Thin-walled steel structures offer several advantages over conventional steel structures, especially for projects subjected to light loads such as warehouses, workshops without overhead cranes, and garages. Their outstanding features include aesthetic appeal, load-bearing capacity, material savings, lightweight, and rapid construction. However, in our country, the design calculations for this type of structure are still relatively unfamiliar to most engineers, particularly in connection design. Many engineers continue to use hot-rolled steel design standards such as TCVN 5575:2012 for calculating connections for thin-walled structures, which is not suitable. In some cases where experimental validation is not available, it is possible to refer to the methods outlined in the American specifications (AISI) for analyzing connections and calculating based on elastic limit problems. This paper presents a practical calculation problem for theconnections of a single-story, single-span steel frame with I-sections assembled from two C-sections in cold-formed thin-walled steel. Keywords: Cold-formed thin steel, yield strength, tensile strength, cold-formed C-section.
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