Full-Range S-N Fatigue-Life Evaluation Method for Welded Bridge Structures Considering Hot-Spot and Welding Residual Stress

AbstractFatigue cracking is crucial issue for welded steel bridges that endure repeated vehicle loads. With typical fatigue-life evaluation methods, it is difficult to consider the influence of low stress amplitude. Based on existing full-range S-N curves and their formulas for base metal, a unified fatigue-life evaluation method is recommended for welded joints. The basis for construction of full-range S-N curves is to obtain the welding residual stress and stress concentration factor. In this paper, rib-to-deck welded joints are introduced as examples to demonstrate the detailed steps of a fatigue-life evaluation procedure. From the analysis of welding residual stress, it can be concluded that residual stress is influenced by the geometric dimensions of the composite members. With an increase in the geometric dimensions, the level of residual stress is increased. In addition, static-load experiments were conducted to obtain the stress concentration factor. A hot-spot full-range S-N curve was then obtain...

[1]  Henning Agerskov,et al.  Fatigue in Steel Highway Bridges under Random Loading , 2000 .

[2]  Y. Song,et al.  Fatigue monitoring and analysis of orthotropic steel deck considering traffic volume and ambient temperature , 2013 .

[3]  Dan M. Frangopol,et al.  Bridge Reliability Assessment Based on Monitoring , 2008 .

[4]  Tong Guo,et al.  Field stress/displacement monitoring and fatigue reliability assessment of retrofitted steel bridge details , 2011 .

[5]  John T. DeWolf,et al.  Development and Implementation of a Continuous Strain Monitoring System on a Multi-Girder Composite Steel Bridge , 2006 .

[6]  Christian Cremona,et al.  Improved Assessment Methods for Static and Fatigue Resistance of Old Metallic Railway Bridges , 2007 .

[7]  Satoshi Nishijima.  Basic Fatigue Properties of JIS Steels for Machine Structural Use NRIM Special Report(Technical Report)No.93-02 , 1993 .

[8]  Tong Guo,et al.  Influence of ambient temperature on the fatigue damage of welded bridge decks , 2008 .

[9]  Jin Jiang,et al.  Residual stress study of welded high strength steel thin-walled plate-to-plate joints, part 2 : numerical modeling , 2012 .

[10]  Tong Guo,et al.  Analysis and assessment of bridge health monitoring mass data—progress in research/development of “Structural Health Monitoring” , 2012 .

[11]  Z. X. Li,et al.  Combined use of SHMS and finite element strain data for assessing the fatigue reliability index of girder components in long-span cable-stayed bridge , 2010 .

[12]  J. Kohout,et al.  A new function for fatigue curves characterization and its multiple merits , 2001 .

[13]  Udo Peil.  Assessment of bridges via monitoring , 2005 .

[14]  D. Radaj,et al.  Review of fatigue strength assessment of nonwelded and welded structures based on local parameters , 1996 .

[15]  Yi-Qing Ni,et al.  Statistical analysis of stress spectra for fatigue life assessment of steel bridges with structural health monitoring data , 2012 .

[16]  Ranjith Dissanayake,et al.  Developing a full range S–N curve and estimating cumulative fatigue damage of steel elements , 2015 .

[17]  John W. Fisher.  Fatigue and Fracture in Steel Bridges: Case Studies , 1984 .

[18]  Abdelwaheb Amrouche,et al.  Sequential law in multiaxial fatigue, a new damage indicator , 2005 .

[19]  Kai Liu,et al.  Fatigue assessment of a composite railway bridge for high speed trains. Part I: Modeling and fatigue critical details , 2013 .

[20]  G. De Roeck,et al.  Fatigue assessment of a composite railway bridge for high speed trains. Part II: Conditions for which a dynamic analysis is needed , 2013 .