Browse > Article
http://dx.doi.org/10.12989/sem.2005.21.3.333

Seismic shear strengthening of R/C beams and columns with expanded steel meshes  

Morshed, Reza (Department of Civil Engineering, Yazd University)
Kazemi, Mohammad Taghi (Department of Civil Engineering, Sharif University of Technology)
Publication Information
Structural Engineering and Mechanics / v.21, no.3, 2005 , pp. 333-350 More about this Journal
Abstract
This paper presents results of an experimental study to evaluate a new retrofit technique for strengthening shear deficient short concrete beams and columns. In this technique a mortar jacket reinforced with expanded steel meshes is used for retrofitting. Twelve short reinforced concrete specimens, including eight retrofitted ones, were tested. Six specimens were tested under a constant compressive axial force of 15% of column axial load capacity based on original concrete gross section, $A_g$, and the concrete compressive strength, ${f_c}^{\prime}$. Main variables were the spacing of ties in original specimens and the volume fraction of expanded metal in jackets. Original specimens failed before reaching their nominal calculated flexural strength, $M_n$, and had very poor ductility. Strengthened specimens reached their nominal flexural strength and had a ductility capacity factor of up to 8 for the beams and up to 5.5 for the columns. Based on the test results, it can be concluded that expanded steel meshes can be used effectively to strengthen shear deficient concrete members.
Keywords
expanded steel mesh; concrete; short column; ductility; shear strength; retrofit; strengthening;
Citations & Related Records

Times Cited By Web Of Science : 4  (Related Records In Web of Science)
Times Cited By SCOPUS : 3
연도 인용수 순위
1 Abdullah and Takiguchi, K. (2003), 'An investigation into the behavior and strength of reinforced concrete columns strengthened with ferrocement jackets', Cement & Concrete Composites, 25(2), 233-242   DOI   ScienceOn
2 Aboutaha, R.S., Engelhardt, M.D., Jirsa, J.O. and Kreger, M.E. (1996), 'Seismic retrofit of RIC columns using steel jackets', ACI Special Publication SP-160, Seismic Rehabilitation of Concrete Structures, 59-72
3 ACI Committee 318 (2002), 'Building code requirements for structural concrete (ACI 318-02) and commentary (ACI 318R-02)', American Concrete Institute, USA
4 ACI Committee 549 (1993), 'Guide for the design, construction, and repair of ferrocement (ACI 549.1 R-93),' American Concrete Institute, MI, USA
5 Bazant, Z.P. and Kazemi, M.T. (1991), 'Size effect on diagonal shear failure of beams without stirrups', ACI Struct. J., 88(3), 268-276
6 Bett, B.J., Klinger, R.E. and Jirsa, J.O. (1988), 'Lateral load response of strengthened and repaired reinforced concrete columns', ACI Struct. J., 85, 499-508
7 Katsuma, H., Kobatake, Y. and Takeda, T. (1988), 'A study on the strengthening with carbon fiber for earthquake resistant capacity of existing reinforced concrete columns', Proc. of the Ninth World Conf. on Earthquake Engineering, Tokyo-Kyoto, Japan, VII, 517-522
8 Khaloo, A.R. and Morshed, R. (2000), 'Behavior of concrete slabs reinforced with expanded steel plates', Proc. of 5th Int. Conf. on Civil Engineering, Mashhad, Iran, 139-146(In Persian)
9 Priestley, M.J.N., Seible, E, Verma, R. and Xiao, Y. (1994a), 'Steel jacket retrofitting of reinforced concrete bridge columns for enhanced shear strength - Part 1: Theoretical considerations and test design', ACI Struct. J.,91(4),394-405
10 Priestley, M.J.N., Seible, F., Verma, R. and Xiao, Y. (1994b), 'Steel jacket retrofitting of reinforced concrete bridge columns for enhanced shear strength - Part 2: Test results and comparison with theory', ACI Struct. J., 91(5), 537-551
11 Priestley, M.J.N., Verma, R. and Xiao, Y. (1994c), 'Seismic shear strength of reinforced concrete columns', J. Struct. Eng., ASCE, 120(8), 2310-2329   DOI   ScienceOn
12 Saadatmanesh, H., Ehsani, M.R. and Jin, L. (1997), 'Seismic retrofitting of rectangular bridge columns with composite straps', Earthquake Spectra, 13(2), 281-304   DOI   ScienceOn
13 Sheikh, S.A. and Yau, G. (2002), 'Seismic behavior of concrete columns confined with steel and fiber-reinforced polymers', ACI Struct. J., 99(1), 72-80
14 Takiguchi, K. and Abdullah (2001), 'Shear strengthening of reinforced concrete columns using ferrocement jacket', ACI Struct. J., 98(5), 696-704
15 Tumialan, G, Nakano, K., Fukuyama, H. and Nanni, A. (2001), 'Japanese and North American guidelines for strengthening concrete structures with FRP: A comparative review of shear provisions', Non-Metallic Reinforcement for Concrete Structures - FRPRCS-5, Cambridge
16 Wipf, T.J., Klaiber, EW. and Russo, F.M. (1997), 'Evaluation of seismic retrofit methods for reinforced concrete bridge columns', Technical Report NCEER-97-0016, NCEER, New York
17 Xiao, Y., Wu, H. and Martin, G.R. (1999), 'Prefabricated composite jacketing of R/C columns for enhanced shear strength', J. Struct. Eng., ASCE, 125(3), 255-264   DOI   ScienceOn