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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 load application point in RF-/FE-LTB depends on the local member axis system. Define, for example, For example, if a horizontal member (global Z-axis is pointing downwards), the axis z of the local axis system is also pointing downwards in the positive Z-direction. If you want the load to act on the top side, enter a negative value for ez. For a horizontal member, it does not matter in which direction the member direction runs, the local axis z always points downwards.
The situation is different for a vertical member. In this case, the member direction runs from top to bottom and the local axis z of the local axis system points in the negative X-direction. If a positive value is entered for the eccentricity ez, this corresponds to a load application on the upper chord and thus leads to a greater utilization.
You can activate the display of the local axis system of each member in the "Display" navigator by activating the option "Member Axis Systems x, y, z" under "Model" -> "Members".
The calculation of M Ki is based on the same formulas. Nevertheless, there is one big difference:
DIN 18800-2 simplifies the coefficient of the load application point C 2 and sets it to 0.5. Eurocode 3 captures this factor more precisely. Depending on the load, C 2 can be between 0.41 and 1.562.
If the load application point is set in the center of gravity (assuming double-symmetrical profile), identical M Ki values result according to DIN 18800 and EC 3.
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Wind Simulation & Wind Load Generation
With the stand -alone program RWIND Simulation, you can simulate wind flows around simple or complex structures 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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