Using heterogeneous measurement data to update the corrosion degree in bridge girders

2021 ◽  
Author(s):  
Eline Vereecken ◽  
Wouter Botte ◽  
Robby Caspeele ◽  
Geert Lombaert
Keyword(s):  
Service Life ◽  
Measurement Data ◽  
Accurate Estimate ◽  
Concrete Bridges ◽  
Safety Level ◽  
Additional Information ◽  
Concrete Girders ◽  
Remaining Service Life ◽  
Different Types ◽  
Types Of Information

<p>Existing concrete bridges can show signs of deterioration, e.g. due to corrosion, in which case the question arises whether these bridges still have an acceptable safety level. To obtain additional information about the state of the structure, different types of information can be gathered. However, the measurements performed are often not used directly to update the estimate of the corrosion degree of the bridge and the resulting information from different measurement types is not combined. In this contribution, it is investigated how parameters of the service life models for concrete girders subjected to chloride-induced corrosion can be updated based on heterogeneous measurement data, with the focus on modal measurements and strain measurements. The posterior distributions of these parameters are generated based on Bayesian updating. These updated distributions can be used to get a more accurate estimate of the real deterioration state of the bridge. Based on this, the failure probability of the bridge and its remaining service life can be estimated more accurately.</p>

scholarly journals Increasing the efficiency of information transmission in communication channels

2020 ◽  
Vol 19 (3) ◽  
pp. 1306
Author(s):  
Bohdan Zhurakovskyi ◽  
Juliy Boiko ◽  
Vladymir Druzhynin ◽  
Irina Zeniv ◽  
Oleksander Eromenko
Keyword(s):  
Data Transmission ◽  
Comparative Evaluation ◽  
Measurement Data ◽  
Communication Channels ◽  
Information Flows ◽  
Compression Algorithms ◽  
Practical Research ◽  
Different Types ◽  
Types Of Information ◽  
Combined Data

<span lang="EN-US">This paper discusses compression methods focused on data transmission over communication channels. The characteristics of different algorithms for different types of incoming data are analyzed. The purpose of this study is to evaluate the speed of operation of each of the compression algorithms for different types of information and different compression parameters, on the basis of the obtained results to make recommendations for the application of compression methods in systems critical to the performance of the algorithm. Based on the results of the analysis, the methods of compression that can be used in communication channels are selected: LZW, LZH, Vitter and matrix. The practical research of the selected methods on different information flows (text, graphics, measurement data, combined data) was carried out, their comparative analysis was performed. Research has highlighted compression methods that give the most optimal results in each case. Comparative evaluation of algorithms for different parameters is made, the possibility of data compression implementation in systems running in real time is analyzed. Based on the results of the study, recommendations are made for the application of particular compression methods in specific conditions.</span>

The Model for Predicting the Remaining Service Life of Reinforced Concrete Bridges in-Service and Applicability

2011 ◽  
Vol 90-93 ◽  
pp. 1162-1167
Author(s):  
Yi Qiang Xiang ◽  
Dong Mei Guo ◽  
Kun Cheng
Keyword(s):  
Reinforced Concrete ◽  
Service Life ◽  
Life Cycle Cost ◽  
Road Traffic ◽  
Concrete Bridges ◽  
Maintenance Cost ◽  
Future Research ◽  
Concrete Bridge ◽  
Remaining Service Life ◽  
Structural Resistance

There is a strong need in maintenance and management of bridge that analyzes and predicts remaining service life (RSL) of reinforced concrete bridge. Since structural resistance of concrete bridge is generally suffered from environment, load and material etc. factors, which are intercoupled and time-varying. Hence researchers should consider the economic development of road traffic area, environment of operational bridge, variation of load, deterioration law of materials, and maintenance cost of LCC for predicting RSL of bridge. This paper reviews recent model of predicting the remaining service life (RSL) for concrete bridge and serviceability, analyzes model characteristic and defects, and looks forward to future research from the viewpoint of structure durability, reliability and life cycle cost, respectively.

scholarly journals Durability of reinforced-concrete track sleepers

2021 ◽  
Author(s):  
Ivan Zovkić
Keyword(s):  
Reinforced Concrete ◽  
Service Life ◽  
Remaining Service Life ◽  
Different Types ◽  
The Republic ◽  
Different Parts

During the regular track inspection of railway lines in various parts of the Republic of Croatia, cracks were found on prestressed reinforced concrete sleepers. These sleepers were installed between 1990 and 2003 in different parts of Croatia, on different surfaces, on railway lines with different intensity and for different types of transport. In order to determine the cause of damage and to estimate the remaining service life of the installed sleepers, the damaged and intact concrete sleepers need to be examined and analyzed. The results have to be compared with the experiences of other railway administrations that have similar problems. Based on the obtained results, it is possible to estimate the service life of concrete sleepers depending on the conditions during operation. It is also possible to estimate how long the damaged sleepers can function as part of the railway.

A Possible Basis for Nondestructive Characterization of Ropes of Nylon 6

1997 ◽  
Vol 503 ◽  
Author(s):  
H. Jiang ◽  
M. K. Davis ◽  
R. K. Eby ◽  
P. Arsenovic
Keyword(s):  
Tensile Strength ◽  
Service Life ◽  
Fiber Diameter ◽  
Structural Parameters ◽  
Crystal Form ◽  
Nylon 6 ◽  
Remaining Service Life ◽  
Nondestructive Characterization ◽  
Fractional Content

ABSTRACTPhysical properties and structural parameters have been measured for ropes of nylon 6 as a function of the number of use operations. The fractional content of the α crystal form, sound velocity, birefringence, tensile strength and length all increase systematically and significantly with increasing the number of use operations. The fractional content of the γ crystal form and fiber diameter decrease with use. These trends indicate that the measurement of such properties and structural parameters, especially the length, provide a possible basis for establishing a reliable, rapid, and convenient nondestructive characterization method to predict the remaining service life of nylon 6 ropes.

Effect of sleep on memory for binding different types of visual information

2020 ◽  
Author(s):  
John J Shaw ◽  
Zhisen Urgolites ◽  
Padraic Monaghan
Keyword(s):  
Visual Information ◽  
Storage Capacity ◽  
Declarative Memory ◽  
Recognition Task ◽  
Forced Choice ◽  
Long Term Memory ◽  
Term Memory ◽  
Different Types ◽  
Types Of Information

Visual long-term memory has a large and detailed storage capacity for individual scenes, objects, and actions. However, memory for combinations of actions and scenes is poorer, suggesting difficulty in binding this information together. Sleep can enhance declarative memory of information, but whether sleep can also boost memory for binding information and whether the effect is general across different types of information is not yet known. Experiments 1 to 3 tested effects of sleep on binding actions and scenes, and Experiments 4 and 5 tested binding of objects and scenes. Participants viewed composites and were tested 12-hours later after a delay consisting of sleep (9pm-9am) or wake (9am-9pm), on an alternative forced choice recognition task. For action-scene composites, memory was relatively poor with no significant effect of sleep. For object-scene composites sleep did improve memory. Sleep can promote binding in memory, depending on the type of information to be combined.

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