Doubly corrugated steel arches are made by pressing transverse corrugations on trapezoidal cold-formed steel sheets. Several studies show that these transverse corrugations may have a significant detrimental effect on the stiffness and load-bearing capacity of the original trapezoidal profile. The paper presents a process for deriving the effective properties of the sheet cross-sections accounting for the transverse corrugations. The arches are subjected to combined compression and bending; consequently, two different sets of effective properties are determined. On the one hand, the bending properties are derived from experimental tests on sheets with a single transverse corrugation. The six-point bending test proposed by Eurocode 3, Part 1-3, is applied in this case. Conversely, there is no standardized test to derive the compression properties of sheeting with or without corrugations. Furthermore, conducting such experimental tests is difficult due to the large dimensions of the sheet cross-sections and the presence of the corrugation, which prevent the application of pure compression loading. Although the failure of the arches is mainly governed by bending, it is demonstrated that a rough estimation of the effective cross-section area and centroid is not sufficient to predict the load-carrying capacities of the arches. Various simplified calculation procedures for determining the compression effective properties are presented and applied. These properties are then implemented in a practical design approach using nonlinear 2D beam finite element models of the arches. Their performance is assessed through experiments on full-scale arches with spans ranging from 10 to 20 m.