Issue 59

N. Kouider et alii, Frattura ed Integrità Strutturale, 59 (2022) 153-171; DOI: 10.3221/IGF-ESIS.59.12

Figure 1: Design of I-beams with normal web.

Figure 2: Triangular web.

Figure 3: Trapezoidal web. The cross sections of the profiles can be classified according to their ability to reach their limit state. This classification is influenced by the ability of sections to plasticize and the influence of instabilities. The Eurocode defines four types of classes. Gatheeshgar and al [13] describe the calculation of the effective properties of section I with flanged edges in the upper and lower flange in more detail. The properties of effective cross-sections in class 4 are based on the effective widths of the compression parts. To understand the phenomenon of instability of cold-formed elements, we have recourse to calculation codes, the most widely used, namely the European code (Eurocode), in the design philosophy of this type of profile is based on the principle of the effective width. This principle currently forms the basis of most of the calculation codes for cold-formed thin sections.

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