Fatigue Tests of Cracked Steel Plates Strengthened with UHM CFRP Plates

Carbon fibre reinforced polymer (CFRP) has shown promise for improving the fatigue performance of steel structures. Previous studies have indicated that increasing the Young's modulus of CFRP can be beneficial for decreasing the stress intensity factor at the fatigue crack tip. In this project, ultra high modulus (UHM) CFRP plates with Young's modulus of 460 GPa were adopted to study their fatigue repair effectiveness. A series of fatigue tension tests was carried out on steel plates with an initial crack in the centre. Five strengthening configurations were used and a constant amplitude fatigue loading was applied to all the specimens. The beach marking technique was utilized to record the fatigue crack propagation. The effects of CFRP bond length, bond width and bond locations on the fatigue performance of cracked steel plates were also studied. The experimental results show that UHM CFRP plates can greatly increase the fatigue life of cracked steel plates by a factor ranging from 3.26 to 7.47. When CFRP plates cover the whole crack surface, the fatigue crack of the steel plate is arrested. The strengthening effectiveness of UHM CFRP plates is also compared with those using high Young's modulus CFRP sheeting and normal Young's modulus CFRP plates with or without prestressing.

[1]  L. Hart-Smith.  Adhesive-bonded double-lap joints , 2013 .

[2]  W. Duan,et al.  MODE I STRESS INTENSITY FACTOR OF CENTER-CRACKED TENSILE STEEL PLATES WITH CFRP REINFORCEMENT , 2013 .

[3]  W. Duan,et al.  IMPROVED END BEARING CAPACITIES OF SHARP-CORNER ALUMINUM TUBULAR SECTIONS WITH CFRP STRENGTHENING , 2012 .

[4]  T. Ummenhofer,et al.  Fatigue Performance of Tension Steel Plates Strengthened with Prestressed CFRP Laminates , 2010 .

[5]  Riadh Al-Mahaidi,et al.  Boundary element analysis of CFRP reinforced steel plates , 2009 .

[6]  Nicholas G. Tsouvalis,et al.  Experimental and numerical study of the fatigue behaviour of composite patch reinforced cracked steel plates , 2009 .

[7]  R. Al-Mahaidi,et al.  Prediction of fatigue life for CFRP-strengthened steel plates , 2009 .

[8]  Wei Jiang,et al.  Experimental study on repair of fatigue cracks at welded web gusset joint using CFRP strips , 2009 .

[9]  Riadh Al-Mahaidi,et al.  Experimental study of fatigue crack growth behaviour in adhesively reinforced steel structures , 2009 .

[10]  Björn Täljsten,et al.  Strengthening of old metallic structures in fatigue with prestressed and non-prestressed CFRP laminates , 2009 .

[11]  I. M. May,et al.  Modelling composite repairs to cracked metal structures , 2009 .

[12]  Carlo Poggi,et al.  Fatigue performance of tensile steel members strengthened with CFRP plates , 2009 .

[13]  Jin-Guang Teng,et al.  Strengthening and rehabilitation of civil infrastructures using fibre-reinforced polymer (FRP) composites , 2008 .

[14]  Sami H. Rizkalla,et al.  Fatigue and Overloading Behavior of Steel–Concrete Composite Flexural Members Strengthened with High Modulus CFRP Materials , 2007 .

[15]  J. J. Cheng,et al.  Repair of steel structures by bonded carbon fibre reinforced polymer patching: experimental and numerical study of carbon fibre reinforced polymer – steel double-lap joints under tensile loading , 2007 .

[16]  X. Zhao,et al.  State-of-the-art review on FRP strengthened steel structures , 2007 .

[17]  Alan G. Bloodworth,et al.  Strengthening a steel bridge with CFRP composites , 2007 .

[18]  Sami H. Rizkalla,et al.  Repair of damaged aluminum truss joints of highway overhead sign structures using FRP , 2006 .

[19]  S.S.J. Moy,et al.  Strengthening cast iron using FRP composites , 2006 .

[20]  S. Esterby.  American Society for Testing and Materials , 2006 .

[21]  Tim Stratford,et al.  CIRIA report C595 - Strengthening Metallic Structures using Externally-Bonded FRP , 2004 .

[22]  Scott A. Civjan,et al.  APPLICATION OF FIBER REINFORCED POLYMER OVERLAYS TO EXTEND STEEL FATIGUE LIFE , 2003 .

[23]  P. Colombi,et al.  Crack growth induced delamination on steel members reinforced by prestressed composite patch , 2003 .

[24]  Hamid Saadatmanesh,et al.  Fatigue Strength of Steel Girders Strengthened with Carbon Fiber Reinforced Polymer Patch , 2003 .

[25]  A. Machida,et al.  Fiber-Reinforced Polymer Composites for Construction—State-of-the-Art Review , 2002 .

[26]  L C Hollaway,et al.  Progress in the technique of upgrading metallic structures with advanced polymer composites , 2002 .

[27]  Michael J. Chajes,et al.  STRENGTHENING OF A STEEL BRIDGE GIRDER USING CFRP PLATES , 2001 .

[28]  L. C. Hollaway,et al.  Advanced Polymer Composites and Polymers in the Civil Infrastructure , 2001 .

[29]  Željko Domazet,et al.  Comparison of fatigue crack retardation methods , 1996 .

[30]  W. Duan,et al.  Experimental Study on Bond Behaviour between UHM CFRP Laminate and Steel , 2011 .

[31]  T. Stratford.  Strengthening of metallic structures with fibre-reinforced polymer (FRP) composites , 2008 .

[32]  Tensile Properties of Polymer Matrix Composite Materials , 2008 .

[33]  L. Ye,et al.  Experimental Study on Fatigue Behavior of Tensile Steel Plates Strengthened with CFRP Plates , 2006 .

[34]  Tim Stratford,et al.  Strengthening metallic structures using externally bonded fibre-reinforced polymers , 2004 .

[35]  Alain Nussbaumer,et al.  Analysis of cracked steel members reinforced by pre-stress composite patch , 2003 .

[36]  Alain Nussbaumer,et al.  Delamination effects on cracked steel members reinforced by prestressed composite patch , 2003 .

[37]  P. Colombi,et al.  Repair of riveted bridge members damaged by fatigue using CFRP materials , 2000 .

[38]  S. Mall,et al.  Effect of bond thickness on fracture and fatigue strength of adhesively bonded composite joints , 1989 .