Shear behavior of reinforced concrete wide beams strengthened with CFRP sheet without  stirrups

Ali Laftah Abass; Yousif Rasheed Hassan

doi:10.24237/djes.2019.12110

Authors

Ali Laftah Abass
alilaftast76@yahoo.com
Department of Civil Engineering, College of Engineering, Diyala University, Iraq
Yousif Rasheed Hassan Department of Civil Engineering, College of Engineering, Diyala University, Iraq

Keywords:

RC wide beams, strengthened beams, carbon fiber, shear failure

Abstract

Reinforced concrete wide beams (WBS) have been used in construction buildings because its provide many advantages; reducing the reinforcement congestion, reducing the quantity of the required formwork, providing simplicity for replication, and decreasing the storey height. The current study presents the results of four full-scale wide RC beams in order to study their shear behavior and investigate the effectiveness of carbon fiber reinforced polymer (CFRP) when using as shear reinforcement to improve the shear capacity of wide RC beams, one these beams was fabricated by (ANSYS) program this beam was unstrengthened with CFRP and without stirrups (control beam), the other two beams was strengthened with vertical and inclined CFRP sheet without stirrups and the last beam reinforced with shear stirrups (WBS). All beams casted with normal concrete strength (30 MPa), simply supported and under two point loads. The performances of these beams were measured in terms of; ultimate load, crack patterns, concrete and steel strains, deflection, and mode of failure. The results showed an increasing in ultimate load of strengthened beams with inclined, vertical CFRP and beam with shear reinforcement by (19.9%), (7.14%) and (39.8%) respectively as compared with the control beam, and this results means possibility of replacing the internal shear reinforcement with externally bonded CFRP.

Downloads

Download data is not yet available.

References

F. López-Almansa and et al., Vulnerability Analysis Of RC Buildings With Wide Beams Located In Moderate Seismicity Regions, Engineering Structures 46, (2013), pp. 687–702.

. Antonio Conforti and Giovanni A. Plizzari, Wide-Shallow Beams With And Without Steel Fibers, A Peculiar Behavior In Shear And Flexure, part B 51, (2013), pp. 282-290, journal homepage: www.elsevier.com/locate/compositesb.

. A.M. Elsouri and M.H. Harajli., Interior RC wide beam-narrow column joints: potential for improving seismic resistance, Engineering structures 99, (2015), pp. 42-55.

. S.E. Mohammadyan-Yasouj, and et.al., Wide Beam Shear Behavior With Diverse Types Of Reinforcement, ACI Structural Journal, MS, No. S-2013-360.R4, 2013.

. Teng J. G., Chen J. F., Smith S. T., and Lam L., FRP Strengthened RC Structures, John Wiley & Sons, Ltd, England,p.p 245, 2002.

. Ehab M. Lotfy, Hassan A. Mohamadien, Hussein Mokhtar Hassan. November, Effect Of Web Reinforcement On Shear Strength Of Shallow Wide Beams, International Journal of Engineering and Technical Research (IJETR). ISSN: 2321-0869, 2, Issue-11, (2014).

. M. Said, T.M. Elrakib., Enhancement Of Shear Strength And Ductility For Reinforced Concrete Wide Beams Due To Web Reinforcement, HBRC Journal, (2013).

. Ahmed B. Shuraim. March, Transverse Stirrup Configurations In RC Wide Shallow Beams Supported On Narrow Columns, journal of structural engineering © ASCE, (2012).

. Adam S. Lubell, , Evan C. Bentz, and Michael P. Collins. March – April, Shear Reinforcement Spacing In Wide Members, ACI Structural Journal, 106, (2), (2009), pp. 205-214.

. ACI Committee 318-02, Building Code Requirements For Structural Concrete (ACI 318-02) And Commentary (318R-02), Farmington Hills: American Concrete Institute, 2002.

. The Iraqi standards / No. 45, Used In The Concrete And Construction Aggregates, the Iraqi body specifications and standards, the Planning Board , Baghdad, 1984.

. ASTM A615/615M-05a., Standard Specification For Deformed And Plain Carbon Structural Steel Bars For Concrete Reinforcement, Annual Book of ASTM Standards, Vol(01.02), 2005.

. ACI committee 440.2R-08., Guide For The Design And Construction Of Externally Bonded FRP Systems For Strengthening Concrete Structures, American Concrete Institute, Michigan, USA, p.(8), 2008.

. British Standards Institution. (2009), Code of Practice for Design and Construction (BS EN 12390-3: 2009), British Standards Institution, London.

. ASTM Designation C39-86., Compressive Strength of Cylindrical Concrete Specimens, Annual Book of ASTM Standards ,American Society for Testing and Materials, Philadelphia,Pennsylvania ,Section 4,Vol.(04.02), 1986.

. ASTM Designation C496-96., Standard specification for splitting tensile strength of cylindrical concrete specimens, Annual Book of ASTM Standards, American Society for Testing and Material, Philadelphia, Pennsylvania, Section 4, Vol. (4.02), pp (1-4), 1996.

. ASTM Designation C78-02., Standard Specification For Testing Method For Flexural Strength Of Concrete (Using Simple Beam With Third-Point Loading), Annual Book of ASTM Standards, American Society for Testing and Material, Philadelphia, Pennsylvania, Section 4, Vol.(4.02), (2002), pp. 32-34.