Ductility of FRP plated flexural members

Abstract The design of reinforced concrete (RC) flexural members such as beams, slabs and columns is intrinsically based on the inherent ductility of the member. In reinforced concrete beams and slabs, ductility is generally achieved by using ‘under-reinforced’ sections and generally governed by the neutral axis depth parameter k u which requires ultimate failure by concrete crushing at a specified strain e c . As the plates of fibre reinforced polymer (FRP) plated RC beams can fracture or debond before the concrete crushes at e c , the k u approach is not directly applicable. Hence, new fundamental approaches and a deeper understanding of ductility are required which are the subjects of this paper.

[1]  M. Haskett,et al.  Moment Redistribution in RC Beams Retrofitted by Longitudinal Plating , 2006 .

[2]  Mark A. Bradford,et al.  Composite Steel and Concrete Structural Members: Fundamental Behaviour , 1995 .

[3]  H. A. Sawyer,et al.  Design of Concrete Frames For Two Failure Stages , 1965 .

[4]  P. R. Barnard,et al.  The Collapse of Reinforced Concrete Beams , 1965 .

[5]  Deric J. Oehlers,et al.  Moment redistribution in continuous plated RC flexural members. Part 2: Flexural rigidity approach , 2004 .

[6]  W. Corley.  Rotational Capacity of Reinforced Concrete Beams , 1966 .

[7]  Deric J. Oehlers,et al.  Tests on the Ductility of Reinforced Concrete Beams Retrofitted with FRP and Steel Near-Surface Mounted Plates , 2006 .

[8]  Deric J. Oehlers,et al.  Design of FRP and Steel Plated RC Structures: Retrofitting Beams and Slabs for Strength, Stiffness and Ductility , 2004 .

[9]  P R Barnard,et al.  PLASTIC BEHAVIOUR OF CONTINUOUS COMPOSITE BEAMS , 1965 .

[10]  Deric J. Oehlers,et al.  The Gradual Formation of Hinges Throughout Reinforced Concrete Beams , 2005 .

[11]  Daniele Ferretti,et al.  Flexural Deformability of Reinforced Concrete Beams , 1998 .

[12]  Flexural Mechanics of Reinforced Concrete , 1965 .

[13]  D. Oehlers,et al.  Moment Redistribution in FRP and Steel-Plated Reinforced Concrete Beams , 2006 .

[14]  Gaetano Manfredi,et al.  A refined R.C. beam element including bond-slip relationship for the analysis of continuous beams , 1998 .

[15]  R. Di Marco,et al.  Bending moment-mean curvature relationship with constant axial load in the presence of tension stiffening , 1993 .

[16]  P R Barnard,et al.  ULTIMATE STRENGTH OF COMPOSITE BEAMS , 1965 .