Current Science

Open Access Open Access  Restricted Access Subscription Access

Influential Parameters for Headed Bars in RC Beam-Column Joint


Affiliations
1 CSIR-Central Building Research Institute, Roorkee 247 667, India
2 Vellore Institute of Technology University, Vellore 632 014, India
 

RC beam-column joint, a critical region of a framed system often does not achieve adequate strength due to poor detailing and workmanship. Conventional anchors such as straight and hooked bars which anchor the flexural longitudinal bar terminating at the joint, have many design and construction drawbacks like steel congestion, leading to honey combing in concrete and difficulties in implementation. This led to the development of headed bars which are highly advocated by researchers, as they provide an alternative solution to conventional anchors. Various parameters such as head geometry, embedment depth, grade of concrete, etc. influence the behaviour of headed bar in the joints. This study presents a review on headed bar for the development of proper guidelines.

Keywords

Anchorage Capacity, Beam-Column Joints, Headed Bars, Hooked Bar, Pull-Out Capacity.
User
Notifications
Font Size

  • ACI Committee, American Concrete Institute and International Organization for Standardization, Building code requirements for structural concrete (ACI 318-08) and commentary. American Concrete Institute, 2008.

  • Mihaylov, B. I., Bentz, E. C. and Collins, M. P., Behavior of deep beams with large headed bars. ACI Struct. J., 2013, 110, 1013.

  • Chutarat, N. and Aboutaha, R. S., Cyclic response of exterior reinforced concrete beam-column joints reinforced with headed bars – experimental investigation. ACI Struct. J., 2003, 100, 259–264.

  • Thompson, M. K., Ziehl, M. J., Jirsa, J. O. and Breen, J. E., CCT nodes anchored by headed bars – Part 1: behavior of nodes. ACI Struct. J., 2005, 102, 808.

  • Kang, T. H., Ha, S. S. and Choi, D. U., Bar pull-out tests and seismic tests of small-headed bars in beam-column joints. ACI Struct. J., 2010, 107, 32.

  • Subramanian, N., Development length of reinforcing bars: need to revise Indian codal provisions. Indian Concr. J., 2005, 79, 39–46.

  • ACI-ASCE Committee 352, Recommendations for design of beam-column connections in monolithic reinforced concrete structures (ACI352R-02), American Concrete Institute, Farmington Hills, Michigan, US, 2002.

  • ASTM A970/A970M-07 standard specification for headed steel bars for concrete reinforcement, ASTM International, West Conshohocken, Pa, 2007.

  • Chang, C. J., High-strength reinforcement in exterior beam-column joints under cyclic loading. ACI Struct. J., 2017, 114, 1325.

  • Gond, S. and Kulkarni, S. M., Bond strength behaviour of headed reinforcement bar with varying embedment length. 6th International Conference on Structural Engineering and Construction Management, Kandy, Sri Lanka, 2015.

  • ASTM A970/A970M-98, Standard Specification for Headed Steel Bars for Concrete Reinforcement, ASTM International, West Conshohocken, PA, 1998.

  • Park, H. K., Yoon, Y. S. and Kim, Y. H., The effect of head plate details on the pull-out behaviour of headed bars. Mag. Concr. Res., 2003, 55, 485–496.

  • Kawale Abhijit and Patil Yogesh, D., Pull-out capacity and bond behaviour of headed reinforcement in concrete. Int. J. Innov. Res. Sci., Eng. Technol., 2016, 5, 12114–12119.

  • Kang, T. H., Shin, M., Mitra, N. and Bonacci, J. F., Seismic design of reinforced concrete beam-column joints with headed bars. ACI Struct. J., 2009, 106, 868.

  • Lee, H. J. and Yu, S. Y., Cyclic response of exterior beam-column joints with different anchorage methods. ACI Struct. J., 2009, 106, 329.

  • Soumya, A. T. and Bini, B., Alternate ductile detailing for beam column joints. SSRG Int. J. Civil Eng., 2017, 94–97.

  • Bakir, P. G. and Boduroglu, M. H., The ultimate load carrying capacity of concrete members with headed bars. 27th Conference on Our World in Concrete and Structures, 2002.

  • Lam, K. M., Kim, W. S., Van Zandt, M. and Kang, T. H., An experimental study of reinforced concrete beams with closelyspaced headed bars. Int. J. Concrete Struct. Mater., 2011, 5, 77– 85.

  • Choi, D. U., Test of headed reinforcement in pullout II: deep embedment. Int. J. Concr. Struct. Mater., 2006, 18, 151–159.

  • DeVries, R. A., Load distribution between bond and end-bearing for hooked and headed bars in concrete. In AEI, 2015, 269–227.

  • Rajagopal, S. and Prabavathy, S., Seismic behavior of exterior beam-column joint using mechanical anchorage under reversal loading: an experimental study. IJST-T Civ. Eng., 2014, 38, 345.

  • Chun, S. C., Choi, C. S. and Jung, H. S., Side-face blowout failure of large-diameter high-strength headed bars in beam-column joints. ACI Struct. J., 2017, 114, 161.

  • Tasai, A., Kusunoki, K., Kiyohara, T. and Adachi, T., Structural performance of reinforced concrete roof exterior beam column joint with headed bars. In Proceedings of the 15th World Conference on Earthquake Engineering, Lisboa, 2012.

  • Kang, T. H. K., Recommendations for design of RC beam-column connections with headed bars subjected to cyclic loading. Proc. 14WCEE, 2008.

  • Thompson, M. K., Jirsa, J. O. and Breen, J. E., CCT nodes anchored by headed bars-Part 2: capacity of nodes. ACI Struct. J., 2006, 103, 65.

  • Mancuso, C. and Bartlett, F. M., ACI 318-14 criteria for computing instantaneous deflections. ACI Struct. J., 2017, 114, 1299.


Abstract Views: 248

PDF Views: 76




  • Influential Parameters for Headed Bars in RC Beam-Column Joint

Abstract Views: 248  |  PDF Views: 76

Authors

Ajay Chourasia
CSIR-Central Building Research Institute, Roorkee 247 667, India
Shipali Gupta
Vellore Institute of Technology University, Vellore 632 014, India

Abstract


RC beam-column joint, a critical region of a framed system often does not achieve adequate strength due to poor detailing and workmanship. Conventional anchors such as straight and hooked bars which anchor the flexural longitudinal bar terminating at the joint, have many design and construction drawbacks like steel congestion, leading to honey combing in concrete and difficulties in implementation. This led to the development of headed bars which are highly advocated by researchers, as they provide an alternative solution to conventional anchors. Various parameters such as head geometry, embedment depth, grade of concrete, etc. influence the behaviour of headed bar in the joints. This study presents a review on headed bar for the development of proper guidelines.

Keywords


Anchorage Capacity, Beam-Column Joints, Headed Bars, Hooked Bar, Pull-Out Capacity.

References





DOI: https://doi.org/10.18520/cs%2Fv116%2Fi10%2F1666-1673