Reliability-based fatigue assessment of steel bridges using LEFM – A sensitivity analysis

Effect of shape factor on structural reliability analysis of a surface cracked pipeline-parametric study

“…5, where β for shape ratio a/c = 0.5 is less than β for a/c = 1, so the first case reach the target reliability index before the second. Also, these results seems to be in difference with those in [11] where the authors fixed the aspect ratio for all fatigue life. He found that semicircular crack had a shorter life time then shallow crack.…”

“…Fatigue life calculation shows that variation of crack shape factor can influence reliability index estimation. Initial shallow crack was revealed to have shorter life time then initial semicircular crack differently from results in [11]. Finally, an accurate correlation between a/t and a/c can give more precision in service life estimation of cracked pipeline.…”

“…Stress intensity factor is estimated with less accuracy. The authors in [11] made the rest of his calculations with constant shape factor a/c=0.62 following recommendations in [18] in order to not shadow the influence of others parameters of study.…”

“…In probabilistic fatigue calculation many authors take into consideration crack growth in depth direction only for simplification purpose [9] or assume basic Paris crack growth in depth and surface direction where crack growth rates are equal : Ca=Cc [10]. Leander and Al-Emrani [11] published reliability fatigue assessment of steel bridge. They illustrated the effect of initial crack aspect ratio on fatigue lifetime.…”

Fatigue reliability assessment of steel bridges considering spatial correlation in system evaluation

“…However, King, Stacey, and Sharp (1996) presented a review of existing data on fatigue crack growth rates in structural and engineering steel and proposed bi-linear constants that offers improved accuracy. The bi-linear crack growth rate relation has also been suggested in BSI (2013) and JCSS ( 2001) for its good performance and has been applied in many fatigue analysis of bridges (Righiniotis and Chryssanthopoulos ( 2004), Kwon, Frangopol, and Soliman (2012), Maljaars, Steenbergen, and Vrouwenvelder (2012), Maljaars and Vrouwenvelder (2014), Leander and Al-Emrani (2016)). It is expressed as:…”