Experimental Evaluation of Axial Behavior of Strengthened Circular Reinforced-Concrete Columns

Insufficient or deteriorating reinforced-concrete piers in many existing bridges are required to be strengthened using economical, fast, and efficient methods. Currently, only a few methods can be used to strengthen circular columns. Steel jackets and fiber-reinforced polymer (FRP) composites are the two commonly used methods. In this study, along with these two strengthening methods, concrete jackets reinforced with spiral rebar, welded wire fabric (WWF), and a new steel reinforcement called PCS are investigated under different axial-load applications. Fifteen identical specimens were constructed, strengthened, and tested: one column with no strengthening; three columns strengthened with FRP; two with steel jacketing; and nine with concrete jacketing (two with WWF, three with spiral rebar, and four with the new reinforcement). The bare or unretrofitted specimens had a 152 mm (6 in.) diameter, while the outside diameter of concrete-jacketed specimens was 254 mm (10 in.). Effectiveness of each strengthenin...

[1]  Y. C. Kog,et al.  Jacketing of reinforced concrete columns subjected to axial load , 2004 .

[2]  Alessandra Marini,et al.  Retrofitting of R/C shear walls by means of high performance jackets , 2009 .

[3]  Yan Xiao,et al.  Steel Jacket Retrofitting of Reinforced Concrete BridgeColumns for Enhanced Shear Strength-Part 1: TheoreticalConsiderations and Test Design , 1994 .

[4]  Michael E. Kreger,et al.  Rehabilitation of shear critical concrete columns by use of rectangular steel jackets , 1999 .

[5]  H. Sezen,et al.  High-Strength Concrete Columns Reinforced with Prefabricated Cage System , 2008 .

[6]  Frieder Seible,et al.  Steel Jacket Retrofitting of Reinforced Concrete Bridge Columns for Enhanced Shear Strength--Part 2: Test Results and Comparison With Theory , 1994 .

[7]  A T Tankut,et al.  Behavior of Jacketed Columns , 1993 .

[8]  Halil Sezen,et al.  Economic Evaluation of Reinforced Concrete Structures with Columns Reinforced with Prefabricated Cage System , 2007 .

[9]  Shamim A. Sheikh,et al.  Investigation of glass-fibre-reinforced-polymer shells as formwork and reinforcement for concrete columns , 2007 .

[10]  Luc Taerwe,et al.  Stress–Strain Behavior of Large-Scale Circular Columns Confined with FRP Composites , 2006 .

[11]  James O. Jirsa,et al.  LATERAL LOAD RESPONSE OF STRENGTHENED AND REPAIRED REINFORCED CONCRETE COLUMNS , 1988 .

[12]  H. Saadatmanesh,et al.  REPAIR OF EARTHQUAKE-DAMAGED RC COLUMNS WITH FRP WRAPS , 1997 .

[13]  Peter Gillespie.  Reinforced Concrete Columns , 1910 .

[14]  Shamim A. Sheikh.  Field and laboratory performance of bridge columns repaired with wrapped glass-fibre-reinforced-polymer sheets , 2007 .

[15]  M. Fardis,et al.  Strength, Stiffness, and Cyclic Deformation Capacity of Concrete Jacketed Members , 2007 .

[16]  Vincenzo Piluso,et al.  REINFORCED CONCRETE COLUMNS STRENGTHENED WITH ANGLES AND BATTENS SUBJECTED TO ECCENTRIC LOAD , 2009 .

[17]  R. Park,et al.  Seismic Load Tests on Reinforced Concrete Columns Strengthened by Jacketing , 1994 .

[18]  Yan Xiao,et al.  RETROFIT OF REINFORCED CONCRETE COLUMNS USING PARTIALLY STIFFENED STEEL JACKETS , 2003 .

[19]  Yi Zhang,et al.  Analytical Evaluation of Retrofit Strategies for Multicolumn Bridges , 1999 .

[20]  Richard Sause,et al.  Axial Behavior of Reinforced Concrete Columns Confined with FRP Jackets , 2001 .

[21]  Huei-Jeng Lin,et al.  Compressive strength of reinforced concrete column confined by composite material , 2004 .

[22]  Cem Demir,et al.  FRP Retrofit of Low and Medium Strength Circular and Rectangular Reinforced Concrete Columns , 2008 .