Issue 59

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

Eurocode3

ABAQUS

0 10 20 30 40 50 60 70 80

Beam with normal web

Beam with trapezoidal web

Beam with triangular web

Figure 18: Comparison of beams moment state according to ABAQUS and Eurocode 3.

For a load of 6 kN, Fig. 18 shows a very good correlation between numerical results and those proposed by Eurocode 3 part 1-3, a difference less than 13%. The numerical results confirm that the triangular corrugated web beam has a maximum moment capacity compared to all models, which is 25% higher than the ordinary web. The trapezoidal core configuration has greater strength compared to the triangular and ordinary core configuration. Eurocode 3 gives a more unfavorable state of moment compared to other models because Eurocode is based on experimentation, which is why some failures can be found. Therefore, the corrugated steel beam is economical in all respects [27]. The beam whose web is trapezoidal corrugated has greater moment resistance and greater rigidity compared to the single-web beam. This displacement ductility can influence the increase in stiffness of the corrugated web [26].

C ONCLUSIONS

T

he numerical study and the theoretical approach on section I beams with different web shapes allowed us to draw the following conclusions: • Tried metal beams are made of relatively thin parts and with significant slenderness. They are particularly sensitive to the phenomena of instability. The single web beam exhibited a significant lateral displacement compared to the corrugated web beams (triangular and trapezoidal) and a local buckling, this lateral displacement results in instability i.e a distortional lateral buckling. • The beam with trapezoidal web showed a failure in the upper flange of the central zone which is defined by local buckling. • The beam with the triangular web exhibited a significant torsional lateral displacement in the central zone. • Analysis shows that an I-beam with a corrugated web will twist out of the plane at the same time as it deforms in the plane under the action of loads in the plane. • By increasing the load, and in the midpoint of the bottom flange. It can be seen that the beams with corrugated webs (trapezoidal and triangular) showed a reduction in displacement y U of the order of 84% and 31% respectively. • The trapezoidal corrugated web presented a maximum capacity compared to the beam model with regular and triangular web: - A decrease of 21% in x U displacement point of view. - A 36% decrease in y U displacement point of view. • Corrugated web beams are advantageous for the construction industry due to their maximum lateral stiffness. • Corrugation improves the bending capacity and the beam stiffness, especially for trapezoidal web beams. • The load capacity is higher for beams with corrugated webs compared to beams with a normal web. • The European Eurocode 3 regulation is effective for dedicating to the sizing and design of thin cold formed beams.

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