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2 Bulletin of the Polish Academy of Sciences. Technical Sciences

2 2025

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Bending behaviour of thin-walled perforated channel beams with modified cross-sectional shape – Part 1: experimental tests and FSM

Paczos Piotr, Pawlak Aleksandra m., Jasion Paweł, Plust Michał

Bulletin of the Polish Academy of Sciences. Technical Sciences

2025

Vol. 73, nr 3

art. no. e153830

The subject of this study is thin-walled channel sections with a modified cross-sectional shape. The investigation involved six beams, three of which had perforations on the web, while the other three had a flat, solid web. The beams were subjected to four-point bending tests. Experimental tests were conducted using both electronic and optical methods, with a test setup specifically designed for this investigation. Additionally, numerical analyses were performed using the finite strip method. The primary objective of the research was to determine the impact of web perforations on the strength and stability of the bent beams. The perforation of the web also resulted in a reduction in the overall weight of the structure, thereby decreasing material consumption. Based on the research, the critical forces and maximum forces at which total loss of load-bearing capacity occurred were determined. Furthermore, the buckling modes of the beams were identified. The study revealed that the critical and maximum forces for beams with perforated webs were lower compared to beams with a flat, solid web. However, the significant reduction in weight for the perforated beams suggests that their use remains advantageous. The results of FEM and analytical analyses, essential for modelling and understanding complex behaviours in thin-walled structures, will be presented in the second part of this publication to maintain clarity and accessibility.

Bending behaviour of thin-walled perforated channel beams with modified cross sectional shape – Part 2: analytical calculations and FEM

Jasion Paweł, Pawlak Aleksandra Magdalena, Paczos Piotr, Plust Michał, Rodak Marcin

Bulletin of the Polish Academy of Sciences. Technical Sciences

2025

Vol. 73, nr 4

art. no. e153435

This article is the second part of a comprehensive research program investigating the structural performance of thin-walled channels with modified cross-sectional geometries. The study involved testing six beams, three of which featured perforated webs, while the other three had flat, solid webs. The beams were subjected to four-point bending tests in order to evaluate their load-bearing capacity. The first part of the research presented the results of experimental tests and finite strip analysis. This article will focus on finite element analyses and analytical calculations conducted in accordance with Eurocode 3 guidelines and the principle of minimizing potential energy. The study provides several significant contributions: it integrates experimental, numerical and theoretical methods to deliver a thorough evaluation of beam performance. The finite element method (FEM) simulations offer precise modeling of complex stress and strain states, while analytical calculations supply a solid theoretical foundation for interpreting structural behavior. The research demonstrates that web perforation, while reducing critical and maximum forces, also results in considerable weight savings, enhancing material efficiency. Additionally, the division of the research into two articles ensures clarity and accessibility, with this second part being dedicated to detailed FEM and analytical results, thereby facilitating both academic understanding and practical engineering applications.