scholarly journals Prediction of Remaining Life for Bridge Decks Considering Deterioration Factors and Propose of Prioritization Process for Bridge Deck Maintenance

2020 ◽  
Vol 12 (24) ◽  
pp. 10625
Author(s):  
Ki Hwan Kim ◽  
Moon S. Nam ◽  
Hoon Hee Hwang ◽  
Ki Yong Ann
Keyword(s):  
Service Life ◽  
Bridge Deck ◽  
Bridge Decks ◽  
Highway Bridges ◽  
Performance Degradation ◽  
Remaining Life ◽  
Remaining Service Life ◽  
Prioritization Process ◽  
Optimizing Design ◽  
Inspection Data

Aged highway bridges have become substantially prevalent in recent years. Moreover, combined deterioration, caused by using deicing agents in winter, has led to increased bridge maintenance costs. Accordingly, to extend the service life of bridge decks, this study utilized actual inspection data and major deterioration factors to derive the remaining service life of bridge decks. Based on this study, the following three factors are selected: deicing agent exposure grade, pavement condition state, and surface improvement status. Performance degradation curves were derived for 11 cases that considered the representative three deterioration factors, and the performance degradation of decks was examined for each deterioration factor. Additionally, a process to determine maintenance priorities, using the current condition of highway bridges and the deterioration factors of individual bridges, was proposed. The maintenance demand was predicted based on the end of deck life, which indicated that the demand for deck replacement will sharply increase in 15 years, and that the decks of more than 2000 bridges will reach the end of life in 40 years. Furthermore, this paper proposes a process for prioritizing the maintenance of approximately 9000 highway bridge decks. By applying the prioritization process for bridge deck maintenance to the bridge deck, not only can the life of the bridge deck be extended, but also environmental pollution can be minimized. Additionally, an optimizing design for bridge decks, by considering the remaining life and deterioration factors, can be possible. Therefore, it is expected that the sustainability of the bridge deck can be accomplished.

scholarly journals Current bridge deck rehabilitation practices : use and effectiveness

2021 ◽  
Author(s):  
Melvin Ramcharitar
Keyword(s):  
North America ◽  
Service Life ◽  
Environmental Impacts ◽  
Old Age ◽  
Bridge Deck ◽  
Bridge Decks ◽  
Winter Season ◽  
Department Of Transportation ◽  
Repair Operation ◽  
Bridge Rehabilitation

Approximately thirty to forty percent of all bridges across North America have some form of deterioration on them. Many organizations/agencies across North America are investing significant amounts of money on repairing and rehabilitating their bridges. The reason being, these bridges are deteriorating due to heavy use (overloading from today's oversized trucks), old age (many built in late 1950s and 1960s) and environmental and chemical attacks (deicing salt applications during the winter season). The purpose of this thesis concentrated on one area, namely bridge decks. To better understand how these organizations/agencies were dealing with bridge deck deterioration, a survey containing thirteen questions was developed and sent out throughout North America, to Department of Transportation, Ministry of Transportation, Municipalities, Bridge Authorities and Consultants. The survey was made up of six parts, each focusing on different areas during a bridge rehabilitation/repair operation. Areas looked at were: Condition Surveys, Concrete Removal, Rehabilitation Techniques, Environmental Impacts and Service Life.

scholarly journals Current bridge deck rehabilitation practices : use and effectiveness

2021 ◽  
Author(s):  
Melvin Ramcharitar
Keyword(s):  
North America ◽  
Service Life ◽  
Environmental Impacts ◽  
Old Age ◽  
Bridge Deck ◽  
Bridge Decks ◽  
Winter Season ◽  
Department Of Transportation ◽  
Repair Operation ◽  
Bridge Rehabilitation

Approximately thirty to forty percent of all bridges across North America have some form of deterioration on them. Many organizations/agencies across North America are investing significant amounts of money on repairing and rehabilitating their bridges. The reason being, these bridges are deteriorating due to heavy use (overloading from today's oversized trucks), old age (many built in late 1950s and 1960s) and environmental and chemical attacks (deicing salt applications during the winter season). The purpose of this thesis concentrated on one area, namely bridge decks. To better understand how these organizations/agencies were dealing with bridge deck deterioration, a survey containing thirteen questions was developed and sent out throughout North America, to Department of Transportation, Ministry of Transportation, Municipalities, Bridge Authorities and Consultants. The survey was made up of six parts, each focusing on different areas during a bridge rehabilitation/repair operation. Areas looked at were: Condition Surveys, Concrete Removal, Rehabilitation Techniques, Environmental Impacts and Service Life.

