Computers and Concrete

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Web-shear capacity of prestressed hollow-core slab unit with consideration on the minimum shear reinforcement requirement

  • Lee, Deuck Hang (Department of Architectural Engineering, University of Seoul) ;
  • Park, Min-Kook (Department of Architectural Engineering, University of Seoul) ;
  • Oh, Jae-Yuel (Department of Architectural Engineering, University of Seoul) ;
  • Kim, Kang Su (Department of Architectural Engineering, University of Seoul) ;
  • Im, Ju-Hyeuk (Department of Architectural Engineering, University of Seoul) ;
  • Seo, Soo-Yeon (Department of Architectural Engineering, Korea National University of Transportation)
  • Received : 2013.07.01
  • Accepted : 2014.07.06
  • Published : 2014.09.30
⟨ Previous Next ⟩

Abstract

Prestressed hollow-core slabs (HCS) are widely used for modern lightweight precast floor structures because they are cost-efficient by reducing materials, and have excellent flexural strength and stiffness by using prestressing tendons, compared to reinforced concrete (RC) floor system. According to the recently revised ACI318-08, the web-shear capacity of HCS members exceeding 315 mm in depth without the minimum shear reinforcement should be reduced by half. It is, however, difficult to provide shear reinforcement in HCS members produced by the extrusion method due to their unique concrete casting methods, and thus, their shear design is significantly affected by the minimum shear reinforcement provision in ACI318-08. In this study, a large number of shear test data on HCS members has been collected and analyzed to examine their web-shear capacity with consideration on the minimum shear reinforcement requirement in ACI318-08. The analysis results indicates that the minimum shear reinforcement requirement for deep HCS members are too severe, and that the web-shear strength equation in ACI318-08 does not provide good estimation of shear strengths for HCS members. Thus, in this paper, a rational web-shear strength equation for HCS members was derived in a simple manner, which provides a consistent margin of safety on shear strength for the HCS members up to 500 mm deep. More shear test data would be required to apply the proposed shear strength equation for the HCS members over 500 mm in depth though.

Keywords

Acknowledgement

Grant : Developments of enhancement techniques on shear strength of hollow-core slab and its composite action with topping concrete

Supported by : National Research Foundation of Korea (NRF)

References

  1. ACI Committee 318 (2005), Building code requirements for structural concrete (ACI 318-05) and commentary, American Concrete Committee, Farmington Hills, MI.
  2. ACI Committee 318 (2008), Building code requirements for structural concrete (ACI 318-08) and commentary, American Concrete Committee, Farmington Hills, MI.
  3. AASHTO LRFD (2007), AASHTO LRFD Bridge Design Specifications, 4th edition, American Association of State Highway and Transportation Officials, Washington, D.C.
  4. Becker, R.J. and Buettner, D.R. (1985), "Shear tests of extruded hollow core slabs", PCI J., 30(2), 40-54. https://doi.org/10.15554/pcij.03011985.40.54
  5. Bertagnoli, G. and Mancini, G. (2009), "Failure analysis of hollow-core slabs tested in shear", Struct. Concrete, 10(3), 139-152. https://doi.org/10.1680/stco.2009.10.3.139
  6. British Standard Institute (1972), Code of practice for the structural use of concrete, Part 1, CP110, London.
  7. British Standard Institute (1997), Structural Use of Concrete - Part 1 Code of Practice for Design and Construction, BS 8110-1:1997, London.
  8. Buettner, D.R. and Becker, R.J. (1998), PCI Manual for the Design of Hollow-Core Slabs, 2nd edition, Precast/Prestressed Concrete Institute, Chicago, ILLINOIS.
  9. Collins, M.P. and Mitchell, D. (1991), Prestressed Concrete Structures, Prentice Hall, NJ.
  10. European Committee for Standardization (CEN) (2004), Eurocode 2: Design of Concrete Structure. Part 1-1: General Rules and Rules for Buildings, EN 1992-1-1:2004, Brussels.
  11. FIP Recommendations (1988), Precast prestressed hollow core floors, FIP Commission on Prefabrication, London.
  12. Hawkins, N.M. and Ghosh, S.K. (2006), "Shear strength of hollow-core slabs", PCI J., 51(1), 110-115. https://doi.org/10.15554/pcij.09012006.110.130
  13. Im, J.H., Park, M.K., Lee, D.H., Kim, K.S., Seo, S.Y. and Jang, S.Y. (2012), "Effect of effective prestress on shear capacity of hollow-core slab units", Adv. Sci. Lett., Accepted for Publication.
  14. Concrete Committee of JSCE (2007), Standard Specifications for Concrete Structures - Design, Japan Society of Civil Engineers, Tokyo.
  15. Kani, G N.J. (1964), "The riddle of shear failure and its solution", ACI Struct. J., 61(4), 441-467.
  16. Kim, K.S. and Lee, D.H. (2012a), "Flexural behavior model for post-tensioned concrete members with unbonded tendons", Compt. Concrete, 10(3), 241-258. https://doi.org/10.12989/cac.2012.10.3.241
  17. Kim, K.S. and Lee, D.H. (2012b), "Nonlinear analysis method for continuous post-tensioned concrete Members with Unbonded Tendons", Eng. Struct., 40(1), 487-500. https://doi.org/10.1016/j.engstruct.2012.03.021
  18. Kuchma, D., Hawkins, N.M., Kim, S., Sun, S. and Kim, K.S. (2008), "Simplified shear provisions of the AASHTO LRFD bridge design specifications", PCI J., 38(3), 53-73.
  19. Lee, D.H. and Kim, K.S. (2011), "Flexural strength of prestressed concrete members with unbonded tendons", Struct. Eng. Mech., 38(5), 675-696. https://doi.org/10.12989/sem.2011.38.5.675
  20. Lee, J.Y., Lee, D.H., Hwang, J.H., Park, M.K., Kim, K.S. and Kim, H.Y. (2013), "Investigation on allowable compressive stresses in pretensioned concrete members at transfer", KSCE J. Civ. Eng., 17(5), 1083-1098. https://doi.org/10.1007/s12205-013-0309-x
  21. Mac Gregor, J.G. (2005), Reinforced Concrete Mechanics and Design, 4th edition, Prentice Hall, Singapore.
  22. Nawy, E.G. (2006), Prestressed Concrete : a Fundamental approach, 5th edition, Prentice Hall, NJ.
  23. Nilson, A. (1987), Desing of Prestressed Concrete, 2nd edition. John Wiley & Sons, Singapore.
  24. Pajari, M. (2005), Resistance of Prestressed Hollow Core Slabs Against Web Shear Failure, Research Notes 2292, Technical Research Centre of Finland (VTT), Espoo.
  25. Pajari, M. (2009), "Web shear failure in prestressed hollow core slabs", J. Struct. Eng., ASCE, 42(4), 207-217.
  26. Palmer, K.D. and Schultz, A.E. (2010), "Factors affecting web-shear capacity of deep hollow-core units", PCI J., 55(2), 123-146. https://doi.org/10.15554/pcij.03012010.123.146
  27. Palmer, K.D. and Schultz, A.E. (2011), "Experimental investigation of the web-shear strength of deep hollow-core units", PCI J., 56(3), 83-104. https://doi.org/10.15554/pcij.09012011.83.104
  28. Reineck, K.H., Kuchma, D., Kim, K.S. and Marx, S. (2003), "Shear database for reinforced concrete members without shear reinforcement", ACI Struct. J., 100(2), 240-249.
  29. TNO Building and Constructions Research (2005), TNO Report: Standard Shear Tests on Prestressed Hollow Core Slabs according to EN 1168, TNO Building and Constructions Research, Hague.
  30. Ugural, A.C. and Fenster, S.K. (2003), Advanced Strength and Applied Elasticity, Prentice Hall, NJ.
  31. Walraven, J.C. and Mercx, W.P.M. (1983), "The bearing capacity of prestressed hollow-core slabs", Heron, 28(3), 1-46.
  32. Yang, L. (1994), "Design of prestressed hollow-core slabs with reference to web-shear failure", J. Struct. Eng., ASCE, 120(9), 2675-2696. https://doi.org/10.1061/(ASCE)0733-9445(1994)120:9(2675)

