Structural Engineering and Mechanics

  • 제43권4호
  • /
  • Pages.459-473
  • /
  • 2012
  • /
  • 1225-4568(pISSN)
  • /
  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Longitudinal anti-cracking analysis for post-tensioned voided slab bridges

  • Zhou, Zhen (Key Laboratory of RC&PC of Ministry of Education, Southeast University) ;
  • Meng, Shao-Ping (Key Laboratory of RC&PC of Ministry of Education, Southeast University) ;
  • Liu, Zhao (Key Laboratory of RC&PC of Ministry of Education, Southeast University)
  • 투고 : 2010.10.31
  • 심사 : 2012.08.07
  • 발행 : 2012.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

Post-tensioned concrete voided slab girders are widely used in highway bridge constructions. To obtain greater section hollow rate and reduce the self-weight, the plate thickness of slab girders are designed to be small with the adoption of flat anchorage system. Since large prestress is applied to the anchor end section, it was found that longitudinal shear cracks are easy to occur along the voided slab girder. The reason is the existence of great shearing effect at the junction area between web and bottom (top) plate in the anchor end section. This paper focuses on the longitudinal anti-cracking problem at the anchor end of post-tensioned concrete voided slab girders. Two possible models for longitudinal anticracking analysis are proposed. Differential element analysis method is adopted to derive the solving formula of the critical cracking state, and then the practical analysis method for longitudinal anti-cracking is established. The influence of some factors on the longitudinal anti-cracking ability is studied. Results show that the section dimensions (thickness of bottom, web and top plate) and prestress eccentricity on web plate are the main factors that influence the anti-cracking ability. Moreover, the proposed method is applied into three engineering examples to make longitudinal anti-cracking verification for the girders. According to the verification results, the design improvements for these girders are determined.

키워드

참고문헌

  1. Connor, A.O. and Enevoldsen, I.B. (2008), "Probability based modeling and assessment of an existing posttensioned concrete slab bridge", Eng. Struct., 30(5), 1408-1416.
  2. Díaz, J., Hernandez, S., Fontan, A. and Romera, L. (2010), "A computer code for finite element analysis and design of post-tensioned voided slab bridge decks with orthotropic behaviour", Adv. Eng. Soft, 41(7-8), 987-999. https://doi.org/10.1016/j.advengsoft.2010.04.005
  3. Jaeger, L.G., Bakht, B. and Tadros, G. (1998), "Equivalent area of voided slabs", Can. J. Civil. Eng., 25(4), 797-801. https://doi.org/10.1139/l98-002
  4. Jauregui, D.V., Licon-Lozano, A. and Kulkarni, K. (2010), "Higher level evaluation of a reinforced concrete slab bridge", J. Bridge Eng., 15(2), 172-182. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000047
  5. John, H.M. and Kurtis, D.F. (2005), Numerical Methods Using MATLAB, Prentice Hall, Englewood Cliffs, NJ.
  6. Lounis, Z. and Cohn, M.Z. (1995), "Computer-aided design of prestressed concrete cellular bridge decks", Microcomput. Civil Eng., 10(1), 1-11. https://doi.org/10.1111/j.1467-8667.1995.tb00381.x
  7. Mari, A.R. and Montaner, J. (2000), "Continuous precast concrete girder and slab bridge decks", Proceedings of the ICE: Structures and Buildings, 140(3), 195-206.
  8. O'Brien, E.J. and Keogh, D.L. (1998), "Upstand finite element analysis of slab bridges", Comput. Struct., 69(6), 671-683. https://doi.org/10.1016/S0045-7949(98)00148-5
  9. Qaqish, M., Akawwi, E., Fadda, E. and Qaqish, M. (2009), "Comparison between computed shearing forces by AASHTO specifications and finite element method of two continuous spans of voided slab bridge", WSEAS Transactions on Information Science and Applications, 6(4), 621-636.
  10. Scollard, C.R. and Bartlett, F.M. (2004), "Rehabilitation criteria for post-tensioned voided-slab bridges", Can. J. Civil. Eng., 31(6), 977-987. https://doi.org/10.1139/l04-057
  11. Sen, R., Issa, M. and Gergess, A. (1993), "Collapse load analysis of continuous, posttensioned voided slab bridge models", J. Struct. Eng., ASCE, 119(6), 1825-1843. https://doi.org/10.1061/(ASCE)0733-9445(1993)119:6(1825)
  12. Zhao, Z., Jiang, X.D. and Huo, D. (2007), "Single slab load analysis of pre-stressed concrete hollow slab based on destructive test", Journal of Beijing University of Technology, 33(5), 498-502. (in Chinese)

피인용 문헌

  1. Numerical Analysis on Different Void Former On ANSYS vol.796, pp.1, 2012, https://doi.org/10.1088/1755-1315/796/1/012011