cables diameter by 25% will compromise the bridge safety as the stresses in cables, deformation, and bending moment will be increased significantly. The bridge cable layouts have little effect on the structure response of the cable-stayed bridge with reduced cables diameter. The fan layout shows better structural response compared to harp and semi harp layout, especially in term of cable forces and deformation profile. Notwithstanding this fact, 25% of cables reduction diameter will significantly affect the moment in girder of fan bridge layout compared to other layouts of cables Snapping the individual cable in the bridge has a significant effect on the cable force and bending moment distribution in the girder, tower and will cause bridge failure. Bridges railings Bridges - Malaysia - case studies 2007 Thesis http://psasir.upm.edu.my/id/eprint/5206/ http://psasir.upm.edu.my/id/eprint/5206/1/FK_2007_26.pdf application/pdf en public masters Universiti Putra Malaysia Bridges railings Bridges - Malaysia - case studies Faculty of Engineering English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Bridges railings Bridges - Malaysia - case studies
spellingShingle	Bridges railings Bridges - Malaysia - case studies Ajaj, Sayed Mahamed Effects Of Cable Diameter Reduction And Snapping On The Behavior Of Cable-Stayed Bridges
description	Cable–stayed bridges are usually constructed in coastal area in which the surrounding atmospheric is considered as severe environmental condition. This atmosphere helps in building up quickly the corrosion of steel cables with time. Visual inspection of cable-stayed bridges built up worldwide shows that the bridge cables suffer from serious corrosion although the cables are protected using different techniques. There is a considerable reduction in cable diameter due to corrosion, which depends on the severity of the environmental condition. There is no sufficient information regarding the effect of reduction in cable diameter on the structural response of cable-stayed bridge. Furthermore, snapping of cables due to accidental and /or corrosion is another important issue which affecting the structural response and safety of cable stayed bridges and need to be addressed for safe design.In this research, the effect of reducing cables diameter, cables layout and snapping of individual cables on the structural behavior and safety of cable-stayed bridge are presented. Three cable layouts are analyzed in this study i.e. harp, semi harp and fan layouts. In each layout, five different reductions in cables diameters are considered i.e 12.50%, 25.00%, 37.50%, and 50.00%. To address snapping of cable, harp bridge layout is considered and the structural behavior of the bridge due to snapping individual cables in the bridge are presented and discussed. The analysis starts with initial shape analysis to stress the cables to minimize the deformation under self-weight of the structure. The analysis was carried out using stiffness method considering the geometrical nonlinearities. The results of initial shape analysis show that in all bridge layouts reflect comparable behavior. The cable forces were found to be the lowest in fan layout cable bridge compared to harp and semi harp layouts. Reducing cables diameter will lead to a redistribution of forces and moment in different components of the bridge and alter the structural behavior in a nonlinear fashion. Reducing cables diameter by 25% will compromise the bridge safety as the stresses in cables, deformation, and bending moment will be increased significantly. The bridge cable layouts have little effect on the structure response of the cable-stayed bridge with reduced cables diameter. The fan layout shows better structural response compared to harp and semi harp layout, especially in term of cable forces and deformation profile. Notwithstanding this fact, 25% of cables reduction diameter will significantly affect the moment in girder of fan bridge layout compared to other layouts of cables Snapping the individual cable in the bridge has a significant effect on the cable force and bending moment distribution in the girder, tower and will cause bridge failure.
format	Thesis
qualification_level	Master's degree
author	Ajaj, Sayed Mahamed
author_facet	Ajaj, Sayed Mahamed
author_sort	Ajaj, Sayed Mahamed
title	Effects Of Cable Diameter Reduction And Snapping On The Behavior Of Cable-Stayed Bridges
title_short	Effects Of Cable Diameter Reduction And Snapping On The Behavior Of Cable-Stayed Bridges
title_full	Effects Of Cable Diameter Reduction And Snapping On The Behavior Of Cable-Stayed Bridges
title_fullStr	Effects Of Cable Diameter Reduction And Snapping On The Behavior Of Cable-Stayed Bridges
title_full_unstemmed	Effects Of Cable Diameter Reduction And Snapping On The Behavior Of Cable-Stayed Bridges
title_sort	effects of cable diameter reduction and snapping on the behavior of cable-stayed bridges
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Engineering
publishDate	2007
url	http://psasir.upm.edu.my/id/eprint/5206/1/FK_2007_26.pdf
_version_	1747810373391613952

Effects Of Cable Diameter Reduction And Snapping On The Behavior Of Cable-Stayed Bridges

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