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Open AccessArticle

Calculation of Reasonable Tension Value for Longitudinal Connecting Reinforcement of CRTSII Slab Ballastless Track

by Long Chen 1, Jinjie Chen 1 and Jianxi Wang 2,3,*
1
School of Traffic and Transportation, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
2
School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
3
Key Laboratory of Road and Railway Engineering Safety Control (Shijiazhuang Tiedao University), Ministry of Education, Shijiazhuang 050043, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(11), 2139; https://doi.org/10.3390/app8112139
Received: 11 October 2018 / Revised: 22 October 2018 / Accepted: 30 October 2018 / Published: 2 November 2018
There is confusion in the original design concept for the tensioning of longitudinally connected reinforcement of the CRTSII (China Railway Track System) slab ballastless track. In order to clarify the effect of tension value of longitudinal reinforcement on the mechanical characteristics of the ballastless track, a three-dimensional finite element model, considering the nonlinear interaction between the track slab and cement-emulsified asphalt (CA) mortar of the CRTSII slab ballastless track, was established. The mechanical characteristics of the track structure under longitudinal tension load and temperature gradient load of the longitudinal joint were calculated. A method of applying prestress to post-pouring concrete was proposed according to the concept of prestress loss of pretensioning prestressed concrete, a reasonable tensile force value was proposed after the crack width, and the reinforcement stress of the ballastless track in the operation stage was checked and calculated according to the concrete design principle. When the tension force is greater than 300 kN, it is harmful to the bonding between the slab and mortar layer, which is prone to interlayer damage. In order to add prestress to concrete with wide joints to ensure the longitudinal stability of the ballastless track, and that the reinforcement stress and crack width meet design requirements, it is suggested that the tension force value should be 230 kN. Further, the temperature difference between reinforcement and concrete should be 30 °C before the initial curdle of wide joint concrete. View Full-Text
Keywords: tension force; interface damage; CRTSII slab ballastless track; concrete crack; prestress tension force; interface damage; CRTSII slab ballastless track; concrete crack; prestress
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MDPI and ACS Style

Chen, L.; Chen, J.; Wang, J. Calculation of Reasonable Tension Value for Longitudinal Connecting Reinforcement of CRTSII Slab Ballastless Track. Appl. Sci. 2018, 8, 2139.

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