Background Double-deck cable-stayed bridges are needed when traffic demand is high and construction space is limited. They optimize bridge structure use and handle traffic problems by combining highway and railway transportation. The deck slab is a critical component of any bridge model, designed specifically to endure the weight and force of a traffic load. The bridge deck must possess sufficient durability to withstand deformation, cracking, and wear resulting from continuous traffic load. Under dynamic loads, trains induce enhanced stresses and severe deflections in the Double-deck cable-stayed bridges, which raises the risk of bridge damage and disaster. Hence, it is essential to analyze the impact of different factors influencing the dynamic behavior of double-deck cable-stayed bridge systems. The parametric assessments will assess their impact on the bridge system to improve the bridge structure stability via optimizing wheel and rail track design for safety and durability. Research Gap Previous research has highlighted a gap in the dynamic analysis of cable-stayed bridge systems with double decks, indicating that this area has not been extensively explored using non-closed form solution-based analysis (FEM). Objective This study examines the influence of varying factors on the dynamic behavior of double-deck cable-stayed bridges when subjected to a moving train load. Methodology The dynamic analysis caused by the train load of the double-deck cable-stayed bridge was conducted using the finite element method software model. In this finite element model, the SHELL181 element discretizes the bridge superstructure’s deck slab, the CABLE280 element discretizes the cable, and BEAM188 discretizes the bridge substructure’s pier and pylon. The double-deck cable-stayed bridge was analyzed in two stages: free vibration study and dynamic analysis caused by the train load on the lower deck. The meshing and time convergence investigations are carried out to guarantee the precision of the outcomes. The inquiry also examines the variations of these dynamic properties under various load combinations, train speeds, and damping ratios. Outcomes The model’s reliability was validated by doing mesh convergence analysis and comparing the results with those obtained in prior experiments conducted by another researcher. The primary phase involves determining dynamic characteristics, such as equivalent stress and total deformation, by performing dynamic analysis on Double Deck Cable-Stayed Bridges while considering the impact of train loads on the lower deck. The study attempts the dynamic response of a double-deck cable-stayed bridge under train load on the lower deck. This will be achieved by investigating numerous factors, such as varied load combinations, varying train speeds, and different damping ratios of the bridge. Research Limitations/Implications This study’s discoveries offer valuable suggestions for railway and bridge engineers in identifying the most efficient design and maintenance strategy for bridges. The ongoing examination is limited to analyzing the cable-stayed double-deck bridge structure dynamic analysis subjected to train load on the lower deck. This work can serve as a basis for future examination of the double-deck cable-stayed Bridges under dynamic highway vehicles on upper deck, wind, and earthquake loads.

Dynamic Response of Double Deck Cable-Stayed Bridge Subjected to Train Load on Lower Deck

期刊论文
发表日期：

2025年1月6日

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Saket Kumar,
K. Nallasivam

摘要

Background

Double-deck cable-stayed bridges are needed when traffic demand is high and construction space is limited. They optimize bridge structure use and handle traffic problems by combining highway and railway transportation. The deck slab is a critical component of any bridge model, designed specifically to endure the weight and force of a traffic load. The bridge deck must possess sufficient durability to withstand deformation, cracking, and wear resulting from continuous traffic load. Under dynamic loads, trains induce enhanced stresses and severe deflections in the Double-deck cable-stayed bridges, which raises the risk of bridge damage and disaster. Hence, it is essential to analyze the impact of different factors influencing the dynamic behavior of double-deck cable-stayed bridge systems. The parametric assessments will assess their impact on the bridge system to improve the bridge structure stability via optimizing wheel and rail track design for safety and durability.

Research Gap

Previous research has highlighted a gap in the dynamic analysis of cable-stayed bridge systems with double decks, indicating that this area has not been extensively explored using non-closed form solution-based analysis (FEM).

Objective

This study examines the influence of varying factors on the dynamic behavior of double-deck cable-stayed bridges when subjected to a moving train load.

Methodology

The dynamic analysis caused by the train load of the double-deck cable-stayed bridge was conducted using the finite element method software model. In this finite element model, the SHELL181 element discretizes the bridge superstructure’s deck slab, the CABLE280 element discretizes the cable, and BEAM188 discretizes the bridge substructure’s pier and pylon. The double-deck cable-stayed bridge was analyzed in two stages: free vibration study and dynamic analysis caused by the train load on the lower deck. The meshing and time convergence investigations are carried out to guarantee the precision of the outcomes. The inquiry also examines the variations of these dynamic properties under various load combinations, train speeds, and damping ratios.

Outcomes

The model’s reliability was validated by doing mesh convergence analysis and comparing the results with those obtained in prior experiments conducted by another researcher. The primary phase involves determining dynamic characteristics, such as equivalent stress and total deformation, by performing dynamic analysis on Double Deck Cable-Stayed Bridges while considering the impact of train loads on the lower deck. The study attempts the dynamic response of a double-deck cable-stayed bridge under train load on the lower deck. This will be achieved by investigating numerous factors, such as varied load combinations, varying train speeds, and different damping ratios of the bridge.

Research Limitations/Implications

This study’s discoveries offer valuable suggestions for railway and bridge engineers in identifying the most efficient design and maintenance strategy for bridges. The ongoing examination is limited to analyzing the cable-stayed double-deck bridge structure dynamic analysis subjected to train load on the lower deck. This work can serve as a basis for future examination of the double-deck cable-stayed Bridges under dynamic highway vehicles on upper deck, wind, and earthquake loads.