Bond over direct support of deformed rebars in normal and high strength concrete with and without fibers

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• 作者：Avraham N. Dancygier (1)
  Amnon Katz (1)
  
• 关键词：Bond ; Support conditions ; Deformed rebars ; High strength concrete ; Steel fibers ; Confinement
• 刊名：Materials and Structures
• 出版年：2012
• 出版时间：2 - January 2012
• 年：2012
• 卷：45
• 期：1
• 页码：265-275
• 全文大小：1446KB
• 参考文献：1. Nawy EG (1996) Fundamentals of high strength high performance concrete. The State University of New Jersey, New Brunswick
  2. Fib (2008) Constitutive modeling of high strength/high performance concrete—state of the art report. Bulletin No. 42, Muller HS convener, Fédération Internationale du Beton, Sprint-Digital-Druck, Stuttgart
  3. Ichinose TY, Kanayama Y, Inoue Y, Bolander JE Jr (2004) Size effect on bond strength of deformed bars. Constr Build Mater 18:549-58 CrossRef
  4. Zuo J, Darwin D (2000) Splice strength of conventional and high relative rib area bars in normal and high-strength concrete. ACI Struct J 97(4):630-41
  5. Plizzari GA (1999) Bond and splitting crack development in normal and high strength fiber reinforced concrete. In: 13th Engineering mechanics division conference—EMD99, Baltimore, MD, USA (on CD)
  6. Bamonte PF, Gambarova PG (2007) High-bond bars in NSC and HPC: study on size effect and on the local bond stress-slip law. ASCE J Struct Eng 133(2):225-34 CrossRef
  7. Darwin D, Zuo J, Tholen ML, Idun EK (1996) Development length criteria for conventional and high relative rib area reinforcing bars. ACI Struct J 93(3):1-3
  8. International Standard ISO 15630-1 (2002) Steel for the reinforcement and prestressing of concrete—test methods—part 1: reinforcing bars, wire rod and wire. ISO 15630-1:2002(E), First edition 2002-04-15, Geneva
  9. Esfahani MR, Kianoush MR (2005) Development/splice length of reinforcing bars. ACI Struct J 102(1):22-0
  10. Comite Euro-International du Beton (1993) CEB-FIP model code 1990, design code. Thomas Telford, London, pp 83-4
  11. European Committee for Standardization (2004) Eurocode 2: design of concrete structures—part 1-1: general rules and rules for buildings. European Standard EN 1992-1-1. CEN
  12. Dancygier AN, Katz A, Wexler U (2010) Bond between deformed reinforcement and normal and high strength concrete with and without fibers. Mater Struct 43(6):839-56 CrossRef
  13. Rilem/CEB/FIP (1970) Bond test for reinforcing steel: beam test. Mater Struct 3(15):169-74
  14. Dancygier AN, Katz A (2008) The combined effect of concrete strength and geometric parameters on concrete-reinforcement bond. In: Proceedings of the 8th international symposium on utilization of high-strength and high-performance concrete, S1-1-3, Tokyo, Japan, pp 357-62
  
• 作者单位：Avraham N. Dancygier (1)
  Amnon Katz (1)
  
  1. Department of Structural Engineering and Construction Management, Faculty of Civil and Environmental Engineering, National Building Research Institute, Technion-Israel Institute of Technology, 32000, Technion City, Haifa, Israel
  
• ISSN：1871-6873

文摘

This paper describes results of the second stage of a research on the bonding of deformed bars in normal and high strength concrete with and without fibers. The current study focused on the effect of confinement conditions, which are present over a direct support of a reinforced concrete beam, and compares these results with data obtained in the first stage of the research. The experimental work consisted of pullout tests, which were based on the standard RILEM flexural bond test (“beam test- of deformed steel bars with diameters of 12 and 20?mm. Results revealed an increase in the normalized bond strength due to support conditions. An unstable post-peak slip of the tested rebar was observed when located over the support, whereas bars bonded near mid-span exhibited controlled bond–slip throughout the test. Up to peak load, however, bond–slip relations exhibited higher energy absorption over the support than near mid-span. Inclusion of fibers had only a minor effect on bond strength but had a significant influence on pre-peak energy absorption. A previously developed model of bond strength shows good agreement with current results when applying an increase factor due to the support effect.