Determination of Bond Capacity in Reinforced Concrete Beam and Its Influence on the Flexural Strength

<- Back to II. Mechanical Engineering & Physics Vol. 6

Cite the paper

Mohammad Rashidi & Hana Takhtfiroozeh (2016). Determination of Bond Capacity in Reinforced Concrete Beam and Its Influence on the Flexural Strength. Mechanics, Materials Science & Engineering Vol.6, pp. 135-144, doi: 10.13140/RG.2.2.18300.95361

Authors: Mohammad Rashidi, Hana Takhtfiroozeh

ABSTRACT. This paper presents results of an experimental investigation of actual performance of the reinforced concrete beam in bond under flexure, when reinforced with tension steel is going to consider. In this experiment four specimens of beam and a bar in the middle of the width of the beam has been used and 2.5 cm of concrete cover has been considered from the center of the bar. In addition, transverse bars have been used to reassure lack of shear yield at the two ends of the beam. Flexural bar has been put in the middle of the beam symmetrically and the length of the flexural bar in each of the samples shall be: 15, 20, 30 and 40 cm. Three cylindrical samples were made in order to determine f’c and were examined at 28 days and the compressive strength of concrete used in this study was about 35 MPa. The beam samples were examined after 28 days via two-point loading system. Based on the results, increasing the length of bar causes increase of flexural strength. The presence of longitudinal rebar resulted in the ultimate momentum to be more than the crack momentum of the cross-section in parts which have broken at the point of longitudinal bar cut.

Keywords: flexural strength, bond capacity, tensile bars, reinforced concrete beam, compressive strength

DOI 10.13140/RG.2.2.18300.95361


[1] Darwin, D., Zuo, J., Tholen, M.L., and Idun, E.K., Develpomnet length criteria for conventional and high relative rib area reinforcing bars, ACI Structural Journal, No. 3, 93, 347-359, 1993.

[2] Orangun, C.O., and Breen, J. E., Strength of anchored bars: A re-evaluation of test data on development length and splices, Research Report No. 154-3F, Center for Highway Research, University of texas at Austin, Austin, Tex., 78, 1975.

[3] Orangun, C. O., and Breen, J. E., Reevaluation of test data on development length and splices, ACI Journal, Proceedings, No. 3, 74, 114-122, 1977.

[4] Zuo, J., and Darwin, D., Splice strength of conventional and high relative rib area bars and high strength concrete, ACI Structural Journal, No. 4, 97, 630-641, 2000.

[5] Rehm G, Uber die grundlagen des verbudzwischen stahl undbeton, Heft 138, Deutscher Ausschuss fur Stahlbeton, Berlin, 1961.

[6] Goto Y., Cracks formed in concrete around deformed bars in concrete. ACI Journal 68(2) 244-251, 1971.

[7] Mathey RG and W Watstein D, Investigation of bond in beam and pull out specimens with high yield strength deformed bars. ACI Journal T. No.57-50 1071-1089, 1961.

[8] Ferguson PM, Robert I and Thompson JN, Development length of high strength reinforcing bars in bond. ACI Journal T. No.59-17 887-922, 1962.

[9] Lutz LA and Gergely P, Mechanics of bond and slip of deformed bars in concrete. ACI Materials Journal T. No. 64-62 711-721, 1967.

[10] Nilson AH, Internal measurement of bond slips. ACI Journal 69(7) 439-441, 1972.

[11] Jiang DH, Shah SP and Andonian AT. Study of the transfer of tensile forces by bond. ACI Journal T. No.81-24 251-258, 1984.

[12] Ueda T, Lin I and Hawkins NM, Beam bar anchorage in exterior column-beam connections. ACI Structural Journal T. No. 83-41 412-422, 1986.

[13] Soroushian P, Pull out behavior of hooked bars in exterior beam-column connections. ACI Structural Journal 85 269-276, 1988.

[14] Soroushian P and Choi KB, Local bond of deformed bars with different diameters in confined concrete. ACI Structural Journal 86(02) 217-222, 1989.

[15] Soroushian P, Choi KB, Park GH and Aslani F, Bond of deformed bars to concrete: effects of confinement and strength of concrete. ACI Materials Journal 88(3) 227-232, 1991.

[16] Abrishami HH and Mitchel D, Simulation of uniform bond stress. ACI Materials Journal T. No. 89-M18 89(2) 161-168, 1992.

[17] Malvar LJ, Bond of reinforcement under controlled confinement. ACI Materials Journal 89(6) 593-601, 1992.

[18] Yankelevsky DZ, Adin MA and Farhey DN, Mathematical mode0l for bond slip behavior under cyclic loading. ACI Structural Journal 89(6) 692-698, 1992.

[19] Bortolotti , Strength of concrete subjected to pull out load. ASCE Materials Journal 15(5) 491-495, 2003.

[20] Harajli MH, Hamad BS and Rteil AA, Effect of confinement on bond strength between steel bars and concrete. ACI Structural Journal 101(5) 595-603, 2004. DOI: 10.14359/13381

[21] Somayaji S and Shah SP, Bond stress versus slip relationship and cracking response of tension members. ACI Journal 78(3) 217–225, 1981.

[22] Azizinamini A, Stark M, Roller JJ and Ghosk SK, Bond performance of reinforcing bars embedded in HSC. ACI Structural Journal 90(5) 554–561, 1993.

[23] Azizinamini A, Pavel R, Hatfield E and Ghosh SK, Behavior of spliced reinforcing bars embedded in HSC. ACI Structural Journal 96(5) 826–835, 1999.

[24] Azizinamini A, Darwin D, Eligehausen R, Pavel R and Ghosh SK, Proposed modification to ACI 318-95 tension development and lap splice for high strength concrete. ACI Structural Journal 96(6) 922–926, 1999.

[25] CEB-FIP Report, Bond of reinforcement in concrete: state of the art report. FIB Bulletin-10, Switzerland, 2000.

Creative Commons Licence
Mechanics, Materials Science & Engineering Journal by Magnolithe GmbH is licensed under a Creative Commons Attribution 4.0 International License.
Based on a work at