Abstract：To solve the instability problem of newly designed double-limb cold-formed C-shaped steel yurts under vertical loads such as ice and snow, the stability performance of a double-limb cold-formed C-shaped steel portal frame with an in-plane toono was investigated. The failure modes and bearing capacity of this type of portal frame were analyzed through testing and numerical simulations using three parameters: the slope of the inclined beam, the height-to-span ratio, and the toono diameter. The results show that increases in the inclined beam slope and the toono diameter can increase the load bearing capacity of the rigid frame, and an increase in the high span ratio of the rigid frame then reduces the rigid frame’s load bearing capacity. Following consideration of the influence of the inclined beam slope and the lateral displacement of the column top, the work in this paper indicates that the inclined beam slope should be designed to be within 20°, where the column effective length coefficient is calculated to be safe according to TheTechnical Code for Steel Structure of Light-Weight Building with Gabled Frames; this also meets the engineering design requirements.
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