Key Takeaways & Executive Findings
- •• First systematic comparison of train dynamic response across suspension, cable-stayed, and cable-stayed-suspension collaborative system bridges under wind-train-bridge coupling. • Safety and smoothness indicators rank consistently: cable-stayed-suspension collaborative system bridge > cable-stayed bridge > suspension bridge, regardless of wind barrier presence. • A 3.0 m wind barrier has negligible effect on speed thresholds at low wind speeds (≤15 m/s) but increases thresholds at high wind speeds (≥20 m/s). • Provides critical wind speed thresholds and performance ratings essential for the design and operation of ultra-long-span dual-purpose highway-railway bridges.
Abstract
Most studies have analyzed the aerodynamic characteristics and wind-train(vehicle)-bridge coupled vibration response of trains or vehicles on bridges of a certain structural system, while few comparative studies have been carried out on the wind-train-bridge coupled vibration response on bridges of three different structural systems. This paper takes the main span 1120 m dual-purpose highway-railway bridge as the engineering background, and studies the three bridge types of (122+1120+90+92) m suspension bridge, (130+432+1120+432+130) m cable-stayed bridge and (92+210+1120+210+92) m cable-stayed-suspension collaborative system bridge. The trend of the maximum value of the train dynamic response to the wind-train-bridge coupling of the three structural system bridges as well as the speed thresholds are compared and analyzed, and conclusions are drawn: 1) Under the same speed, the maximum value of train safety indexes in three types of bridges increases with the increase of wind speed. 2) Under the same wind speed, the safety and smoothness indicators of trains in three types of bridges without wind barriers rank in the order of cable-stayed-suspension collaborative system bridge>cable-stayed bridge>suspension bridge. 3) At low wind speeds (£15 m/s), a 3.0 m wind barrier has negligible effect on speed thresholds. The safety ranking of structural systems remains unchanged: cable-stayed-suspension collaborative system bridge>cable-stayed bridge>suspension bridge. 4) At high wind speeds (³20 m/s), the 3.0 m wind barrier can increase the train speed threshold for bridges within the same structural system. The safety ranking of the three bridge types (3.0 m 30% wind barrier) remains unchanged: cable-stayed-suspension collaborative system bridge>cable-stayed bridge>suspension bridge. This study represents the first systematic comparative analysis of wind speed critical values and performance ratings across three distinct bridge structural systems.
1. Introduction
Currently, in China, the types of bridges with main spans in the kilometer-scale ultra-long span range include cable-stayed bridges, suspension bridges, and cable-stayed-suspension hybrid bridges [1, 2]. In recent years, numerous scholars have employed wind tunnel tests [3 −6], numerical simulations [7 −9], and field tests [10] to individually investigate the aerodynamic characteristics of trains on a structural system bridge, the wind reduction effects, wind-blocking efficiency, and the impact of wind barrier parameters. However, comparative studies on the running performance of trains on bridges with three different structural systems are indeed relatively scarce. Therefore, it is necessary to conduct comparative research on the running performance of trains on bridges with three different structural systems: suspension bridge, cable-stayed bridge, and cable-stayed-suspension hybrid bridges.
In recent years, many scholars have studied the aerodynamic characteristics of trains or vehicles on dual-use highway-railway bridges by means of wind tunnel tests and numerical simulations, but seldom involved in the wind-train(vehicle) -bridge coupled vibration analysis of dual-use highway-railway bridges [11, 12]. Most of the research on the dynamic response of the coupled wind-train(vehicle)-bridge system of a bridge is simulated and analyzed separately, while the systematic study of the coupled wind-train(vehicle) -bridge system of three different structure systems is rarely compared and analyzed [13, 14].
Wind barriers are an effective means of enhancing the operational safety of high-speed trains in bridge wind environments. Installing wind barriers along one or both sides of the track creates a localized operating environment with relatively low wind speeds, significantly increasing the critical operating speed of high-speed trains. However, current research predominantly f
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HE Xu-hui, MA Qing, ZOU Yun-feng, GUO Dian-yi, GUO Xiang-rong, GAO Su-ping (2025). Dynamic response of train in wind-train-bridge coupling based on bridges with different structural systems. Journal of Central South University. https://doi.org/10.1007/s11771-025-6140-y
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Frequently Asked Questions
What are the three bridge structural systems compared in this study?
The study compares a suspension bridge, a cable-stayed bridge, and a cable-stayed-suspension collaborative system bridge, all with a main span of 1120 m.
How does the presence of a wind barrier affect train speed thresholds?
At low wind speeds (≤15 m/s), a 3.0 m wind barrier has negligible effect on speed thresholds. At high wind speeds (≥20 m/s), it can increase the train speed threshold for bridges within the same structural system.
Which bridge structural system provides the best safety and smoothness for trains?
The cable-stayed-suspension collaborative system bridge ranks highest in safety and smoothness indicators, followed by the cable-stayed bridge, and then the suspension bridge.
What is the engineering significance of this study?
This study provides the first systematic comparative analysis of wind speed critical values and performance ratings across three distinct bridge structural systems, offering valuable insights for the design and operation of ultra-long-span dual-purpose highway-railway bridges.
What is the main span of the bridges studied?
All three bridges have a main span of 1120 m, making them representative of kilometer-scale ultra-long span bridges.
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