Fracture influence of longitudinal-continuous base layer on force characteristics of CRTSⅡ slab ballastless track on bridge

CHEN Xiao-ping; WANG Fang-fang; ZHAO Cai-you

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CHEN Xiao-ping, WANG Fang-fang, ZHAO Cai-you. Fracture influence of longitudinal-continuous base layer on force characteristics of CRTSⅡ slab ballastless track on bridge[J]. Journal of Traffic and Transportation Engineering, 2014, 14(4): 25-35.

Citation:

CHEN Xiao-ping, WANG Fang-fang, ZHAO Cai-you. Fracture influence of longitudinal-continuous base layer on force characteristics of CRTSⅡ slab ballastless track on bridge[J]. Journal of Traffic and Transportation Engineering, 2014, 14(4): 25-35.

Citation:

CHEN Xiao-ping, WANG Fang-fang, ZHAO Cai-you. Fracture influence of longitudinal-continuous base layer on force characteristics of CRTSⅡ slab ballastless track on bridge[J]. Journal of Traffic and Transportation Engineering, 2014, 14(4): 25-35.

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Fracture influence of longitudinal-continuous base layer on force characteristics of CRTSⅡ slab ballastless track on bridge

1.
School of Urban and Rural Construction, Chengdu University, Chengdu 610106, Sichuan, China
2.
Key Laboratory of High-speed Railway Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

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Author Bio:
CHEN Xiao-ping(1978-), male, associate professor, PhD, +86-28-84616652, cxp193@163.com
Received Date: 2014-02-18
Publish Date: 2014-08-25

Abstract

Abstract

The mechanics model of longitudinal interaction between CRTSⅡ slab ballastless track and bridge was established considering the fracture of longitudinal-continuous base layer(LCBL), and was solved by finite element method.Key calculation parameters of ballastless track were determined.A bridge with long-span continuous beam was taken as an example, the longitudinal forces and displacements of rail, slab, mortar and bridge support were analyzed when LCBLs with the temperature reductions of 10, 20, 30, 40, 50 ℃ were fractured at 7 typical positions on long-span continuous beam.Analysis result indicates that when the temperature reduction of LCBL is 30 ℃, and LCBL is fractured on long-span continuous beam, the maximal additional longitudinal forces of rail and slab are 155.75 kN and 233.21 kN respectively.The influence of LCBL fracture on the additional longitudinal forces of rail and slab are significant.When the temperature reduction of LCBL does not exceed 10 ℃, no matter LCBL is fractured at any position on long-span continuous beam, the longitudinal relative displacement between slab and LCBL is less than 0.5 mm, and mortar can't crack.When the temperature reduction of LCBL is 50 ℃, the maximal additional longitudinal force of fixed support caused by LCBL fracture at any position on long-span continuous beam is 196.12 kN, bridge fixed support can't be destroyed directly by LCBL fracture.When the maintenance operation of LCBL is carried out, it is recommended that the temperature difference between sawing and laid LCBL can't exceed 10 ℃, and rail strength must be checked out to meet the requirements.
- railway engineering,
- bridge,
- CRTS Ⅱ slab ballastless track,
- longitudinal-continuous base layer,
- mechanics model,
- additional longitudinal force,
- fracture

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References(16)

References

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