Anchorage length of reinforcing bars in tension: an assessment of the Australian Standard AS 3600:2018
Tóm tắt
When designing a reinforced concrete member for strength, ductility and robustness, it is essential that a sufficient length of reinforcement is developed on both sides of a critical section in a zone of tension. The specifications of the existing codes of practice for calculating the development length of reinforcement are statistically based on test data mostly from small-scale pull-out and beam specimens, and their applicability outside the range of the test data is uncertain. This paper describes an experimental research program to assess the effects of different structural parameters on the development length requirements for modern high strength steel reinforcing bars, including the case of lapped splices in large-scale reinforced concrete members in bending. The factors of safety obtained in the tests are assessed according to the Australian Standard (AS3600:2018) provisions for the anchorage length of reinforcing bars in tension and also in terms of attainable average bond stress in different anchorage conditions. The study has revealed that modification(s) to two of the coefficients included in the provisions of AS3600:2018 would provide a more consistent and reliable factor of safety for the anchorage of reinforcement in large-scale concrete members, including at lapped splice locations.
Tài liệu tham khảo
ACI (2014). ACI 318-14: Building code requirements for structural concrete and commentary. ACI Committee 318, Michigan.
CEN. (2004). BS-EN-1992-1-1:2004 - Eurocode 2: Design of Concrete Structures Part 1-1: General Rules and Rules for Buildings. Brussels: European Committee for Standardization.
Darwin, D., Tholen, M. L., Edun, E. K., & Zuo, J. (1996). Splice strength of high relative rib area reinforcing bars. ACI Structural Journal,93(1), 95–107.
DIN. (2008). DIN 1045-1: Concrete, Reinforced and Prestressed Concrete Structures—Part 1: Design and Construction. Berlin: Deutsches Institut für Normung.
Gilbert, R. I., Chang, Z. T., & Mazumder, M. H. (2011). Anchorage of reinforcement in concrete structures subjected to cyclic loading. In Proceedings of 25th Biennial Conference of Concrete Institute of Australia Concrete-11, Perth.
Gilbert, R. I., Mazumder, M. H., & Chang, Z. T. (2012). Bond, slip and cracking within the anchorage length of deformed reinforcing bars in tension. In Proceedings of International Conference of the Bond in Concrete BIC-2012, Brescia.
Hamad, B. S., & Mansour, M. Y. (1996). Bond strength of noncontact tension lap splices. ACI Structural Journal,93(3), 316–326.
Kilpatrick, A. E., & Gilbert, R. I. (2012). A preliminary investigation of the strength and ductility of lapped splices of reinforcing bars in tension. In Proceedings of 22nd Australasian Conference on the Mechanics of Structures and Materials ACMMS 22, Sydney (pp. 305–311).
Mazumder, M. H., Gilbert, R. I., & Chang, Z. T. (2012a). Bond and anchorage length of deformed bars in tension: way forward for advanced formulations. In Proceedings of International Conference AARCV 2012, Kerala India (pp. 154–161).
Mazumder, M. H., Gilbert, R. I., & Chang, Z. T. (2012b). A reassessment of the analysis provisions for bond and anchorage length of deformed reinforcing bars in tension. Bonfring International Journal of Industrial Engineering and Management Science,2(4), 01–08.
Mazumder, M. H., Gilbert, R. I., & Chang, Z. T. (2013a). Anchorage of deformed reinforcing bars in tension: An outlook for advanced formulation of a bond-slip constitutive law. In Proceedings of ACMMS 22, Sydney (pp. 319–324).
Mazumder, M. H., Gilbert, R. I., & Chang, Z. T. (2013b). Analytical modelling of average bond stress within the anchorage of tensile reinforcing bars in reinforced concrete members. International Journal of Civil and Environmental Engineering,7(6), 392–398.
Rezansoff, T., Akanni, A., & Sparling, B. (1993). Tensile lap splices under static loading: A review of the proposed ACI318 code provision. ACI Structural Journal,90(4), 374–384.
Standards Australia (2018). AS 3600:2018- Australian Standard for Concrete Structures, BD-002: Concrete Structures, Sydney.