Answer:
In this case, you can use the "Stiffness" member type. The member stiffnesses can be directly specified in a dialog box that you open with the [Edit] button. Thus, it is not necessary to assign a cross-section.
Assigning Numerical Member Stiffnesses
I have numeric stiffnesses of my members. How can I assign the stiffnesses to a member without having to create a notional material and a cross-section?
Author
Mr. Rehm is responsible for developing products for timber structures, and he provides technical support for customers.
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