Reliability of built-up cold-formed steel beams designed by the direct strength method

Autores

  • Marcelo Borges Pereira UFOP - Universidade Federal de Ouro Preto
  • André Luís Riqueira Brandão Institute of Integrated Engineering, Federal University of Itajubá
  • Marcilio Sousa da Rocha Freitas Civil Engineering Program, Federal University of Ouro Preto

DOI:

https://doi.org/10.55592/cilamce.v6i06.10431

Palavras-chave:

Built-up beams, Reliability, Cold-formed steel

Resumo

Built-up cold-formed steel (CFS) beams are composed of two or more sections that are joined together with welds, bolts or screws. Although PFF composite bars are commonly used in bending applications, the structural design of these sections requires further investigation. This study proposed a critical review of research related to the structural behavior and designing methodology of these elements. A review of published articles, encompassing experimental studies and numerical simulations of these elements, was conducted. The safety of built-up beams subjected to bending, designed according to the Direct Strength Method (AISI S100, 2016; NBR 14762, 2010), was evaluated and for the statistical study of the model error variable, beam test results obtained from literature were compared to the resistant capacities obtained by the direct strength method (DSM). The structural safety verification of built-up beams was performed using first-order reliability methods to assess the safety level for different load combinations. A calibration procedure for NBR 14762 (2010) was also presented, obtaining the resistance factor for a target reliability index.

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Publicado

2024-12-02

Edição

Seção

Structural Reliability Methods and Design Optimization Under Uncertainties