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2013 Vol.29, Issue 4 Preview Page
Resistance Factor Calculation of Driven Piles of Long Span Bridges

장대교량 타입말뚝에 대한 저항계수 산정

Dong-Wook Kim1*
,
Jae-Hyun Park2
,
Joon-Yong Lee3
,
Ki-Seok Kwak4
김 동욱1*
,
박 재현2
,
이 준용3
,
곽 기석4
1Senior researcher, Geotech. Research Eng. Div., KICT
2Senior researcher, Geotech. Research Eng. Div., KICT
3Post-doctoral researcher, Geotech. Research Eng. Div., KICT
4Research Fellow, Geotech. Research Eng. Div., KICT
1한국건설기술연구원 지반연구실 수석연구원
2한국건설기술연구원 지반연구실 수석연구원
3한국건설기술연구원 지반연구실 박사후 연구원
4한국건설기술연구원 지반연구실 연구위원
*교신저자. *Corresponding Author. 
30 April 2013. pp. 57-65
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Abstract

Assessment of uncertainties of loads and resistances is prerequisite for the development of load and resistance factor design (LRFD). Many previous studies related to resistance factor calculations of piles were conducted for short or medium span bridges (span lengths less than 200m) reflecting the live load uncertainty for ordinary span bridges. In this study, by using a revised live load model and its uncertainty for long span bridges (span lengths longer than 200m and shorter than 1500m), resistance factors are recalibrated. For the estimation of nominal pile capacity (both base and shaft capacities), the Imperial College Pile (ICP) design method is used. For clayey and sandy foundation, uncertainty of resistance is assessed based on the ICP database. As long span bridges are typically considered as more important structures than short or medium span bridges, higher target reliability indices are assigned in the reliability analysis. Finally, resistance factors are calculated and proposed for the use of LRFD of driven piles for ordinary span and long span bridges.

Keywords
Long span bridge
Driven pile
Target reliability index
Live load uncertainty
LRFD

하중저항계수설계법(load and resistance factor design, LRFD)을 개발하기 위해서는 하중과 저항에 대한 신뢰성 있는 불확실성 평가가 필요하다. 기존의 말뚝기초 저항계수 산정에 관한 연구는 대부분 일반 교량에 대한 하중의 불확실성을 반영하였다. 본 연구에서는 경간장이 200m이상 300m이하인 교량과 300m이상 1500m이하인 장대 교량에 대하여 수정된 하중모델로부터 평가된 활하중 불확실성을 저항계수 산정에 반영하였다. 타입말뚝 저항을 예측하기 위하여 Imperial College Pile (ICP) 설계법을 사용하였고, 이 설계법을 적용하여 사질토 및 점성토 지반에 대한 타입 말뚝의 저항 불확실성을 평가하였다. 일반 교량에 비하여 장대교량의 경우 파괴시 발생되는 경제적, 인명적 손실이 크기 때문에 기존에 적용한 일반적인 목표신뢰수준을 더 높게 설정하였다. 장대교량에 해당하는 수정된 하중 및 목표신뢰수준에 대하여 산정된 저항계수와 기존에 일반 교량 기초에 대하여 제시된 저항계수를 비교 분석하였다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 29
  • No :4
  • Pages :57-65
  • Received Date : 2013-04-01
  • Accepted Date : 2013-04-09
  • DOI :https://doi.org/10.7843/kgs.2013.29.4.57
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