All Issue

2013 Vol.12, Issue 4 Preview Page
The Evaluation for Pullout Performance of Steel Strip Reinforcements with Deformed-Bars as Transverse Members

지지부재로 이형철근을 설치하는 띠형 강보강재의 인발성능 평가

Sung-gyu Jung1
,
Juhyong Kim2
,
Samdeok Cho3
,
Kwangwu Lee4*
정 성규1
,
김 주형2
,
조 삼덕3
,
이 광우4*
1Master Candidate, School of Geo-Space Engineering, Univ. of Science & Technology
2Research Fellow, Geotechnical Engineering Division, Korea Institute of Construction Technology
3Senior Research Fellow, Geotechnical Engineering Division, Korea Institute of Construction Technology
4Senior Researcher, Geotechnical Engineering Division, Korea Institute of Construction Technology
*교신저자. *Corresponding Author. 
30 December 2013. pp. 77-86
PDF XML Citation
Abstract

Laboratory pullout tests were conducted to evaluate pullout performance of steel strip reinforcements with deformed steel bars as transverse members. The steel strip reinforcement has an installation hole to assemble a deformed steel bar. Jumunjin standard sand is used to form a relative density of ground model to 80%. Frictional resistance of steel strip reinforcement without transverse member increases sharply at the initial displacement and quickly decreases with displacement. Maximum frictional resistance increases linearly as normal pressure increasing, and soil-reinforcement interaction friction angle() of a steel strip reinforcement is estimated to 14.64°. Passive resistance increases with displacement and converge into maximum passive resistance in most cases. Maximum passive resistance increases linearly as normal pressure increasing irrespective of shape of the steel reinforcement. Pullout force of steel strip reinforcements with installation holes or transverse members largely increases about 4 to 7 times compared to frictional resistance force of steel strip reinforcements when embedment length() of steel strip reinforcements is 500 mm. In the case of using 2 transverse members, interference effect is observed due to the spacing of 2 transverse members and location of assembly holes and transverse members.

Keywords
Steel strip reinforcement
Transverse member
Deformed steel bar
Pullout test
Passive resistance

본 연구에서는 지지부재가 설치된 띠형 강보강재에 대한 실내인발시험을 수행하였다. 주문진 표준사를 사용하여 상대밀도 80%인 모형지반을 조성하였고, 지지부재의 개수를 0∼2개로 구분하여 실내인발시험을 수행하였다. 상재압은 50kN/m2∼200 kN/m2까지 4단계로 구분하여 적용하였고, 1mm/min 속도로 강보강재를 인발하였다. 표면이 매끄러운 띠형 강보강재의 인발저항력은 보강재 표면과 지반 사이에서 마찰저항만 발현되기 때문에 인발 초기에 급격히 증가하다가 지속적으로 감소하는 경향을 나타낸다. 반면, 지지부재를 설치한 강보강재의 인발저항력은 마찰저항뿐만 아니라 수동저항도 함께 발현되므로 계속적으로 증가하는 것으로 나타났다. 보강재의 형태에 관계없이 최대인발저항은 상재압이 증가함에 따라 선형적으로 증가하는 것으로 나타났다. 지지부재를 1개 설치한 경우에 비해 지지부재를 2개 설치했을 때의 최대수동저항은 작게 나타났다. 이는 지지부재의 설치 간격 및 위치에 따라 지지부재에서 발현되는 수동저항의 크기가 다르기 때문에 나타나는 현상으로 판단되며, 지지부재 설치 위치 및 간격에 따른 추가 인발시험을 통해 확인할 필요가 있다.

References
1
1.Alfaro, M. C. (1996), Reinforced soil wall – embankment system on soft foundation using inextensible and extensible grid reinforcements, Ph.D Thesis, Saga University, pp.1–86.
2
2.ASTM D 6706-01 (2007), Standard test method for measuring geosynthetic pullout resistance in soil, ASTM International, United States.
3
3.Berg, R. R., Christopher, B. R. and Samtani, N. C. (2009), Design and construction of mechanically stabilized earth walls and reinforced soil slopes – VolumeⅠ, Publication No. FHWA-NHI-10-024, Federal Highway Administration, Washington, D.C., USA, pp.1-1 – 3-50.
4
4.Han, J. G., Yoon, W. I., Hong, K. K., Hong, W. P., Lee, K. W., Cho, S. D. (2010), “Evaluation on bearing resistance of transverse members in steel strip reinforcement using pullout tests and theoretical equations,” Journal of Korean Geosynthetics Society, Vol.9, No.2, pp.33-40 (In Korean).
5
5.Jung, S. G., Lee, K. W., Kim, J. H., Cho, S. D. (2013), “Laboratory pullout tests of steel strip reinforcements with transverse members,” Proc. of the Korean Geotechnical Society Conference, pp.1129-1134 (In Korean).
6
6.Kim, H. T., Bang, Y. K., Park, S. S., Kim, H. J. (2003), “An experimental study on pullout behavior characteristics of the steel strip reinforcement bolted with braced angles,” Journal of Korean Geotechnical Environmental Society, Vol.4, No.1, pp.67-75 (In Korean).
7
7.Lee, K. W., Cho, S. D., Han, J. G., Hong, K. K. (2009), “Pullout resistance of steel strip reinforcement with transverse members using large-scale pullout tests,” Journal of Korean Geosynthetics Society, Vol.8, No.4, pp.1-8 (In Korean).
8
9.Sankey, J. and Soliman, A. (2004), ‘Tall Wall Mechanically Stabilized Earth Applications,’ Proc. of the Conference on Geotechnical Engineering for Transportation Projects, ASCE, pp.2149-2158.
9
10.Horpibulsuk, S. and Niramitkornburee, A. (2010), “Pullout Resistance of bearing reinforcement embedded in sand, Soils and Foundations,” Japanese Geotechnical Society, Vol.50, No.2, pp.215-226.
Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 12
  • No :4
  • Pages :77-86
  • Received Date : 2013-11-28
  • Revised Date : 2013-12-19
  • Accepted Date : 2013-12-20
  • DOI :https://doi.org/10.12814/jkgss.2013.12.4.077
Journal Informaiton Journal of the Korean Geosynthetics Society Journal of the Korean Geosynthetics Society
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close