Expansion-Constriction Force Characteristics of Continuously Rails on Bridge under Fracture Condition of CRTS Ⅱ Track Slab Welded

ZHANG Pengfei; GUI Hao; LEI Xiaoyan

doi:10.3969/j.issn.0258-2724.20180944

Journal of Southwest Jiaotong University > 2020 > 55(5): 1036-1043.

ZHANG Pengfei, GUI Hao, LEI Xiaoyan. Expansion-Constriction Force Characteristics of Continuously Rails on Bridge under Fracture Condition of CRTS Ⅱ Track Slab Welded[J]. Journal of Southwest Jiaotong University, 2020, 55(5): 1036-1043. doi: 10.3969/j.issn.0258-2724.20180944

Citation:

ZHANG Pengfei, GUI Hao, LEI Xiaoyan. Expansion-Constriction Force Characteristics of Continuously Rails on Bridge under Fracture Condition of CRTS Ⅱ Track Slab Welded[J]. Journal of Southwest Jiaotong University, 2020, 55(5): 1036-1043. doi: 10.3969/j.issn.0258-2724.20180944

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Expansion-Constriction Force Characteristics of Continuously Rails on Bridge under Fracture Condition of CRTS Ⅱ Track Slab Welded

doi: 10.3969/j.issn.0258-2724.20180944

Received Date: 03 Nov 2018
Rev Recd Date: 28 Mar 2019

Available Online: 08 May 2020

Publish Date: 01 Oct 2020

Abstract

Abstract

In order to study the longitudinal stress and deformation characteristics and their influences on track and bridge structure under the fracture condition of CRTSⅡ track slab, a spatial coupling model based on the finite element method and bridge-slab-rail interaction mechanism was established. This model can analyze the influences of crack location, width and depth of track slabs, as well as the expansion-constriction stiffness of track slab and bed plate, on distribution rules of the expansion-constriction force of continuously welded rail (CWR) on bridge. Results show that, in order to calculate the expansion-constriction force of CWR on bridge under the fracture condition of CRTSⅡ track slab, a most unfavorable fracture location at track slab should be selected according to the different checking parts. Meanwhile, the crack width and depth of track slab are suggested to be 2 mm and 200 mm, respectively, and the expansion-constriction stiffness of track slab and bed plate should be reduced to 10%−50%, since in this way the calculation result is conservative without losing generality. Track slab fracture increases the fracture risk of cement asphalt mortar screed and bed plate; the longitudinal displacement of rail and the relative displacement between rail and track slab on the side of broken slab are changed dramatically at the crack.
- CRTSⅡ slab track,
- CWR on bridge,
- track slab fracture,
- crack location,
- crack width,
- crack depth

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References(19)

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Expansion-Constriction Force Characteristics of Continuously Rails on Bridge under Fracture Condition of CRTS Ⅱ Track Slab Welded

doi: 10.3969/j.issn.0258-2724.20180944

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Expansion-Constriction Force Characteristics of Continuously Rails on Bridge under Fracture Condition of CRTS Ⅱ Track Slab Welded

doi: 10.3969/j.issn.0258-2724.20180944

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