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2024-06-20

Deactivating Self-Weight of Member

How can I deactivate the automatic self-weight for a particular member in my model?


Answer:

In general, RFEM 6 or RSTAB 9 automatically considers the self-weight of the members based on the cross-section, material, and geometry parameters. Thus, you do not need to determine the dead loads manually.

However, if you want to inactivate the self-weight of particular members, you have two options.

Cross-Section with Weightless Material

Define a new material and set the specific weight to zero. The text box for γ becomes accessible once you select the User-defined material option.

Tip

Use the Copy button below the list to copy the original material and customize it. The individual steps are described in the image above.

Define a new cross-section and assign the weightless material. You can use the Copy button here as well to copy the cross-section.

Now, double-click the member and assign this cross-section.

Structure Modification with Member Stiffness Modification

Define a member stiffness modification of the "Multiplier factors of partial stiffnesses, weights, and masses" type. Set the factor kW for the weight to zero.

Create a structure modification. Select the "Members" option, then switch to the second tab.

In the list, select the member modification that you have just defined. In the "Members" column, enter the number of the weightless member.

In the "Load Cases and Combinations" dialog box, select the relevant load cases or combinations. Then, select the "Structure Modification" check box and your structure modification, if it is not set automatically.


Author

Mr. Vogl creates and maintains the technical documentation.