Flexural Behavior of Prestressed Dual Concrete Beams

프리스트레스트 이중 콘크리트 보의 휨 거동 해석

  • Park Tae-Hyo (Dept. of Civil Engineering, Hanyang University) ;
  • Yun Sung-Hwan (Dept. of Civil Engineering, Hanyang University) ;
  • Yun Hee-Dae (Dept. of Civil Engineering, Hanyang University)
  • Published : 2005.06.01


Cracks due to low tensile strength in prestressed concrete (PC) beams may decrease rigidity and structural performance, resulting in excessive deflection. In an effort to solve this problem, in this research, prestressed dual concrete (PDC) has been proposed, consisting of normal strength concrete in compression zone, and high performance steel fiber reinforced concrete(HPSFRC) with a partial depth in tensile zone. Three PDC beams with different depths of HPSFRC and two PC beams were cast for experiments. Analytical models at each stage, i.e., precracking, postcracking, and ultimate, were proposed for analysis of flexural behavior in PDC beams. The experimental results agree well to the analytical ones. Crack formation and its propagation are controlled by the HPSFRC in PDC beams. The initial cracking and service limit loads are increased along with the load carrying capacity and flexural stiffness.


  1. 박대효, 부준성, 조백순, '섬유보강 고인장강도 콘크리트를 이용한 이중 콘크리트보의 휨 거동 해석', 콘크리트학회논문집, 13권, 6호, 2001, pp.534-592
  2. Swamy, R. N. and Al-Taa'n S. A., 'Deformation and Ultimate Strength in Flexure of Reinforced Concrete Beams Made with Steel Fiber Concrete', ACI Journal, Vol.78, No.5, 1981, pp.395-405
  3. Swamy, R. N., Al-Taa'n S. A., and Ali, Sami A. R., 'Steel Fibers for Controlling Cracking and Deflection', Concrete International: Design and Construction, Vol.1, No.8, 1979, pp.41-49
  4. Padmarajaiah, S. K. and Ramaswamy, A., 'Crack-Width Prediction for High-Strength Concrete Fully and Partially Prestressed Beam Spectimens Containing Steel Fibers', ACI Structural Journal, Vol.98, No.6, 2001, pp.852-861
  5. Padmarajaiah, S. K. and Ramaswamy, A., 'Flexural Strength Predictions of Steel Fiber Reinforced High-Strength Concrete in Fully/Partially Prestressed Beam Specimens', Cement & concrete composites, Vol.26, No.4, 2002, pp.275-290
  6. Henager, C. H. and Doherty, T. J., 'Analysis of Reinforced Fibrous Concrete Beams', Journal of the Structural Division, ASCE, Vol.12, No.1, 1976, pp.177-188
  7. Swamy , R. N. and Mangat, P. S., 'The interfacial Bond Stress in Steel Fiber Cement Composites', Cement and Concrete Research, Vol.6, No.5, 1976, pp.641-649
  8. Romualdi, James P. and Mandel, James A., 'Tensile Strength of Concrete as Affected by Uniformly Distributed and Closely Spaced Short Lengths of Wire Reinforcement,' ACI Journal, Vol.61, No.6, 1934, pp.657-671
  9. Cox, H, L., 'The Elasticity and Strength of Paper and Other Fibrous Materials', British Journal of Appllied Physics, Vol.3, No.3, 1952, pp.72-79