Crack stop holes in steel bridge decks: Drilling method and effects

Force analysis using a compact tension model, as recommended by ASTM, was carried out on a crack stop hole. The stress before, and after, drilling the hole was compared in terms of stress concentration and stress gradient. The optimum drilling location and diameter were studied through analysis of different locations and diameters. By analyzing the effects of flank holes and an additional hole, drilling advice was proposed and fatigue testing of the cracks in a steel bridge deck with a crack stop hole was conducted. The results show that the stress at the crack tip with a crack stop hole decreased, and the major principal stress around the hole was distributed accordingly. The optimum position of the crack stop hole centre was where the centre of the crack stop hole was situated behind the crack and the hole edge coincided with the crack tip. Therefore, hole diameters larger than 8 mm, or those weakening the section by 10%, were suggested as the best diameters. In terms of multi-hole crack stopping, a flank hole was not recommended. The optimum horizontal position of flank holes was at a distance of 1/4 of a single hole diameter from, and in front of, the single hole. Besides, the experiment showed that crack stop hole could only prevent cracks from growing and had no influence on crack growth rate.

[1]  John W. Fisher,et al.  Results of Field Measurements on the Williamsburg Bridge Orthotropic Deck, Final Report on Phase III , 2001 .

[2]  Chow-Shing Shin,et al.  Fatigue damage repair: a comparison of some possible methods , 1996 .

[3]  P. S. Song,et al.  Stop drilling procedure for fatigue life improvement , 2004 .

[4]  Majid R. Ayatollahi,et al.  A numerical study on the effect of symmetric crack flank holes on fatigue life extension of a SENT specimen , 2014 .

[5]  Ryouji Kondou,et al.  A New Proposal for Retarding Fatigue Crack Reinitiation and Growth from Crack-Tip Introduced Stop-Drilled Hole by Providing Additional Holes , 2007 .

[6]  Anggit Murdani,et al.  Crack-growth arrest by redirecting crack growth by drilling stop holes and inserting pins into them , 2009 .

[7]  Anggit Murdani,et al.  Stress concentration at stop-drilled holes and additional holes , 2008 .

[8]  Anggit Murdani,et al.  A crack-growth arresting technique in aluminum alloy , 2008 .

[9]  Chobin Makabe,et al.  Method of arresting crack growth for application at a narrow working space , 2014 .

[10]  M. Fanni,et al.  New crack stop hole shape using structural optimizing technique , 2015 .

[11]  J. Choi,et al.  Stress Characteristics and Fatigue Crack Behaviour of the Longitudinal Rib-To-Cross Beam Joints in an Orthotropic Steel Deck , 2008 .

[12]  Q. Pan,et al.  Fracture toughness and fatigue crack growth analysis of 7050-T7451 alloy thick plate with different thicknesses , 2014 .

[13]  Majid R. Ayatollahi,et al.  Fatigue Life Extension by Crack Repair Using Stop-hole Technique under Pure Mode-I and Pure mode-II Loading Conditions , 2014 .

[14]  J. W. Fisher,et al.  Fatigue of steel bridge infrastructure , 2011 .

[15]  Kentaro Yamada,et al.  Fatigue Evaluation of Rib-to-Deck Welded Joints of Orthotropic Steel Bridge Deck , 2011 .

[16]  Majid R. Ayatollahi,et al.  Mixed mode fatigue crack initiation and growth in a CT specimen repaired by stop hole technique , 2015 .

[17]  Caroline Bennett,et al.  Development of a Technique to Improve Fatigue Lives of Crack-Stop Holes in Steel Bridges , 2010 .

[18]  Marco Antonio Meggiolaro,et al.  On the prediction of the residual fatigue life of cracked structures repaired by the stop-hole method , 2010 .