Using DOProC method in reliability assessment of steel elements exposed to fatigue

Abstract

Abstract. Fatigue crack damage depends on a number of stress range cycles. This is a time factor in the course of reliability for the entire designed service life. Three sizes are important for the characteristics of the propagation of fatigue cracks -initial size, detectable size and acceptable size. The theoretical model of fatigue crack progression can be based on a linear fracture mechanic. Depending on location of an initial crack, the crack may propagate in structural element e.g. from the edge or from the surface. When determining the required degree of reliability, it is possible to specify the time of the first inspection of the construction which will focus on the fatigue damage. Using a conditional probability and Bayesian approach, times for subsequent inspections can be determined. For probabilistic modelling of fatigue crack progression was used the original and new probabilistic method -the Direct Optimized Probabilistic Calculation ("DOProC"), which uses a purely numerical approach without any simulation techniques or approximation approach based on optimized numerical integration.

The influence of the coefficient of variation on the process reliability of brick production

“…In particular, data are presented on the relationship between cost (as the main factor influencing decision-making) and the reliability of the building structures investigated solutions, taking into account the impact on the environment [5][6][7]. Modeling methods that allow characterizing the uncertainty with a wide range of assumptions of dependences [8][9][10] have been developed, the analysis of the effect of partial safety factors on the reliability of design of steel elements [11] has been conducted Statistical methods allow to get at the design stage an idea of the reinforced concrete structures reliability under conditions of various beyond design impacts such as fire, formation and progressive development of fatigue cracks [12,13]. At the same time, the theory of building structures reliability has a unified scientific justification, but the disadvantage of this justification is that the most important concept formulations do not contain the terms of structural mechanics, which can lead to in-accuracies in calculations and design [14][15][16].…”

Experimental and Numerical Evaluation of Clinch Connections of Thin-Walled Building Structures

“…Existing publications have analysed problems of numerical modelling of structures based on thin-walled sections [17,18], steel bearing elements [19], or reinforced concrete structures [20], while the problem of the modelling of the clinch connection has not yet been thoroughly explored. The results of the tests can lead to the calibration and validation of the mathematical models [8,21,22], which should ensure the conformity of the numerical model and the actual behaviour of the studied structures [23].…”