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2019 Vol.21, Issue 6 Preview Page

Research Paper

Performance evaluation of high-performance lattice girder using numerical analysis

수치해석을 통한 고성능 격자지보재의 성능 평가

Dong-Gyou Kim1*
,
Sungyoull Ahn2
김 동규1*
,
안 성율2
1Research Fellow, Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology
2CEO, SYTEC Co.
1정회원, 한국건설기술연구원 인프라안전연구본부 연구위원
2정회원, (주)에스와이텍 대표이사
* Corresponding Author
30 November 2019. pp. 897-908
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Abstract

The objective of this study is to evaluate the field support performance of high- performance lattice girder (BK-Lattice Girder) by using numerical analysis. Three types (50, 70, 95-type) of existing and high performance lattice girders were applied to the cross section of highway 2, 3, and 4 lane tunnels to compare the supporting performance. The numerical analysis was the finite element method and the lattice girder was modeled in three dimensions with an elasto-plastic frame. The ground was modeled as a spring receiving only compression. The load was applied as a concentrated load on the central ceiling of the tunnel section. The yield strengths of the lattice girders were determined from the numerical results to compare the supporting performance of lattice girder. In case of 50-type, the yield strengths of high-performance lattice girders were increased by 6.7~10.0% compared with those of the existing lattice girders. In the case of 70-type, the high-performance lattice girders increased yield strengths by 12.1~14.9% than the existing lattice girder. In the case of 95-type, the high-performance lattice girders increased yield strengths by 13.3~20.0% than the existing lattice girder. As a result of numerical analysis, it was considered that the high-performance lattice girder supported better than the existing lattice girder when only the lattice girders were constructed.

Keywords
Tunnel
Lattice girder
Yield strength
Performance
Numerical analysis

본 연구의 목적은 수치해석을 수행하여 고성능 격자지보재(BK-Lattice Girder)의 현장 지지성능을 평가하기 위한 것이다. 고속도로 2차로, 3차로와 4차로 터널 단면에 3가지 형태(50, 70, 95 타입)의 기존 및 고성능 격자지보재를 적용하여 지지성능을 비교하였다. 수치해석은 유한요소방법을 사용하였고 격자지보재는 탄소성 프레임으로 3차원으로 모델링하였다. 지반은 압축만을 받는 스프링으로 모델링하였다. 하중은 터널 단면의 중앙 천정부에 집중하중으로 적용하였다. 수치해석 결과로부터 격자지보재의 항복강도를 결정하여 지지성능을 비교하였다. 50타입의 경우, 고성능 격자지보재는 기존 격자지보재보다 항복강도가 6.7~10.0% 증가하였다. 70타입의 경우, 고성능 격자지보재는 기존 격자지보재보다 항복강도가 12.1~14.9% 증가하였다. 95타입의 경우에도, 고성능 격자지보재는 기존 격자지보재보다 항복강도가 13.3~20.0% 증가하였다. 수치해석을 수행한 결과, 격자지보재만 시공된 경우에 고성능 격자지보재는 기존 격자지보재보다 지지성능이 우수한 것으로 판단되었다.

키워드
터널
격자지보재
항복강도
성능
수치해석
References
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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 : 21
  • No :6
  • Pages :897-908
  • Received Date : 2019-10-01
  • Revised Date : 2019-10-29
  • Accepted Date : 2019-11-05
  • DOI :https://doi.org/10.9711/KTAJ.2019.21.6.897
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