Shear Strength and Behavior of Reinforced Concrete Corbels Containing either Carbon Fibers or Stirrups

Sanaa Ismael Khaleel, Bayan Anwer Ali, Zrar Sedeeq Othman

Abstract


In the present paper, an experimental research is presented regarding the shear strength and behavior of concrete corbels with carbon fiber or stirrups as shear reinforcement. Tests were carried out on ten120 x 250 x 250 mm corbels subjected to vertical loading. The influence of concrete grade type (normal and moderately high strength concretes), carbon fiber percentage and of the percentage of the horizontal shear reinforcement on the shear strength of the corbels were considered. The test results in term of load-deflection curves and crack patterns show that the shear strength and deformation capacity was improved with the increase in the percentage of carbon fibers in reinforced concrete corbels. These clearly demonstrate the benefits of using carbon fiber as shear reinforcement in combination (fibers and stirrups) or as replacement for stirrups. An equation was proposed for predicting the shear strength of the reinforced concrete corbels subjected to vertical load. The equation was compared with equations given by ACI 318-14. The ACI equations were more conservative for predicting the ultimate shear strength of all corbels.


Full Text:

PDF

References


REFERENCES

ACI (2014): ACI Committee 318.Building Code Requirements for Structural Concrete. American Concrete Institute. Farmington Hills, Mich., 193.

ACI (2002): ACI 544.1R-96 State-of-the-Art Report on Fiber Reinforced Concrete.

Al-Zahawi S.K. (2011). Shear Strength and Behavior of Reinforced Concrete Corbels with and without Carbon Fibers. PhD Thesis, University of Sulaimani, Kurdistan-Iraq.

Aziz, O. Q. and Othman, Z. S. (2010). Ultimate Shear Strength of Reinforced High Strength Concrete Corbels Subjected to Vertical Load. Al-Rafidain Eng. J., 18 (1), 1-12.

Campione, G., La Mendola, L.,and Papia, M. (2005).Flexural Behaviour of Concrete Corbels Containing Steel Fibers or Wrapped with FRP Sheets. J. Mater.andStruct., 38(280), 617-625.

Campione, G., Mendola, L., and Mangiavillano, M. (2007). Steel Fiber-Reinforced Concrete Corbels: Experimental Behavior and Shear Strength Prediction. J. ACI Struct., 104 (5) , 570-579.

Campione, G. (2009). Performance of Steel Fibrous Reinforced Concrete Corbels Subjected to Vertical and Horizontal Loads. J. Struct. Eng., 135(5), 519-529.

Chakrabarti, P. R., Farahani, D. J.,and Kashou, S. I., (1989). Renforced and Precompressed Concrete Corbels- an Experimental Study.ACI Stru.J. , 86(4), 405-412.

Fattuhi, N. I. (1986). Corbels with Shear Reinforcement in the form of Stirrups or Fibers, Third International Symposium on Developments in Fiber Reinforced Cement and Concrete, Sheffield, 13-17 July, V. 2, Paper 8.8.

Fattuhi, N. I. and Hughes, B. P. (1989). Ductility of Reinforced Concrete Corbels Containing Either Steel Fibers or Stirrups.J. ACI Struct., 86(6), 644-651.

Fattuhi,N. I. (1990a). ColumnLoad Effect on Reinforced Concrete Corbels. J. Struct. Eng., 116(1), 188-197.

Fattuhi,N. I. (1990b). Strength of SFRC Corbels Subjected to Vertical Load. J. Struct. Eng., 116(3), 701-718.

Fattuhi, N. I. (1994). Reinforced Corbels Made with Plain and Fibrous Concretes. J. ACI Struct., 91(5), 530-536.

Kriz, L. B. and Raths, C. H. (1965). Connections in Precast Concrete Structure-Strength of Corbels, PCI J., 10 (1),16-61.

Kumar, S. (2004). Shear strength of reinforced steel fibrous concrete corbels without shear reinforcement. Journal of the Institution of Engineers. India. Civil Engineering Division, 85(nov), 202-212.

Mattock, A.H., Chen, K.C. and Soongswang, K. (1976). The behavior of reinforced concrete corbels. PCI Journal, 21(2), 52-77.

Muhammad, A. H.(1998). Behavior and Strength of High-Strength Fiber Reinforced Concrete Corbels Subjected to Monotonic or Cyclic (repeated) Loading. PhD thesis presented to the University of Technology, Baghdad, Dec., 1-172.

Yang, J., Lee, J., Yoon, Y., Cook, W.; and Mitchell D. (2012). Influence of Steel Fibers and Headed Bars on the Serviceability of High-Strength Concrete Corbels. J. Struct. Eng., 138(1), 123-129.

Young, Y. K. and Balaguru, P. (1994). Behavior of Reinforced High-Strength Concrete Corbels. J. Stru. Eng. ASCE , 120(4), 1182-1201.

Young, Y. K., McCloskey, D.H., and Naway, E. G. (1985). Reinforced Corbels of High-Strength Concrete. Special Publication, 87, 197-212.

Yousif, A. R., Aziz, O. Q., and Muhammad, A. H. (2004). Size Effect on Shear Failure of High-Strength Reinforced Concrete Corbels without stirrups. Zanco Journal of Pure and Applied Sciences.16(1), 5-15.

Zeller, W. (1991).Conclusions from Tests on Corbels. IABSE Colloquium, Structural Concrete, International Association for Bridge and Structural Engineering, Stuttgart, 577-582.




Copyright (c) 2017 ZANCO Journal of Pure and Applied Sciences

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

ZANCO Journal of Pure and Applied Sciences (print version: ISSN 2218-0230 online version: ISSN 2412-3986, DOI: 10.21271) is published by Salahaddin University-Erbil / Department of Scientific Publications. Responsibility for the contents rests upon the authors and not upon  Salahaddin University-Erbil or the Journal Editorial and Advisory Boards. 

Department of Scientific Publication Office: The Central Library of Salahaddin University-Erbil, Kirkuk Road, Erbil, Kurdistan, Iraq. Cell Phone: +964 (0)750 7761675, email: zanco.scientific@su.edu.krd. www.su.edu.krd, www.zancojournals.su.edu.krd

Copyright and Reprint Permission: It is the policy of ZANCO to own the copyright to the technical contributions it publishes and to facilitate the appropriate reuse of this material by others. Photocopying is permitted with credit to the source for individuals for individual use.

Copyright © 2017. All Rights Reserved. Salahaddin University-Erbil