Passive and Adaptive Damping Systems for Vibration Mitigation and Increased Fatigue Service Life of a Tied Arch Railway Bridge

2014 ◽  
Vol 30 (9) ◽  
pp. 748-757 ◽  
Author(s):  
Andreas Andersson ◽  
Alan O'Connor ◽  
Raid Karoumi
Keyword(s):  
Service Life ◽  
Railway Bridge ◽  
Vibration Mitigation ◽  
Damping Systems

scholarly journals Service Life Prediction of Reinforced Concrete in a Sea-Crossing Railway Bridge in Jiaozhou Bay: A Case Study

2019 ◽  
Vol 9 (17) ◽  
pp. 3570 ◽  
Author(s):  
Zhe Li ◽  
Zuquan Jin ◽  
Tiejun Zhao ◽  
Penggang Wang ◽  
Lixiao Zhao ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Service Life ◽  
Reliability Index ◽  
Life Prediction ◽  
Jiaozhou Bay ◽  
Chloride Diffusion ◽  
Chloride Diffusion Coefficient ◽  
Railway Bridge ◽  
Box Girder ◽  
The Mean

Reinforced bar corrosion induced by chloride ingression is one of the most significant threats to the durability of concrete structures in marine environments. The concrete cover thickness, compressive strength, chloride diffusion coefficient, and surface defects of reinforced concrete in the Jiaozhou Bay sea-crossing railway bridge were measured. The temperature and relative humidity in the concrete and the loading applied onto the reinforced concrete were monitored. Based on the DuraCrete model, a revised model for the service life prediction of concrete structures was established, considering the effects of temperature and loading on the chloride diffusion coefficient. Further, the reliability indexes of the reinforced concrete box girder, pier, and platform, located in the marine and land sections, in relation to service lives lasting various numbers of years, were calculated. The measured and calculated results show that the mean cover thicknesses of concrete piers in the marine and land sections are 52 mm and 36 mm, respectively, and the corresponding standard deviations are 5.21 mm and 3.18 mm, respectively. The mean compressive strengths of concrete in the marine and land sections are 56 MPa and 46 MPa, respectively. The corresponding standard deviations are 2.45 MPa and 2.67 MPa, respectively. The reliability indexes of the reinforced concrete box girder and platform in the marine section, under the condition of a service life of 100 years, are 1.81 and 1.76, respectively. When the corrosion-resistant reinforced bar was used in the pier structure in the marine section, its reliability index increased to 2.01. Furthermore, the reliability index of the reinforced concrete damaged by salt fog in the land section was 1.71.

On the Assessment of Fatigue Damage in Railway Bridges

2013 ◽  
Vol 569-570 ◽  
pp. 406-413
Author(s):  
Dermot W. O'Dwyer
Keyword(s):  
Service Life ◽  
Monitoring Systems ◽  
Assessment Methodology ◽  
Railway Bridge ◽  
Loading History ◽  
Single Track ◽  
Fatigue Assessment ◽  
Railway Bridges ◽  
Strain Measurements ◽  
Level Of Knowledge

This paper discusses the benefits to using direct strain measurements when undertaking a fatigue assessment of a railway bridge. The paper gives a brief overview of the assessment methodology for assessing fatigue in a bridge carrying a single track before outlining a method suitable for assessing multi-track bridges. The accuracy of a fatigue assessment depends on the level of knowledge of many different parameters including: an accurate loading history comprising axle loads and train frequencies over its service life; details of changes to the track form, including changes in the depth of ballast; and changes to the structure including damage or repairs. Many of these parameters are not known with certainty. However, using monitoring systems to measure the strain cycles in a bridge helps to address some of these uncertainties and hence improves the accuracy of the assessment.

scholarly journals Safety Evaluation of the Wear Life of High-Speed Railway Bridge Bearings by Monitoring Train-Induced Dynamic Displacements

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Gaoxin Wang ◽  
Youliang Ding ◽  
Hui Guo ◽  
Xinxin Zhao
Keyword(s):  
Service Life ◽  
Wear Rate ◽  
Small Amplitude ◽  
Safety Evaluation ◽  
Linear Wear ◽  
Railway Bridge ◽  
Linear Wear Rate ◽  
Wear Life ◽  
Short Period ◽  
Bridge Bearings

Bridge bearings experience numerous small-amplitude displacements under environmental loads. The continuous cyclic accumulations of these small-amplitude displacements will result in severe wear on the poly-tetra-fluoro-ethylene (PTFE) plates in the bridge bearings, which seriously endangers the service life of bearings. Traditional method directly uses the linear wear rate of cumulative displacements in a short period to evaluate the wearing life, but the linear wear rate only in a short period such as several days may not represent the characteristics in the whole bridge service life. Hence, this research takes the spherical steel bearings of the Nanjing Dashengguan Yangtze River Bridge as a study object. The cumulative dynamic displacement (CDD) under the action of a single train and the cumulative bearing travel (CBT) under the continual actions of many trains are studied using the monitored longitudinal displacement data from spherical steel bearings. Furthermore, the probability statistics and the Monte Carlo sampling simulation for CDD are studied, and the safety evaluation method for bearing wear life in the real environment is proposed using a reliability index regarding the failure probability of monitored CBT over the wear limit during service lifetime. In addition, safety evaluation on the bearing wear life was performed to assess the condition of spherical steel bearings in the real service environment. The results can provide an important reference for analysis on the bearing wear life of long-span railway bridge structures.

scholarly journals Extending the Fatigue Service Life of a Railway Bridge by Local Approaches

2013 ◽  
Vol 99 (11) ◽  
pp. 444-445 ◽  
Author(s):  
Andreas Andersson ◽  
John Leander ◽  
Raid Karoumi
Keyword(s):  
Service Life ◽  
Railway Bridge

A Chinese Railway Bridge

1913 ◽  
Vol 75 (1942supp) ◽  
pp. 181-181
Author(s):  
F. C. Coleman
Keyword(s):  
Railway Bridge
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