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International journal of concrete structures and materials v.4 no.1, 2010년, pp.63 - 68  
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Simplified Design Equation of Lap Splice Length in Compression

Chun, Sung-Chul    (Daewoo Institute of Construction Technology   ); Lee, Sung-Ho    (Daewoo Institute of Construction Technology   ); Oh, Bo-Hwan    (Daewoo Institute of Construction Technology  );
  • 초록

    With the emergence of ultra-high strength of concrete, the compression lap splice has become an important area of interest. According to ACI 318-08, a compression splice can be longer than a tension splice when high-strength concrete is used. By reevaluating the test results of compression splices and performing regression analysis, a simplified design equation for splice length in compression was developed based on the basic form of design equations for development/splice lengths of deformed bars and hooks in tension. A simple linear relation between $l_s/d_b$ and $f_{sc}\sqrt{f'_c}$ was assumed, and yields good values for the correlation coefficient and the mean and the COV (coefficient of variation) of the ratios of tests to predictions of splice strengths in compression. By including the 5% fractile coefficient of 0.83, a design equation for splice length in compression was developed. The splice length calculated using the proposed equation has a reliability that is equivalent to other provisions for reinforcing bars.


  • 주제어

    compression lap splice .   bond .   end bearing .   transverse reinforcement .   specified splice strength.  

  • 참고문헌 (14)

    1. ACI Committee 318, Building Code Requirements for Structural Concrete (ACI 318-08) and Commentary, American Concrete Institute, Farmington Hills, Mich., 2008, 465 pp. 
    2. Pfister, J. F. and Mattock, A. H., “High Strength Bars as Concrete Reinforcement, Part 5: Lapped Splices in Concentrically Loaded Columns,” Journal, PCA Research and Development Laboratories, Vol. 5, No. 2, 1963, pp. 27-40. 
    3. Chun, S. C., Lee, S. H., and Oh, B., “Compression Lap Splice in Unconfined Concrete of 40 and 60 MPa Compressive Strengths,” ACI Structural Journal, Vol. 107, No. 2, 2010, pp. 170-178. 
    4. Chun, S. C., Lee, S. H., and Oh, B., “Compression Lap Splice Length in Concrete of Compressive Strength from 40 to 70 MPa (in Korean),” Journal of the KCI, Vol. 21, No. 4, 2009, pp. 401-408.     
    5. Orangun, C. O., Jirsa, J. O., and Breen, J. E., “A Reevaluation of Test Data on Development Length and Splices,” ACI Journal, Vol. 74, No. 3, 1977, pp. 114-122. 
    6. Canadian Standard Associate, CSA A23.3-04, Design of Concrete Structures, Ontario, Canada, 2004, 214 pp. 
    7. New Zealand Standard, Concrete Structures Standard, Wellington, New Zealand, 2006. 
    8. CEB-FIP, FIP Recommendations; Practical Design of Structural Concrete, 1999, 113 pp. 
    9. Chun, S. C., Lee, S. H., and Oh, B., “Behavior and Capacity of Compression Lap Splice in Confined Concrete with Compressive Strength of 40 and 60 MPa (in Korean),” Journal of the KCI, Vol. 21, No. 4, 2009, pp. 389-400.     
    10. Cairns, J. and Arthur, P. D., “Strength of Lapped Splices in Reinforced Concrete Columns,” ACI Journal, Proceedings, Vol. 76, No. 2, 1979, pp. 277-296. 
    11. Cairns, J., “Strength of Compression Splices: A Reevaluation of Test Data,” ACI Journal, Proceedings, Vol. 82, No. 4, 1985, pp. 510-516. 
    12. Darwin, D., Idun, E. K., Zuo, J., and Tholen, M. L., “Reliability-Based Strength Reduction Factor for Bond,” ACI Structural Journal, Vol. 95, No. 4, 1998, pp. 434-443. 
    13. ISO 6935-2, Steel for the Reinforcement of Concrete - Part 2: Ribbed Bars-Second Edition, 2007, 20 pp. 
    14. Natrella, M. G., Experimental Statistics, National Bureau of Standards Handbook 91, United States Department of Commerce, 1966. 

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