Confinement strengthening of heat-damaged reinforced concrete columns

The effectiveness of different strengthening techniques in restoring heat-damaged concrete short columns was evaluated experimentally. Four confinement strengthening systems were employed: high-strength fibre-reinforced concrete (HSFRC), ferrocement (FC), glass-fibre-reinforced polymer (GFRP) and steel plate (SP) jacketing. Fifty-one reinforced concrete prisms of size 150 × 150 × 450 mm were first subjected to different elevated temperatures. Heated specimens were strengthened using one of the chosen techniques. Thereafter, all specimens were tested under monotonic loading to determine the axial ultimate strength, stiffness, ductility, energy absorption and peak stress–strain behaviour. It was observed that the GFRP jacketing was effective in restoring the compressive strength and energy dissipation, but was not capable of restoring the stiffness. However, FC and HSFRC jacketing were effective mainly in restoring the stiffness of heat-damaged concrete. SP jacketing was not effective in improving the stren...

[1]  Hamid Saadatmanesh,et al.  STRENGTH AND DUCTILITY OF CONCRETE COLUMNS EXTERNALLY REINFORCED WITH FIBER COMPOSITE STRAPS , 1994 .

[2]  Abdullah,et al.  An investigation into the behavior and strength of reinforced concrete columns strengthened with ferrocement jackets , 2003 .

[3]  A. Meda,et al.  Strengthening and repair of RC beams with fiber reinforced concrete , 2010 .

[4]  Paul Nedwell,et al.  Strength and stiffness of post-heated columns repaired with ferrocement and fibre reinforced polymer jackets , 2013 .

[5]  G. Mohamedbhai.  Effect of exposure time and rates of heating and cooling on residual strength of heated concrete , 1986 .

[6]  Colin Bailey,et al.  Cross sectional shape effects on the performance of post-heated reinforced concrete columns wrapped with FRP composites , 2011 .

[7]  Yousef A. Al-Salloum,et al.  Behavior of FRP-confined concrete after high temperature exposure , 2011 .

[8]  R. Haddad,et al.  Effect of elevated temperature on bond between steel reinforcement and fiber reinforced concrete , 2008 .

[9]  Hiroshi Mutsuyoshi,et al.  Shear strengthening of RC beams with web-bonded continuous steel plates , 2006 .

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

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

[12]  P. Rathish Kumar,et al.  Constitutive behaviour of high-performance ferrocement under axial compression , 2006 .

[13]  Rami H. Haddad,et al.  Repair of heat-damaged reinforced concrete slabs using fibrous composite materials , 2011 .

[14]  J. Teng,et al.  Design-oriented stress–strain model for FRP-confined concrete , 2003 .

[15]  Rami H. Haddad,et al.  Repair of heat-damaged RC shallow beams using advanced composites , 2008 .

[16]  Rami H. Haddad,et al.  Repair of heat-damaged reinforced concrete T-beams using FRC jackets , 2007 .

[17]  Omar Chaallal,et al.  Performance of Axially Loaded Short Rectangular Columns Strengthened with Carbon Fiber-Reinforced Polymer Wrapping , 2003 .

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

[19]  Ezzat H. Fahmy,et al.  Repairing reinforced concrete columns using ferrocement laminates , 1999 .

[20]  Y. Al-Salloum.  Influence of edge sharpness on the strength of square concrete columns confined with FRP composite laminates , 2007 .

[21]  J M Barcena,et al.  Efficiency of short steel jackets for strengthening square section concrete columns , 1997 .

[22]  N. M. Bhandari,et al.  Effect of temperature on uni-axial compressive behavior of confined concrete , 2012 .

[23]  A. Ghobarah,et al.  Retrofit of RC square short columns , 2005 .

[24]  Mehmet Burhan Karakoç,et al.  Effect of cooling regimes on compressive strength of concrete with lightweight aggregate exposed to high temperature , 2013 .

[25]  Mark F. Green,et al.  Fire insulation schemes for FRP-strengthened concrete slabs , 2006 .

[26]  Luke Bisby,et al.  Strengthening fire-damaged concrete by confinement with fibre-reinforced polymer wraps , 2011 .

[27]  R. Vaidyanathan,et al.  Behaviour of reinforced concrete rectangular columns strengthened using GFRP , 2007 .

[28]  Colin Bailey,et al.  Repair of fire damaged circular reinforced concrete columns with FRP composites , 2011 .

[29]  Paul Nedwell,et al.  Axial capacity of post-heated square columns wrapped with FRP composites , 2011 .

[30]  M. Shannag,et al.  Repair and strengthening of reinforced concrete square columns using ferrocement jackets , 2012 .

[31]  B. Kondraivendhan,et al.  Effect of ferrocement confinement on behavior of concrete , 2009 .