Check out these tips to help you get started with the RFEM program.
Calculation of Initial Stiffness Sj,ini
First Steps with RFEM
In the Steel Joints add-on, you can determine the initial stiffness Sj,ini according to Eurocode and AISC. This can be done for the selected members with reference to the internal forces N, My, and Mz.
In the Members tab of the input dialog box of the Steel Joints add-on, you can select the desired internal forces via a checkbox. Multiple selection is possible! For these internal forces, the stiffness analysis is carried out with a positive and a negative sign.
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Moment frame design according to AISC 341-16 is now possible in the Steel Design add-on of RFEM 6. The seismic design result is categorized into two sections: member requirements and connection requirements. This article covers the required strength of the connection. An example comparison of the results between RFEM and the AISC Seismic Design Manual  is presented.