scholarly journals Conditional survival analysis for concrete bridge decks

2019 ◽  
Vol 9 (1) ◽  
pp. 63-75
Author(s):  
Azam Nabizadeh ◽  
Habib Tabatabai ◽  
Mohammad A. Tabatabai
Keyword(s):  
Service Life ◽  
Bridge Deck ◽  
Bridge Decks ◽  
Conditional Survival ◽  
Probability Of Survival ◽  
Concrete Bridge Decks ◽  
Maintenance Decisions ◽  
National Bridge Inventory ◽  
Specific Number

AbstractBridge decks are a significant factor in the deterioration of bridges, and substantially affect long-term bridge maintenance decisions. In this study, conditional survival (reliability) analysis techniques are applied to bridge decks to evaluate the age at the end of service life using the National Bridge Inventory records. As bridge decks age, the probability of survival and the expected service life would change. The additional knowledge gained from the fact that a bridge deck has already survived a specific number of years alters (increases) the original probability of survival at subsequent years based on the conditional probability theory. The conditional expected service life of a bridge deck can be estimated using the original and conditional survival functions. The effects of average daily traffic and deck surface area are considered in the survival calculations. Using Wisconsin data, relationships are provided to calculate the probability of survival of bridge decks as well as expected service life at various ages. The concept of survival dividend is presented and the age when rapid deterioration begins is defined.

scholarly journals Research on Life Prediction of Fan Spindle Bearing Based on Gated Recurrent Unit Neural Network

2021 ◽  
Vol 261 ◽  
pp. 01039
Author(s):  
Jianeng Ma
Keyword(s):  
Service Life ◽  
Life Prediction ◽  
Learning Algorithm ◽  
Data Sets ◽  
Remaining Life ◽  
Predictive Algorithm ◽  
Remaining Service Life ◽  
Spindle Bearing ◽  
The Relationship ◽  
Gated Recurrent Unit

In order to solve the problems of redundancy calculation and inefficiency of traditional machine learning algorithm in dealing with large amount of historical data of fan, a new predictive algorithm based on gated recurrent unit (GRU) is proposed to predict the remaining service life of fan spindle bearing. Firstly, the vibration history data of the main shaft bearing of the fan is analyzed to find out the relationship between the characteristic value and the remaining life, and the characteristic parameters which can reflect the remaining life are selected; Then, GRU is used to build the remaining service life prediction model of spindle bearing, and the main parameters of the model are adjusted to improve the prediction accuracy of the model. Compared with long short term (LSTM) algorithm, GRU is an effective tool to deal with a large number of data sets.

scholarly journals Performance-Based Reliability Estimates for Highway Bridges Considering Previous Inspection Data

2020 ◽  
Vol 10 (5) ◽  
pp. 1873
Author(s):  
Won-Ho Heo
Keyword(s):  
Highway Bridges ◽  
Performance Degradation ◽  
Current Status ◽  
Degradation Model ◽  
Deterioration Model ◽  
Traffic Characteristics ◽  
The Future ◽  
Rc Slab ◽  
Inspection Data ◽  
Corrosive Environments

This paper proposes a performance-based resistance deterioration model that reflects the site environment and inspection data for highway bridges. Traffic characteristics and corrosive environment are considered as the site environment. The corrosive environments and traffic characteristics are classified into three categories, namely mild, normal, and severe for the former and light, normal, and heavy for the latter. The deterioration of the resistance capacity due to corrosive environments is evaluated considering both the service period and the concrete crack widths in the pre-stressed concrete (PSC) girder and the reinforced concrete (RC) slab. The deterioration model of the resistance capacity is calibrated by combining the performance degradation model. The performance degradation model is also calibrated using previous bridge inspection results from the standard performance degradation model, which has been developed based on the large amount of data available on many pre-stressed concrete-I (PSC-I) type girder bridges. The developed performance-based resistance deterioration model is used to evaluate the reliability of a bridge in the future. The results show that the performance inspection outcomes, either based on the current status or lifetime inspection history, are critical in estimating the future degradation of the reliability level, inherent to the bridge.

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.

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