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Title |
PST Member Behavior Analysis Based on Three-Dimensional Finite Element Analysis According to Load Combination and Thickness of Grouting Layer
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Authors |
서현수(Hyun-Su Seo) ; 김진섭(Jin-Sup Kim) ; 권민호(Min-Ho Kwon) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.6.053 |
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Keywords |
콘크리트 구조궤도 ; 열차하중 ; 그라우트충전층 ; PST시스템 ; 3차원 유한요소 해석 Precast concrete slab track ; Train load ; Grouting layer ; PST system ; Three-dimensional finite element analysis |
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Abstract |
Follofwing the accelerating speed-up of trains and rising demand for large-volume transfer capacity, not only in Korea, but also around the world, track structures for trains have been improving consistently. Precast concrete slab track (PST), a concrete structure track, was developed as a system that can fulfil new safety and economic requirements for railroad traffic. The purpose of this study is to provide the information required for the development and design of the system in the future, by analyzing the behavior of each structural member of the PST system. The stress distribution result for different combinations of appropriate loads according to the KRL-2012 train load and KRC code was analyzed by conducting a three-dimensional finite element analysis, while the result for different thicknesses of the grouting layer is also presented. Among the structural members, the largest stress took place on the grouting layer. The stress changed sensitively following the thickness and the combination of loads. When compared with a case of applying only a vertical KRL-2012 load, the stress increased by 3.3 times and 14.1 times on a concrete panel and HSB, respectively, from the starting load and temperature load. When the thickness of the grouting layer increased from 20 mm to 80 mm, the stress generated on the concrete panel decreased by 4%, while the stress increased by 24% on the grouting layer. As for the cracking condition, tension cracking was caused locally on the grouting layer. Such a result indicates that more attention should be paid to the flexure and tension behavior from horizontal loads rather than from vertical loads when developing PST systems. In addition, the safety of each structural member must be ensured by maintaining the thickness of the grouting layer at 40 mm or more.
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