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Frequently Asked Questions (FAQ)
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AnswerThe design points in CRANEWAY have been adopted in compliance with the standard. In this case, the stresses are calculated for the following locations:
These points are not displayed in the resulting cross-section graphic in the CRANEWAY program. However, there is always a stress point at the design points 0 and 2 for which the result values can be directly displayed.
- Design Point 0
A periphery of the flange at the web edge or at the fillet start
- Design Point 1
A flange at load application point (this can be checked as wheel spacing in Window 1.4)
- Design Point 2
The flange edge
- Design Point 0
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".
Generally, the calculation of the ideal elastic critical moment Mcr according to DIN 18800 and EC 3 uses the same equation. However, there is an important difference.
DIN 18800‑2 simplifies the factor of the load application point and sets this to 0.5.
On the contrary, EC 3 determined this factor C2 more precisely (LTB 5 manual, Chapter 3.4.3). Depending on the load application, the value of the factor C2 is between 0.41 and 1.562.
If you define the load application point equal to the centroid (doubly symmetric cross-section implied), the Mcr factor is identical according to DIN 18800‑2 and EC 3.
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Wind Simulation & Wind Load Generation
With the stand-alone program RWIND Simulation, wind flows around simple or complex structures can be simulated by means of a digital wind tunnel.
The generated wind loads acting on these objects can be imported to RFEM or RSTAB.
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