چکیده مقاله
Fatigue life of tubular joints in offshore structures is not only dependent on the value of hotspot stress, but is also significantly influenced by the through the thickness stress distribution characterized by the degree of bending DoB The DoB exhibits considerable scatter calling for greater emphasis in accurate determination of its governing probability distribution which is a crucial input for the fatigue reliability analysis of a tubular joint Although the tubular Kjoints are commonly found in offshore jacket structures, as far as the authors are aware, no comprehensive research has been carried out on the probability distribution of DoBs in tubular K joints What has been used so far as the probability distribution of DoBs in reliability analyses is mainly based on assumptions and limited observations, especially in terms of distribution parameters In the present paper, results of parametric equations available for the calculation of DoBs have been used to develop probability distribution models for DoBs in axially loaded tubular K joints Based on a parametric study, a set of samples was prepared and density histograms were generated for these samples using Freedman Diaconis method Ten different probability density functions were fitted to these histograms The maximum likelihood method was utilized to determine the parameters of fitted distributions In each case, Kolmogorov Smirnov test was used to evaluate the goodness of fit It was concluded that generalized extreme value, gamma, log logistic, and Birnbaum Saunders distributions are the best probability models for DoBch, DoBch0, DoBch45, and DoBch180 in axially loaded tubular Kjoints, respectively
کلیدواژهها
نویسندگان
حمید احمدی
Faculty of Civil Engineering, University of Tabriz, Tabriz ۵۱۶۶۶۱۶۴۷۱, Iran
Amirreza Ghaffari
Faculty of Civil Engineering, University of Tabriz, Tabriz ۵۱۶۶۶۱۶۴۷۱, Iran
شیوه ارجاع
Ahmadi, Hamid and Ghaffari, Amirreza,1394,Deriving probability density functions for degree of bending (DoB) in axially loaded tubular K-joints,10th International Congress on Civil Engineering,Tabriz
ارائهشده در
مجموعه مقالات دهمین کنگره بین المللی مهندسی عمران15 اردیبهشت 1394 · تبریز