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Behavior of continuous RC deep girders that support walls with long end shear spans

  • Lee, Han-Seon (School of Civil, Environmental, and Architectural Engineering, Korea University) ;
  • Ko, Dong-Woo (Department of Architectural Engineering, Jeju National University) ;
  • Sun, Sung-Min (Hyundai Engineering Co. Ltd.)
  • Received : 2010.04.26
  • Accepted : 2010.10.20
  • Published : 2011.05.25

Abstract

Continuous deep girders which transmit the gravity load from the upper wall to the lower columns have frequently long end shear spans between the boundary of the upper wall and the face of the lower column. This paper presents the results of tests and analyses performed on three 1:2.5 scale specimens with long end shear spans, (the ratios of shear-span/total depth: 1.8 < a/h < 2.5): one designed by the conventional approach using the beam theory and two by the strut-and-tie approach. The conclusions are as follows: (1) the yielding strength of the continuous RC deep girders is controlled by the tensile yielding of the bottom longitudinal reinforcements, being much larger than the nominal strength predicted by using the section analysis of the girder section only or using the strut-and-tie model based on elastic-analysis stress distribution. (2) The ultimate strengths are 22% to 26% larger than the yielding strength. This additional strength derives from the strain hardening of yielded reinforcements and the shear resistance due to continuity with the adjacent span. (3) The pattern of shear force flow and failure mode in shear zone varies depending on the amount of vertical shear reinforcement. And (4) it is necessary to take into account the existence of the upper wall in the analysis and design of the deep continuous transfer girders that support the upper wall with a long end shear span.

Keywords

References

  1. ACI (1995), Building Code Requirements for Structural Concrete (ACI 318-95), American Concrete Institute, MI.
  2. ACI (2002), Building Code Requirements for Structural Concrete (ACI 318-02), American Concrete Institute, MI.
  3. ACI (2005), Building Code Requirements for Structural Concrete (ACI 318-05), American Concrete Institute, MI.
  4. Aguilar, G., Matamoros, A.B., Parra-Montesinos, G.J., Ramirez, J.A. and Wight, J.K. (2002), "Experimental evaluation of design procedures for shear strength of deep reinforced concrete beams", ACI Struct. J., 99(4), 539-548.
  5. Cook, W.D. and Mitchell, D. (1988), "Studies of disturbed regions near discontinuities in reinforced concrete members", ACI Struct. J., 85(2), 206-216.
  6. De Witte, F.C. and Kikstra, W.P. (2005), DIANA - Finite Element Analysis, TNO DIANA BV.
  7. Hwang, S.J., Lu, W.Y. and Lee, H.J. (2000), "Shear strength prediction for deep beams", ACI Struct. J., 97(3), 367-376.
  8. Kong, F.K., Robins, P.J. and Short, D.R. (1970), "Deep beams with inclined web reinforcement", ACI J., 69(6), 172-176.
  9. Lu, W.Y., Hwang, S.J. and Lin, I.J. (2010), "Deflection prediction for reinforced concrete deep beams", Comput. Concrete, 7(1), 1-16. https://doi.org/10.12989/cac.2010.7.1.001
  10. MacGregor, J.G. (1997), Reinforced Concrete Mechanics and Design, Prentice Hall.
  11. Manamoros, A.B. and Wong, K.H. (2003), "Design of simply supported deep beams using strut-and-tie models", ACI Struct. J., 100(6), 704-712.
  12. Pimentel, M., Cachim, P. and Figueiras, J. (2008), "Deep-beams with indirect supports: numerical modelling and experimental assessment", Comput. Concrete, 5(2), 117-134. https://doi.org/10.12989/cac.2008.5.2.117
  13. Rogowsky, D.M., MacGregor, J.G. and Ong, S.Y. (1986), "Tests of Reinforced Concrete Deep Beams", ACI Struct. J., 83(4), 614-623.
  14. Schlaich, J., Schafer, K. and Jennewein, M. (1987), "Toward a consistent design of structural concrete", PCI J., 32, 74-150. https://doi.org/10.15554/pcij.05011987.74.150
  15. Siao, W.B. (1995), "Deep beams revisited", ACI Struct. J., 92(1), 95-102.
  16. Sun, S.M. (2007), "Analytical Study on the Nonlinear Behavior of RC Transfer Girder", Master Thesis of Korea University. (in Korean)
  17. Tan, K.H., Teng, S., Guan, L.W. and Kong, F.K. (1995), "High strength concrete deep beams with effective span and shear span variations", ACI Struct. J., 92(4), 395-405.
  18. Tang, C.Y. and Tan, K.H. (2004), "Interactive mechanical models for shear strength of deep beams", J. Struct. Eng.-ASCE, 130(10), 1534-1544. https://doi.org/10.1061/(ASCE)0733-9445(2004)130:10(1534)
  19. Wu, T. and Li, B. (2009), "Experimental verification of continuous deep beams with openings designed using strut-and-tie modeling", IES J. Part A., Civil Struct. Eng., 2(4), 282-295. https://doi.org/10.1080/19373260903141454
  20. Yang, K.H. and Ashour, A.F. (2008), "Effectiveness of web reinforcement around openings in continuous concrete deep beams", ACI Struct. J., 105(4), 414-424.
  21. Yang, K.H., Chung, H.S. and Ashour, A.F. (2007), "Influence of shear reinforcement on reinforced concrete continuous deep beams", ACI Struct. J., 104(4), 420-429.
  22. Zararis, D. (2003), "Shear compression failure in reinforced concrete deep beams", J. Struct. Eng.-ASCE, 129(4), 544-553. https://doi.org/10.1061/(ASCE)0733-9445(2003)129:4(544)
  23. Zhang, N. and Tan, K.H. (2007), "Direct strut-and-tie model for single span and continuous deep beams", Eng. Struct., 29(12), 2987-3001. https://doi.org/10.1016/j.engstruct.2007.02.004
  24. Zhang, N. and Tan, K.H. (2010), "Effect of support settlement on continuous deep beams and STM modeling", Eng. Struct., 32(2), 361-372. https://doi.org/10.1016/j.engstruct.2009.09.019

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