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2020 Vol.30, Issue 1 Preview Page

Research Article

Development of High Strength Lattice Girder and Evaluation of Its Performance

고강도 격자지보재의 개발 및 그 성능 평가

Jae-Won Lee1
,
Kyong-Nam Min2*
,
Ji-Wook Jeong3
,
Byoung-Kuk Roh4
,
Sang-Jin Lee5
,
Tae-Bong Ahn6
,
Seong-Seung Kang7*
이 재원1
,
민 경남2*
,
정 지욱3
,
노 병국4
,
이 상진5
,
안 태봉6
,
강 성승7*
1Vice President, Sejong E&C Co., Ltd.
2CEO, Sejong E&C Co., Ltd.
3Manager, Sejong E&C Co., Ltd.
4Executive Director, Human Resources Development Institute, Korea Rail Network Authority
5Senior Manage, Human Resources Development Institute, Korea Rail Network Authority
6Professor, Department of Railroad and Civil Engineering, Woosong University
7Professor, Department of Energy and Resources Engineering, Chosun University
1(주)세종이엔씨 부사장
2(주)세종이엔씨 대표이사
3(주)세종이엔씨 과장
4한국철도시설공단 인재개발원 원장
5한국철도시설공단 인재개발원 차장
6우송대학교 철도건설시스템학과 교수
7조선대학교 에너지자원공학과 교수
*Corresponding Author
31 March 2020. pp. 43-57
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Abstract

The objective of this study was to evaluate the performance of high-strength lattice girders as a possible superior alternative to conventional steel arch ribs. For this purpose, the structural characteristics of supports were analyzed using numerical analysis, and their performance was evaluated using maximum bending load tests and tensile tests of the welded joint. According to the results of structural analysis, the optimum size of the upper and lower members and plates is 50 mm × 31.8 mm × 25.4 mm, demonstrating excellent functionality and economic efficiency. High-strength lattice girders of dimensions 55 mm × 30 mm × 20 mm and 85 mm × 30 mm × 20 mm, determined from bending load tests, are found to meet both the reference values and the target values of H-profiles 100 and 125. A review of the ratio of theoretical deflection to actual deflection shows that the high-strength lattice girder developed during this study meets fewer than five of the evaluation criteria for lattice girder deflections proposed by the Federal Railway Department of Germany. Finally, tensile test results reveal that the welded joint of the high-strength lattice girder at the main steel bar-auxiliary steel bar-plate junction exceeds the target value, indicating that the welded joint has sufficient stability.

Keywords
steel arch rib
high strength lattice girder
structural analysis
bending load test
deflection
tensile test

본 연구는 기존의 강지보재보다 우수한 고강도 격자지보재를 개발하여 그 성능을 평가하기 위함이다. 이를 위해 수치해석을 이용한 지보재의 구조적 특성을 분석하였고, 시작품에 대한 최대 굽힘하중시험과 용접이음부 인장강도시험을 실시하여 그 성능을 평가하였다. 구조해석 결과에 따른 최적의 상하부부재와 플레이트의 규격은 50 mm × 31.8 mm × 25.4 mm로 시공성과 경제적이 우수한 것으로 나타났다. 굽힘하중시험으로부터 확정된 규격 55 mm × 30 mm × 20 mm와 85 mm × 30 mm × 20 mm의 고강도 격자 지보재는 기준값과 H형강 100과 125의 목표값 모두 만족하는 것으로 나타났다. 이론 처짐량과 실제 처짐량의 비를 검토한 결과, 이 연구에서 개발된 고강도 격자지보재는 독일연방 철도국에서 제시하고 있는 격자지보재 처짐량의 평가기준 5 이하로 나타났다. 마지막으로 용접이음부에 대한 인장시험 결과는 고강도 격자지보재의 주봉-보조봉-플레이트가 접하는 용접이음부 인장강도가 목표값 이상으로 나타나 용접이음부에 대한 안정성은 충분한 것으로 나타났다.

키워드
강재지보
고강도 격자지보
구조해석
굽힘하중시험
처짐량
인장시험
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 30
  • No :1
  • Pages :43-57
  • Received Date : 2020-02-24
  • Accepted Date : 2020-03-05
  • DOI :https://doi.org/10.9720/kseg.2020.1.043
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