Analysis of segment lining cracking load considering axial force by varying boundary condition

Gyu-Phil Lee; Gyu-Jin Bae; Soo-Ho Chang; Tae-Sung Kang; Soon-Wook Choi

doi:10.9711/KTAJ.2014.16.2.173

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2014 Vol.16, Issue 2 Preview Page Next Page

Analysis of segment lining cracking load considering axial force by varying boundary condition 경계조건 변화에 의해 발생한 축력을 고려한 세그먼트 라이닝의 균열하중 분석

31 March 2014. pp. 173-180

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Abstract

In the design of tunnel segment structure, axial and moment forces are considered as significant forces. Since axial force is much greater than moment force, the whole section of segment remains in compression. Therefore crack width can be reduced. But the axial force is not considered in criteria for serviceability check. This fact leads service condition more severe compared to ultimate condition and makes the required steel reinforcement increase to meet the serviceability criteria. In this study, the effect of axial force on serviceability of tunnel segment is evaluated, experimentally and analytically. Mock-up tests on segments with actual size were performed and investigated in terms of initial crack resistance. The evaluation proves that more comprehensive design could be achieved when the axial force is considered in the procedure for the serviceability check in design of tunnel segment.

Keywords

Shield tunnel

Segment

Axial force

Cracking load

Cracking moment

세그먼트 설계시, 축력과 휨모멘트가 주로 고려되는 하중이다. 두개의 하중에서 축력이 모멘트 보다 상대적으로 매우 크기 때문에 전단면이 압축상태에 있으며, 이는 균열 폭을 줄이는 효과가 있다. 그러나 콘크리트 구조물의 사용성 검토에서 축력은 고려하지 않고 있기 때문에 설계는 사용성에 지배되고, 사용성을 만족시키기 위하여 소요 철근량을 증가시키게 된다. 본 논문에서는 축력이 세그먼트의 사용성에 미치는 영향을 시험과 단면해석을 통하여 분석하였다. 세그먼트에 대한 시험을 수행하였으며, 초기균열저항성능에 대하여 고찰하였다. 분석결과 사용성 분석에서 축력을 고려함으로서 더욱 합리적인 설계가 가능한 것을 확인할 수 있었다

키워드

쉴드터널

세그먼트

축력

균열하중

균열 모멘트

References

1.Lee, G.P., Bae, G.J., Moon, D.Y., Kang, T.S., Chang. S.H. (2013a), “Evaluation of steel fiber reinforcement effect in segment lining by full scale bending test”, Journal of the Korean Tunnelling Association, Vol. 15, No. 3, pp. 215-223.

2.Lee, G.P., Bae, G.J., Chang. S.H., Choi, S.W., Kang, T.S. (2013b), “Crack control effect by steel fiber reinforcement to segment lining”, Korean Tunnelling Association 2013 Fall Symposium, pp. 97-100.

3.Lee, G.P., Park, Y.T., Choi, S.W., Chang, S.H., Bae, G.J., Kang, T.S., Lee, J.S. (2012), “An experimental sstudy on mechanical behavior of shield segment with High-strength concrete and High-tension rebar”, Journal of the Korean Tunnelling Association, Vol. 14, No. 3, pp. 215-230.

4.Lee, G.P., Heang, J.H., Shin, H.S., Hong, S.G. (2010), “Mechanical behaviour of waterway culvert structure assembled by precast segments”, Journal of the Korean Tunnelling Association, Vol. 12, No. 2, pp. 193-200.

5.Yang, E.I., Kim, J.K., Yi, S.T., Morita Shiro, (1997), “The effect of axial force on the behavior and average crack spacing of reinforced concrete flexural member”, Journal of Korea Concrete Institute, Vol. 9, No. 4, pp. 207-214.

6.Desayi. p., Kulkarni. A.B. (1997), “Load-deflection of restrained R/C slabs”, Journal of the Structural Division, Vol. 103, No. 2, pp. 405-419.

7.Chensheng. O., Wimal. S. (1987), “RC rectangular slabs with edge restraints”, Journal of Structural Engineering, ASCE, Vol. 113, No. 11, pp. 2146- 2165.

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 : 16
No :2
Pages :173-180
Received Date : 2014-02-26
Revised Date : 2014-03-06
Accepted Date : 2014-03-12
DOI :https://doi.org/10.9711/KTAJ.2014.16.2.173

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

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