FORMATS OF THE METHOD OF RELIABILITY FACTORS IN THE DESIGN OF REINFORCED CONCRETE STRUCTURES BASED ON COMPUTER MODELS
DOI:
https://doi.org/10.36773/1818-1112-2024-134-2-34-40Keywords:
safety format, nonlinear load-bearing capacity models, finite element method, reinforced concrete structures, probabilistic method, reliability factors, uncertainties, EurocodeAbstract
In international regulatory documents, there are requirements related to the nonlinear finite element analysis of structures and structural systems, and most
importantly to ensuring the required safety format when performing such an analysis. The introduction of requirements related to the nonlinear analysis of
structures into regulatory documents is due both to the increased interest in this problem during the transition to new design methods, and new opportunities due
to the development of computer technology and software at various levels, which creates opportunities for such design. Considering that this direction is new and
not formed, which causes a number of terminological and methodological inconsistencies in the scientific literature, this article critically analyzes approaches to ensuring the required safety format when performing nonlinear analysis (without focusing on the implementation of the nonlinear resistance model proper) included in the draft regulatory documents prEN1990 and prEN1992. Based on an analytical review of the research, a description and critical analysis of the safety formats of reinforced concrete structures designed on the basis of nonlinear finite element models are presented. The safety formats are systematized depending (i) on how the uncertainty of the basic variables is taken into account, (ii) on how the variability of the basic
variables and model uncertainty are introduced, (iii) on whether the values of the partial factors are fixed or adjustable. Two main tasks have been formed that
restrain the use of nonlinear finite element models in everyday design. The first is related to the methods of estimating the coefficient of variation of the loadbearing
capacity. The second is related to the absence or lack of knowledge of the statistical parameters of the uncertainty of finite element models.
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