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The calculation of out-of-plane moment Mj,z,Rd resistance is based on the publications "DESIGN OF STRUCTURAL JOINTS CONNECTING H OR I SECTIONS subjected to in-plane and out-of-plane bending" by Neumann N, Nuhic F:, EUROSTEEL, 2011 and publication "Single-sided structural beam-to-column joint of H- or I-profiles with bolted endplate exposed to in-plane and out-of-plane bending" by Kristensen SO, Stavanger, 2010.
The study addresses the strong axis beam-to-column joints between H or I section members. The focus is on bolted end-plate joints, with two lines and two or more rows of bolts symmetrical about both the beam's major and its minor axis.
In SCIA Engineer this theory adopted when needed, will be used for all strong-axis frame bolted beam-column and splice connections with I or H sections. The method will be used only for 2 bolts / row configuration.
If needed, the complete weak-axis calculation (out-of-plane moment resistance Mj,z,Rd, shear force resistance Vy,Rd and stiffness for weak bending) may be skipped by activating "Neglect weak-axis calculation" check box in the connection setup. If so, the weak-axis calculation is not performed and a message is displayed on the output in the part dedicated to the weak-axis calculation. The check box is deactivated by default.
If the user wants to perform weak-axis calculation (the check box mentioned above is deactivated), but the connection does not fulfill the required conditions, weak-axis calculation is not performed and the user is informed about that. It is still possible to calculate shear force resistance Vy,Rd even if the conditions are not fulfilled, but only in case design bending moment Mz,Ed is zero.
The additional weak-axis bending unity check is displayed by the check and also linear interpolations for strong and weak-axis bending moment components are performed and unity checks calculated if weak-axis bending moment resistance Mj,z,Rd is calculated:
And in case of design normal force NEd> 0,05*Npl,Rd also:
For further info see chapter: "Interaction with bending".