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http://dx.doi.org/10.4334/JKCI.2004.16.5.677

Ultimate Stress of Prestressing Steel in Prestressed Concrete Beams Strengthened by External Prestressing  

Park Sang-Yeol (Dept. of Civil and Environmental Engineering, Cheju National University)
Publication Information
Journal of the Korea Concrete Institute / v.16, no.5, 2004 , pp. 677-686 More about this Journal
Abstract
This study deals with literature review, developing a predicting equation for the ultimate stress of internal and external prestressing steel, and an experimental test with the parameters affecting the ultimate stress of prestressing steel in prestressed concrete beams strengthened by external prestressing tendons. The proposed predicting equation takes rationally the effect of internal and external prestressing steels into consideration as a function of prestressing steel depth to neutral depth ratio. In the experimental study, prestressed concrete beams strengthened using external steel tendons are tested with the test parameters having a large effect on the ultimate stress of internal and external prestressing steel. The test parameters include internal and external prestressing steel reinforcement ratio and span to depth ratio. The test results are analyzed to confirm the rationality and applicability of the proposed equation for predicting the ultimate stress of internal and external prestressing steel. This research shows that the results obtained by the proposed equation for predicting the ultimate stress agreed very well with the test results.
Keywords
external prestressing; ultimate stress; strengthening; unbonded; predicting equation;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 ACI Committee 318, 'Building Code Requirements for Reinforced Concrete (ACI 318-02),' Amencan Concrete Institute, Detroit, Michigan, 2002
2 AASHTO, 'AASHTO LRFD Bridge Design Specification,' 2nd Edition, AASHTO, 2002
3 Du, G. and Tao, X., 'Ultimate Stress in Unbonded Tendons of Partially Prestressed Concrete Beams' PCI Journal, Vol.30, No.6, 1985, pp.72-91   DOI
4 Nonprestressed Reinforcement on the Strength of Unbonded Pardally Prestressed Concrete Members,' ACI Structural Journal, Vol.88, No.5, 1991, pp.546-561
5 Canadian Standards Association Can3-A23.3-M84), 'Design of Concrete Structures for BuiIdings,' Canadian Standards Assodation, 1984
6 Mattock, A. H., Yamazaki, J., and Jattula, B. T.,'Comparative Study of Prestressed Concrete Beamswith and without Bond,' ACI Journal, Vol.68, No.3,1971, pp.116-125
7 임재형, 문정호, 음성우, 이리형, '프리스트레스트 콘크리트 부재에서 비부착 긴장재의 극한응력에 관한 연구(II) -변형도 적합조건을 이용한 설계식의 제안', 콘크리트학회지, 9권 5호, 1997, pp.105-113
8 Naaman, A. E., 'A New Methodology for the Analysis of Beams Prestressed with External or Unbonded Tendons,' ACI SP-120, American Concrete Institute, 1990, pp.339-354
9 한국콘크리트학회, '콘크리트구조설계기준,' 건설교통부, 2003
10 Naaman, A. E. and Alkhairi, F. M., 'Stress at Ultimate in Unbonded Post-Tensioning Tendons Part 2-Proposed Methodology,' ACI StructuralJournal, Vol.88, No.6, 1991, pp.683-692
11 Pannell, F. N., 'The Ultimate Moment of Resistance of Unbonded Prestressed Concrete Beams,' Magazine of Concrete Research, Vol.21, No.66, 1969, pp.43-54   DOI
12 Tom, A. and Pannell, F. N., 'The Ultimate Momentof Resistance of Unbonded Pardally Prestressed Rdnforced Concrete Beams,' Magazine of Concrete Research Vol.28, No.97, 1976, pp.203-208   DOI   ScienceOn
13 박상렬, '외부 프리스트레싱으로 보강된 R.C 보에서강재량 및 텐던깊이에 따른 프리스트레싱 강재의 극한응력', 콘크리트학회논문집, 15권 4호, 2003, pp.585-593
14 오병환, 유성원, '외부 프리스트레스트 콘크리트 부재의 극한상태에서의 강선응력 예측식 제안', 콘크리트학회논문집, 11권 6호, 1999, pp.12-24
15 이종윤, 임재형, 문정호, 신경재, '비부착 긴장재를 갖는 프리스트레스트 콘크리트 보에서 긴장재 응력의과대평가', 콘크리트학회논문집, 11권 4호, 1999, pp.73-81
16 임재형, 문정호, 이리형, '비부착 긴장재의 응력산정을 위한 극한강도 설계식의 평가', 콘크리트학회논문집, 11권 3호, 1999, pp.113-122
17 임재형, 문정호, 이리형, '비부착 긴장재의 응력을 평가하기 위해 제안된 설계식의 타당성 검증', 콘크리트학회논문집, 11권 2호, 1999, pp.127-137
18 임재형, 문정호, 이리형, '비부착 긴장재의 응력에 영향을 미치는 중요변수에 대한 실험연구', 콘크리트학회논문집, 11권 1호, 1999, pp.209-219
19 임재형, 문정호, 음성우, 이리형, '프리스트레스트 콘크리트 부재에서 비부착 긴장재의 극한응력에 관한 연구(I)-기존연구 및 ACI 규준식의 고찰', 콘크리트학회지, 9권 4호, 1997, pp.167-176