Evaluation of the performance for the reformed lattice girders

Hak-Joon* Kim; Gyu-Jin Bae; Dong-Gyu Kim

doi:10.9711/KTAJ.2013.15.3.201

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2013 Vol.15, Issue 3 Preview Page Next Page

Evaluation of the performance for the reformed lattice girders 개량형 격자지보재의 성능 평가

31 May 2013. pp. 201-214

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Abstract

Lattice girders are widely used as a substitute for H-steel ribs at domestic tunnels. However, lattice girders have a weak point in terms of the support capacity compare to H-steel ribs because of the lower stiffness and the weakness of the welded parts. To improve the weakness of the lattice girder, reformed lattice girders are developed in Korea by adding one more spider and having flat welded surface. Laboratory tests and field measurements were performed for the original and the reformed lattice girders to evaluate the performance of the reformed lattice girders. According to the laboratory compression test, reformed lattice girders have 16% higher load bearing capacity than that of original lattice girders. Reformed lattice girders are more stable than original lattice girders because reformed lattice girders tend to bend less according to the field measurements.

Keywords

Lattice girder

H-steel ribs

Field measurements

Reformed lattice girder

격자지보재는 기존의 H형강 지보재를 대체하여 현재 국내의 터널현장에서 널리 사용되고 있다. 그러나 격자지보재는 H형강 지보재에 비하여 강성이 떨어지며 이음부를 연결하는 용접에 만전을 기해야 한다는 단점이 있다. 이러한 문제를 개선하기 위하여 연결용 부재가 추가되고 용접부위를 편평하게 만든 개량형 격자지보재가 국내 기술에 의하여 개발되었다. 본 연구에서는 기존 격자지보와 개량형 격자지보에 대한 실내시험 및 현장계측을 수행하여 개량형 격자지보의 성능을 평가하였다. 실내 압축시험결과에 의하면 개량형 격자지보가 기존 격자지보에 비하여 약 16% 정도 큰 지지하중을 보였다. 현장 계측 결과에 의하면 개량형 격자지보가 기존 격자지보보다 강봉의 휨이 적게 발생하여 터널의 안정성 측면에서 더 우수하였다.

키워드

격자지보재

H형강 지보재

현장 계측

개량형 격자지보재

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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 : 15
No :3
Pages :201-214
Received Date : 2013-04-11
Revised Date : 2013-05-02
Accepted Date : 2013-05-12
DOI :https://doi.org/10.9711/KTAJ.2013.15.3.201

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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