We provide hints and tips to help you get started with the basic program RFEM.
FAQ 003303 | How can I display nodal masses?
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First Steps with RFEM
Question
How can I display nodal masses?Answer
For members (RSTAB) or members, surfaces, and solids (RFEM), you can display the material weight W. For this, simply select the entire structure or a part of it and right-click to open the shortcut menu. Here, you can find the "Center of Gravity and Info ..." option.
However, the nodal masses are not apparent from this.
To generate the nodal masses, you can use the RF‑/DYNAM Pro - Natural Vibrations add-on module. In this case, it is possible to create a natural vibration case where the mass only actsin the Z direction, for example. After the natural mode case has been calculated, the "nodal masses" are available in the result tables of RF‑/DYNAM Pro.
In RF‑/DYNAM Pro, you can optionally convert the nodal loads into masses by applying the force components of the respective load case to the natural vibration case calculation.
Keywords
Dlubal FAQ Nodal mass Mass Node Mesh node Mesh point Modal mass Frequently Asked Question FAQ about Dlubal Question and Answer about Dlubal
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Using Modified Stiffnesses for Dynamic Calculations
In RFEM, it is possible to modify stiffnesses for materials, cross -sections, members, load cases, and load combinations in many places.
Considering the Stiffness of Gas Solids in Nonlinear Time History Analysis
The stiffness of gas given by the ideal gas law pV = nRT can be considered in the nonlinear dynamic analysis.
The calculation of gas is available for accelerograms and time diagrams for both the explicit analysis and the nonlinear implicit Newmark analysis. To determine the gas behaviour correctly, at least two FE layers for gas solids should be defined.
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