PSI - Issue 63

Jiří Brožovský et al. / Procedia Structural Integrity 63 (2024) 1– 6

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Fig. 4. FEA model of the tension flange under analysis. The analysis was based on comparison of the � with other normal stresses ( � , � ). The figures in this paper show selected stresses and their ranges. As it is illustrated in the pictures the � stresses in the studied area are in the range of 10 6 while the stresses � were up to 10 3 (the � stresses were smaller than � ). It should be mentioned that the scale of the Figures does not allow such detailed analysis and the � , � stress values were obtained from textual output of the software. As the initial requirement defined for this analysis was that the � , � stresses should not be higher than 10% of the � stress in can be concluded that the assumption that and stresses can be omitted in simplified (analytical) calculations was assessed as the valid one. 5. Conclusion The paper discussed an engineer-level approach to solving complex problems associated with the reliability of steel concrete bridge structures and focused on fatigue resistance and the corresponding stress-strain state described by a developed numerical FEM model. Necessary steps were discussed and some of challenges and possible ways how so overcome them have been presented. Due to the fact that in the analyzed detail the stresses arising mainly in one axis of the (longitudinal) bridge structure was determined, it can be stated that the assumptions for fatigue damage prediction modeling based on the uniaxial state of tension are applicable. The procedure is going to be further improved and used for preparation of models for theoretical fatigue studies at micro - and, possibly, nano - scales. Due to the computational complexity of these numerical analyses, the use of powerful computing technology with multi-core systems and supercomputers is also assumed. Acknowledgements The research was supported by Czech Science Foundation Grant No. 21-14886S (Influence of material properties of high strength steels on durability of engineering structures and bridges). This work was also supported by the Ministry of Education, Youth and Sports of the Czech Republic through the e-INFRA CZ (ID:90254).