We provide hints and tips to help you get started with the main programs RFEM and RSTAB.
I have the following problem occurring in RF-/FF-LTB: To analyze the effect on the load application point, I have defined the eccentricity e-z one time positively and another time negatively. A positive value, which means a load application on the lower chord, should be a contribution to the stabilization of the structural system. But this is not the case. What do I have to do?
The definition of the point of load application in RF-/FE-LTB depends on the local member axis system. For example, if you define a horizontal member (global Z-axis points downward), the z-axis of the local axis system points downward as well (in the positive Z-direction). Now, if you want the loading to act on the upper side, you have to enter a negative value for e-z. Moreover, for a horizontal member it doesn't matter in which direction the member orientation runs: The local axis z always points downward.
This is different for a vertical member. In this case, the member orientation runs from top to bottom, and the local axis z of the local axis system points to the negative direction X. Now, if a positive value is entered for the eccentricity e-z, this input corresponds to a load application on the upper chord and thus results in a higher utilization.
You can activate the graphical representation of the local axis systems for each member in the Display navigator by selecting the option "Model" > "Members" > "Member Axis Systems x,y,z".
Have you found your question?
If not, contact us or send us your question via the online form.
Your support is by far the best
“Thank you very much for the useful information.
I would like to pay a compliment to your support team. I am always impressed how quickly and professionally the questions are answered. In the industry of structural analysis, I use several software including service contract, but your support is by far the best.”