Cited by

  1. Estimation of transfer lengths in precast pretensioned concrete members based on a modified thick-walled cylinder model vol.17, pp.1, 2016, https://doi.org/10.1002/suco.201500049
  2. Shear Strength Reduction Factor of Prestressed Hollow-Core Slab Units Based on the Reliability Approach vol.2017, 2017, https://doi.org/10.1155/2017/8280317
  3. A study about determination of preliminary design & minimum reinforcement ratios vol.17, pp.5, 2016, https://doi.org/10.12989/cac.2016.17.5.673
  4. Seismic performances of centrifugally-formed hollow-core precast columns with multi-interlocking spirals vol.20, pp.6, 2016, https://doi.org/10.12989/scs.2016.20.6.1259
  5. Experimental Study on an Optimized-Section Precast Slab with Structural Aesthetics vol.8, pp.8, 2018, https://doi.org/10.3390/app8081234
  6. Web-Shear Capacity of Thick Precast Prestressed Hollow-Core Slab Units Produced by Extrusion Method vol.13, pp.1, 2019, https://doi.org/10.1186/s40069-018-0288-x
  7. Investigation of the behavior of reinforced concrete hollow-core thick slabs vol.19, pp.5, 2017, https://doi.org/10.12989/cac.2017.19.5.567
  8. Unified equivalent frame method for post-tensioned flat plate slab structures vol.20, pp.6, 2014, https://doi.org/10.12989/cac.2017.20.6.663
  9. Shear Performance of Optimized-Section Precast Slab with Tapered Cross Section vol.11, pp.1, 2014, https://doi.org/10.3390/su11010163
  10. Flexural and Shear Performance of Prestressed Composite Slabs with Inverted Multi-Ribs vol.9, pp.22, 2014, https://doi.org/10.3390/app9224946
  11. Behavior of reinforced concrete segmental hollow core slabs under monotonic and repeated loadings vol.6, pp.4, 2014, https://doi.org/10.12989/smm.2019.6.4.269
  12. Shear Tests of Deep Hollow Core Slabs Strengthened by Core-Filling vol.10, pp.5, 2014, https://doi.org/10.3390/app10051709
  13. 슬립폼 방식으로 제작된 역리브 프리캐스트 슬래브의 구조거동에 대한 실험적 연구 vol.24, pp.3, 2020, https://doi.org/10.11112/jksmi.2020.24.3.80
  14. Structural Performance of Shear Loaded Precast EPS-Foam Concrete Half-Shaped Slabs vol.12, pp.22, 2014, https://doi.org/10.3390/su12229679
  15. Behavior of reinforced sustainable concrete hollow-core slabs vol.11, pp.4, 2021, https://doi.org/10.12989/acc.2021.11.4.271
  16. Shear strength model for prestressed concrete beams with steel fibres failed in shear vol.73, pp.14, 2014, https://doi.org/10.1680/jmacr.19.00391
  17. Experimental and Numerical Investigations on Fire-Resistance Performance of Precast Concrete Hollow-Core Slabs vol.11, pp.23, 2014, https://doi.org/10.3390/app112311500