Braking Performance and Response Analysis of Trains on Bridges Under Seismic Excitation
Earthquakes can trigger emergency braking in urban rail systems, yet the combined effect of braking and ground motion on train–bridge safety remains poorly quantified. Using the Wuxi Metro Line S1 (160 km/h initial speed) on a ten-span simply supported bridge as a case study, we build a multi-body d...
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| Format: | Article |
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MDPI AG
2025-06-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/15/12/6799 |
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| author | Yuanqing Lu Xiaonan Xie Hongkai Ma Ping Xiang |
| author_facet | Yuanqing Lu Xiaonan Xie Hongkai Ma Ping Xiang |
| author_sort | Yuanqing Lu |
| collection | DOAJ |
| description | Earthquakes can trigger emergency braking in urban rail systems, yet the combined effect of braking and ground motion on train–bridge safety remains poorly quantified. Using the Wuxi Metro Line S1 (160 km/h initial speed) on a ten-span simply supported bridge as a case study, we build a multi-body dynamic subway model coupled to a finite element track–bridge model with non-linear Hertz wheel–rail contact. Under the design-basis earthquake (PGA ≈ 0.10 g), the train’s derailment coefficient and lateral car body acceleration rise by 37% and 45%, while the bridge’s lateral and vertical accelerations increase by 62% and 30%, respectively. Introducing a constant emergency brake deceleration of 1.2 m/s<sup>2</sup> cuts those train-side peaks by 20–25% and lowers the bridge’s lateral acceleration by 18%. The results show that timely braking not only protects passengers but also mitigates seismic demand on the structure, offering quantitative guidance for urban rail emergency protocols in earthquake-prone regions. |
| format | Article |
| id | doaj-art-7357730f61eb47d0ae35fe019fbf2f2b |
| institution | Kabale University |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj-art-7357730f61eb47d0ae35fe019fbf2f2b2025-08-20T03:32:31ZengMDPI AGApplied Sciences2076-34172025-06-011512679910.3390/app15126799Braking Performance and Response Analysis of Trains on Bridges Under Seismic ExcitationYuanqing Lu0Xiaonan Xie1Hongkai Ma2Ping Xiang3Wuxi Metro Group Co., Ltd., Wuxi 214023, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaEarthquakes can trigger emergency braking in urban rail systems, yet the combined effect of braking and ground motion on train–bridge safety remains poorly quantified. Using the Wuxi Metro Line S1 (160 km/h initial speed) on a ten-span simply supported bridge as a case study, we build a multi-body dynamic subway model coupled to a finite element track–bridge model with non-linear Hertz wheel–rail contact. Under the design-basis earthquake (PGA ≈ 0.10 g), the train’s derailment coefficient and lateral car body acceleration rise by 37% and 45%, while the bridge’s lateral and vertical accelerations increase by 62% and 30%, respectively. Introducing a constant emergency brake deceleration of 1.2 m/s<sup>2</sup> cuts those train-side peaks by 20–25% and lowers the bridge’s lateral acceleration by 18%. The results show that timely braking not only protects passengers but also mitigates seismic demand on the structure, offering quantitative guidance for urban rail emergency protocols in earthquake-prone regions.https://www.mdpi.com/2076-3417/15/12/6799subway brakingseismic analysissafety analysis |
| spellingShingle | Yuanqing Lu Xiaonan Xie Hongkai Ma Ping Xiang Braking Performance and Response Analysis of Trains on Bridges Under Seismic Excitation Applied Sciences subway braking seismic analysis safety analysis |
| title | Braking Performance and Response Analysis of Trains on Bridges Under Seismic Excitation |
| title_full | Braking Performance and Response Analysis of Trains on Bridges Under Seismic Excitation |
| title_fullStr | Braking Performance and Response Analysis of Trains on Bridges Under Seismic Excitation |
| title_full_unstemmed | Braking Performance and Response Analysis of Trains on Bridges Under Seismic Excitation |
| title_short | Braking Performance and Response Analysis of Trains on Bridges Under Seismic Excitation |
| title_sort | braking performance and response analysis of trains on bridges under seismic excitation |
| topic | subway braking seismic analysis safety analysis |
| url | https://www.mdpi.com/2076-3417/15/12/6799 |
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