Numerical study of the behaviour of transversely corrugated steel arches
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Insinööritieteiden korkeakoulu |
Master's thesis
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en
Pages
80
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Abstract
Transversely corrugated arches of cold-formed steel (CFS) have been used as self-supporting roofing systems due to their simple and cost-efficient methods of manufacturing and erection. However, their complex geometry and doubly corrugated steel sheets, coupled with large manufacturing imperfections, impose significant challenges to the established design methodology in the current Eurocode 3. EC3 Part 1.3 lacks guidelines for the design of CFS arches with transverse corrugations. In this study, the finite element (FE) method was used to further comprehend the failure mechanisms found out in the experimental tests on the effects of transverse corrugations and curvature on CFS arches conducted at Häme University of Applied Sciences. To develop the FE models, the intricate geometries of the arch members were meticulously captured using reversing engineering methods, incorporating 3D optical scanning techniques, and subsequent processing through precise Computer-Aided Design (CAD) algorithms. The FE models were validated by comparing their results with laboratory measurements. To assess the validity of the assumptions made for calculations, the results of the numerical models were compared with the results of the experimental tests. The study reveals the accuracy of the FE models, which reasonably predicted the failure modes and load-displacement curves, with the ultimate load deviating between 3 and 5\% under compressive loading. It was found that applying the load further to the lower flange is preferable for compression. For positive bending, the models captured the effects of cold-forming on the failure modes and load-displacement curves relatively well. Notably, considering the effects of cold forming on corrugated profiles reduced the ultimate load-bearing capacity by approximately 34\% for an arch with the 12 m radius. The thickness of the steel plate significantly influenced the arch load-bearing capacity. This study contributes to advancing the comprehension of the structural response of doubly corrugated CFS arches and for the development and refinement of design rules for this type of structure.Description
Supervisor
Puttonen, JariThesis advisor
Lu, WeiMa, Zhongcheng