Investigation of Distortion-Induced Web-Gap Cracking in a Seismically Retrofitted Steel Bridge: Repair Measures

AbstractThis paper studies distortion-induced fatigue cracks in a 1960s-era welded plate girder bridge that developed cracks in the web-gap region shortly after completion of a comprehensive seismic retrofit. Finite-element analysis (FEA) and field testing were conducted to investigate the cause of cracking and then to recommend appropriate repair measures for the bridge. The field test results validated the high-stress concentrations in the web-gap region of the bridge that led to fatigue cracking after only a limited number of cycles. FEA results indicated that the high-stress concentrations were principally a result of replacing K-type diaphragms with stiffer cross diaphragms as part of the seismic retrofit. Two conventional repair measures in addition to two innovative repair measures were evaluated. The proposed innovative repair measures focused on ease of installation compared with more conventional options and were found to reduce the distortion-induced stresses well below the constant amplitude f...

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

[2]  W. Phillip Yen,et al.  FHWA Bridge Seismic Retrofit Manual and Its Applications in Missouri Highway Bridges , 2001 .

[3]  Yuan Zhao,et al.  Fatigue Behavior and Retrofit Investigation of Distortion-Induced Web Gap Cracking , 2007 .

[4]  John W. Fisher,et al.  Identifying Effective and Ineffective Retrofits for Distortion Fatigue Cracking in Steel Bridges Using Field Instrumentation , 2006 .

[5]  Amanda Hartman.  Analytical and Experimental Investigation for Distortion-Induced Fatigue in Steel Bridges , 2013 .

[6]  Mark R. Capron,et al.  Seismic Retrofit of the US-40/I-64 Double-Deck Approach to Poplar Street Bridge in St. Louis , 2001 .

[7]  A. Hobbacher.  Recommendations for fatigue design of welded joints and components , 2016 .

[8]  Arturo E. Schultz,et al.  Measurement and analysis of distortion-induced fatigue in multigirder steel bridges , 2003 .

[9]  Caroline Bennett,et al.  Effects of Cross-Frame Placement and Skew on Distortion-Induced Fatigue in Steel Bridges , 2010 .

[10]  Erkki Niemi,et al.  Stress determination for fatigue analysis of welded components , 1995 .

[11]  Fouad Fanous,et al.  Field Testing and Finite-Element Analysis of Steel Bridge Retrofits for Distortion-Induced Fatigue , 2006 .

[12]  John W. Fisher,et al.  Distortion-induced fatigue cracking of bridge details with web gaps , 1989 .

[13]  Yuan Zhao,et al.  Fatigue crack investigation for the Arkansas River Bridge in Hutchinson, Kansas , 2000 .

[14]  Terry J Wipf,et al.  RETROFIT SOLUTION FOR OUT-OF-PLANE DISTORTION OF X-TYPE DIAPHRAGM BRIDGES , 1998 .

[15]  John Finke.  Construction of Seismic Retrofit Strategies of the US 40/I-64 Double Deck Bridge Complex , 2006 .

[16]  J. Fisher,et al.  FATIGUE AND FRACTURE IN STEEL BRIDGES , 1984 .