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2016 Vol.18, Issue 2 Preview Page
Performance evaluation of lattice girder depending on the quality of steel

강재 품질에 따른 격자지보재의 성능평가

Hyuk-Sang Jung1
,
Young-Wan Shin2
,
Ki-Il Song3*
,
Jong-Ho Shin4
정 혁상1
,
신 영완2
,
송 기일3*
,
신 종호4
1Assistant Professor, Department of Railroad Civil Engineering, Dongyang University
2CEO, Hakyung Engineering CO., Ltd.
3Associate Professor, Department of Civil Engineering, Inha University
4Professor, Department of Civil Engineering, Konkuk University
1동양대학교
2㈜하경엔지니어링
3인하대학교
4건국대학교
*교신저자. *Corresponding Author. 
31 March 2016. pp. 165-173
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Abstract

This paper dealt with contents on the performance evaluation of standardized steel and non-standardized steel of lattice girder. Lattice girder is arch type tunnel supports made of structural steel bar and it is girder used to ensure the stability of tunnel by suppressing any transformation of ground as much as possible during tunnel excavation. The performance evaluation of lattice girder can be conducted through bending strength test, tensile strength test and tunnel standard specification specifies that welding structural steel with over 500MPa yield strength shall be used. However, it is difficult to distinguish visually between standardized steel and non-standardized steel onsite if low-quality structural steel is used. Accordingly, this paper conducted performance evaluation of standardized steel and non-standardized steel of lattice girder to point out the issue of deteriorated yield strength of non-standardized steel, while proposed a method of verifying yield strength onsite.

Keywords
Lattice girder
Non-standardized lattice girder
Yield strength
Performance evaluation

본 논문은 격자지보재의 규격자재와 비규격자재의 성능평가에 대한 내용을 다루었다. 격자보재는 강봉으로 제작된 아치형의 터널지보공을 말하며 터널 굴착시 지반의 변형을 최대로 억제하여 터널의 안정성을 확보하기 위하여 사용되어지는 지보재이다. 이런 격자지보재의 성능평가는 휨강도시험과 인장강도시험을 통해 평가할 수 있으며 터널표준시방서에서는 항복강도 500MPa 이상인 용접용 강재를 사용도록 규정하고 있다. 그러나 저품질의 강재가 사용될 경우 현장에서 규격자재와 비규격자재를 육안으로 구분하기 어렵게 되었다. 따라서 본 논문에서는 격자지보재의 규격자재와 비규격자재에 대한 성능평가를 실시하여 비규격자재의 항복강도 저하의 문제점을 분석하였다.

키워드
격자지보재
비규격 격자지보재
항복강도
성능평가
References
1
1.Kim, D.K., Bae, G.J. (2008), “Develope of a labora-tory testing method for evaluating the loading capability of lattice girser”, Korean Tunnelling and Underground Space Technology, Vol. 10, No. 4, pp. 1-12.
2
2.Kim, D.K., Bae, G.J. (2011), “BK-Lattice girder”, Korean Tunnelling and Underground Space Tech-nology, pp. 435-440.
3
3.Kim, D.K., Lee, S.H., Choi, Y.N. (2008), “Evaluation of loading capacity of lattice girder according to laboratory testing method”, 2008 Proceedings of Korean Geo-Environmental Society, Korean Geo- Environmental Society, pp. 399-460.
4
4.Kim, D.K., Lee, S.H., Kim, N.Y. (2009), “Status and capacity of lattice girder”, 2009 Proceedings of Korean Geo-Environmental Society, pp. 371-380.
5
5.Ministry of Land, Infrastructure and Transport (2015), “Guidelines for the design of tunnel”, pp. 48-50.
6
6.Ministry of Land, Infrastructure and Transport (2015), “Tunnel construction guide specification”, pp. 35-39.
7
7.Moon, H.D. (1999), “Evaluation on the applicability of a lattice girder for a support system in tunnelling”, Korean Society for Rock Mechanics, pp. 204-213.
Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 18
  • No :2
  • Pages :165-173
  • Received Date : 2016-02-12
  • Revised Date : 2016-02-26
  • Accepted Date : 2016-03-02
  • DOI :https://doi.org/10.9711/KTAJ.2016.18.2.165
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