1. Dynamic Analysis of Train-Bridge Systems in High-Speed Railway Bridges Considering Soil-Pile Interaction in Soft Soil Environment.
- Author
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Pan Zeng, Ronghui Wang, and Lixiong Gu
- Subjects
ENVIRONMENTAL soil science ,BOX girder bridges ,RAILROADS ,FREQUENCIES of oscillating systems ,SYSTEM analysis - Abstract
Over the past decade, the development of high-speed railways in China has gained worldwide attention. With the speeding up of the running train, the coupling vibration of the train-bridge system is aggravated, especially for railways built in a soft soil environment. In this paper, the dynamic features of the train-bridge system when considering and failing to consider pilesoil interaction are investigated, i.e., the "train-bridge-pier-pile-soil" (TBPPS) and "train-bridge-pier" (TBP) models. The study is based on a practical high-speed railway project in Hainan Province, where a 32 m span simply-supported box girder bridge with a four-shaft locomotive using two-system suspension model is studied. Results indicate that the natural frequency of the bridge is obviously reduced when the pile-soil interaction is considered, and the vertical vibration frequency of the bridge girder is increased from 4.87 Hz to 5.46 Hz. Moreover, the resonance speed is 500 km/h both for TBP and TBPPS. The results of bridge dynamic load factors, wheel load reduction rates, and train vibration acceleration are significantly different for TBP and TBPPS, and it is not safe if the pile-soil interaction is not considered. Therefore, it is recommended that the pile-soil interaction is extremely important for the train-bridge system when evaluating the safety and smoothness of train running. If the pile-soil interaction is not involved, the derivation will be significantly large. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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