Identification of dynamic properties of a flooded ballast layer using impact excitation technique and minimization algorithm

In recent times, the railway sector has faced a pressing need to expand its railway network, resulting in the widespread adoption of ballasted tracks. These tracks are favored for their ease of construction, making them a cost-effective solution for the railway industry. However, with global warming...

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Vydané v:Journal of infrastructure preservation and resilience Ročník 5; číslo 1; s. 13 - 20
Hlavní autori: Wangtawesap, Ratabhat, Chintanapakdee, Chatpan, Ngamkhanong, Chayut
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Cham Springer International Publishing 01.12.2024
Springer Nature B.V
SpringerOpen
Predmet:
Algorithms
Ballasted track
Beam theory (structures)
Behavior
Box beams
Civil Engineering
Climate change
Degrees of freedom
Drainage
Dynamic characteristics
Dynamic properties
Elastic foundations
Elastic properties
Engineering
Flooding
Floods
Global warming
Hammering
Impact analysis
Impact test
Modal testing
Optimization
Optimization algorithms
Railroad ballast
Railroad ties
Railway engineering
Railway networks
Railway tracks
Railways
Sleeper
Stiffness
Timoshenko beams
Water levels
Weather
Wood construction
Extreme events
Ballasted track
Dynamic properties
Modal testing
Sleeper
Flooding
Impact test
ISSN:2662-2521, 2662-2521
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Popis
Shrnutí:In recent times, the railway sector has faced a pressing need to expand its railway network, resulting in the widespread adoption of ballasted tracks. These tracks are favored for their ease of construction, making them a cost-effective solution for the railway industry. However, with global warming causing more volatile weather conditions leading to multiple occurrences of flooding in Thai railway structures. Ballast dynamic properties play a crucial role in the analysis of the performance and safety of the railway system. In response to these challenges, this study investigates how flooding affects the dynamic behavior of ballasted track structures. The impact hammering method is frequently used to evaluate the dynamic properties of ballasted tracks. However, previous studies have often simplified the analysis by treating the sleeper-ballast system as a single-degree-of-freedom (SDOF) system. This simplification overlooks the spatial variability in the conditions of the ballast layer. To achieve a more accurate representation, our study employs a multi-degree-of-freedom (MDOF) model, which considers the variability in the stiffness properties of the sleepers. The model for the sleeper-ballast system is constructed based on Timoshenko beam theory resting on an elastic foundation. Simulation of flooding on the ballast layer is conducted using a self-built wooden and acrylic box containing a full-scale track structure. This paper utilizes an instrumented impact hammering method, allowing for a comprehensive assessment of the dynamic properties of the ballast layer. To identify the dynamic characteristics of the ballast, a minimization algorithm is applied. The findings of this research indicate that as the water level rises, the stiffness decreases. This study provides crucial insights into how flooding impacts the dynamic properties of ballasted tracks, offering insights that can be applied to enhance the safety analysis of ballasted tracks in the future.
Bibliografia:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 14
ISSN:2662-2521
2662-2521
DOI:10.1186/s43065-024-00107-x