Evaluation of Suspension Bridge Main Cables

2015 ◽  
pp. 122-155
Keyword(s):  
Suspension Bridge ◽  
Main Cables

scholarly journals Probabilistic Assessment of the Safety of Main Cables for Long-Span Suspension Bridges considering Corrosion Effects

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Hao Tian ◽  
Jiji Wang ◽  
Sugong Cao ◽  
Yuanli Chen ◽  
Luwei Li
Keyword(s):  
Probability Model ◽  
Steel Wire ◽  
Suspension Bridge ◽  
Element Model ◽  
Traffic Load ◽  
Suspension Bridges ◽  
Accelerated Corrosion ◽  
Long Span ◽  
Accelerated Corrosion Tests ◽  
Main Cables

This paper presents a reliability analysis to assess the safety of corroded main cables of a long-span suspension bridge. A multiscale probability model was established for the resistance of the main cables considering the length effect and the Daniels effect. Corrosion effects were considered in the wire scale by relating the test results from accelerated corrosion tests to the corrosion stages and in the cable scale by adopting a corrosion stage distribution of the main cable section in NCHRP Report 534. The load effects of temperature, wind load, and traffic load were obtained by solving a finite element model with inputs from in-service monitoring data. The so-obtained reliability index of the main cables reduces significantly after operation for over 50 years and falls below the design target value due to corrosion effects on the mechanical properties of the steel wire. Multiple measures should be taken to delay the corrosion effects and ensure the safety of the main cables in the design service life.

scholarly journals Parametric Study on Responses of a Self-Anchored Suspension Bridge to Sudden Breakage of a Hanger

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Wenliang Qiu ◽  
Meng Jiang ◽  
Cailiang Huang
Keyword(s):  
Suspension Bridge ◽  
Element Model ◽  
Dynamic Responses ◽  
Flexural Stiffness ◽  
Static And Dynamic Analysis ◽  
Main Cable ◽  
Reaction Forces ◽  
Internal Forces ◽  
Torsion Stiffness ◽  
Main Cables

The girder of self-anchored suspension bridge is subjected to large compression force applied by main cables. So, serious damage of the girder due to breakage of hangers may cause the collapse of the whole bridge. With the time increasing, the hangers may break suddenly for their resistance capacities decrease due to corrosion. Using nonlinear static and dynamic analysis methods and adopting 3D finite element model, the responses of an actual self-anchored suspension bridge to sudden breakage of hangers are studied in this paper. The results show that the sudden breakage of a hanger causes violent vibration and large changes in internal forces of the bridge. In the process of the vibration, the maximum tension of hanger produced by breakage of a hanger exceeds 2.22 times its initial value, and the reaction forces of the bearings increase by more than 1.86 times the tension of the broken hanger. Based on the actual bridge, the influences of some factors including flexural stiffness of girder, torsion stiffness of girder, flexural stiffness of main cable, weight of girder, weight of main cable, span to sag ratio of main cable, distance of hangers, span length, and breakage time of hanger on the dynamic responses are studied in detail, and the influencing extent of the factors is presented.

scholarly journals Wind-Induced Vibration Response of an Inspection Vehicle for Main Cables Based on Computer Simulation

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Lu Zhang ◽  
Shaohua Wang ◽  
Peng Guo ◽  
Qunsheng Wang
Keyword(s):  
Finite Element ◽  
Wind Speed ◽  
Ride Comfort ◽  
Suspension Bridge ◽  
Vibration Response ◽  
Fe Model ◽  
Main Cable ◽  
Main Cables ◽  
Wind Induced Vibration ◽  
Wind Induced Vibration Response

This paper presents a simulation approach based on the finite element method (FEM) to analyze the wind-induced vibration response of an inspection vehicle for main cables. First, two finite element (FE) models of a suspension bridge and a main cable-inspection vehicle coupled system are established using MIDAS Civil software and ANSYS software, respectively. Second, the mean wind speed distribution characteristics at a bridge site are analyzed, and the wind field is simulated based on the spectral representation method (SRM). Third, a modal analysis and a wind-induced vibration response transient analysis of the suspension bridge FE model are completed. Fourth, the vibration characteristics of the inspection vehicle are analyzed by applying fluctuating wind conditions and main cable vibration displacements in the main cable-inspection vehicle coupled FE model. Finally, based on the ISO2631-1-1997 standard, a vehicle ride comfort evaluation is performed. The results of the suspension bridge FE modal analysis are in good accordance with those of the experimental modal test. The effects of the working height, number of nonworking compressing wheels, and number of nonworking driving wheels during driving are discussed. When the average wind speed is less than 13.3 m/s, the maximum total weighted root mean square acceleration (av) is 0.1646 m/s2 and the vehicle ride comfort level is classified as “not uncomfortable.” This approach provides a foundation for the design and application of inspection vehicles.

Main Cables of Newport Suspension Bridge

1971 ◽  
Vol 97 (12) ◽  
pp. 2825-2835
Author(s):  
Blair Birdsall
Keyword(s):  
Suspension Bridge ◽  
Main Cables

La Florida Suspension Bridge. Oviedo, Spain

2016 ◽  
Author(s):  
Juan José Arenas ◽  
Guillermo Capellán ◽  
Alejandro Godoy ◽  
Marianela García ◽  
Juan Ruiz ◽  
...  
Keyword(s):  
Suspension Bridge ◽  
Suspension System ◽  
City Council ◽  
Final Design ◽  
La Florida ◽  
Main Cables ◽  
Concrete Deck ◽  
Concrete Ring ◽  
Post Tensioned

La Florida Bridge is a €5,9 million project promoted by Oviedo City Council to provide a new link between “La Florida” and “Western Park” neighbourhoods. The final design, developed by Arenas & Asociados, represents an innovation in urban bridges, solving the connection between both areas with a flying semi-circle roundabout suspended from its inner edge by a system of hangers.<p> The main novelty of this solution is that hangers and backstays are fixed to the same suspension system, composed by two main cables making a loop and anchored to an articulated mast. The structure is completed with a post-tensioned concrete approach viaduct, a composite connection span between roundabout and viaduct, two cantilever footbridges arising from the concrete deck and flying parallel to the roundabout, and finally, a concrete ring as counterweight for the backstays anchorage. K

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