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Frequently Asked Questions (FAQ)
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AnswerUnfortunately, the division of Quadrangle surface can not be performed as easily as planar surfaces. The procedure is shown in the video. To obtain two surfaces, either delete and create the surface again, or modify the boundary lines of the surface and recreate the second surface.
AnswerThese lines represent the local torsion rotation (see Figure 01). By default, only torsion rotations φx with normalized values greater than 0.2 are displayed. This ensures that the graphic is clear. The graphical representation is controlled directly in the add-on module (see Figure 02).
In RF-/CONCRETE Columns, the column is designed as a "structural component".When displaying the results "Bending", "Shear Force" and "Bending - Fire Resistance", the maximum value of the design criterion is output as a single value at the governing location (x-location) of the respective design. For example, at the column base, column head, or in the center of the column.If the result display "Maximum Design Criterion" is selected, the maximum value of all design criteria is displayed across the entire "structural component" (column).
AnswerYou must authorize the program to the full version on the affected computer and save the project before it can be opened elsewhere.
AnswerIn this case, it is worth taking a look at the stress points in the cross-section details. If they are not accessible (grayed out), no stress points have been defined in SHAPE-MASSIVE and a design is not possible. In SHAPE-MASSIVE, the option "Stresses in stress points" must be activated in the general data. After recalculating and saving, the cross-section can now be designed in the RF-/STEEL add-on module.
AnswerThe internal forces and deformations are determined according to the second-order analysis for flexural-torsional buckling taking into account 7 degrees of freedom. For a linear calculation of deformations, a vertical/horizontal load results in only one vertical/horizontal deformation. Since the internal forces refer to the deformed system and it is a nonlinear analysis, this is not valid for the second-order analysis for flexural-torsional buckling.
The deformations in the shear center can be checked in RSTAB and RFEM with the RF-/FE-LTB add-on module (see Figure 02). The deformations that additionally result from the displacements or rotations can only be controlled with a surface model in RFEM.
For surface supports, this option is only available if a nonlinearity in the local z direction has also been defined (failure if contact stress in z is negative/positive). In the dialog box where you can edit the nonlinearity, there is the option "Friction in plane xy".
This option works as shown in the graphic dialog box: The support in x and y direction is only completely assumed when the contact stress Tau (contact stress sigma by friction coefficient) is reached. Before this is reduced linearly.
In order to use this option, it is necessary to define a support in the horizontal directions. It can be defined as fixed or with an elastic spring. If the spring is defined with 0, no support is considered even when a friction coefficient is entered.
AnswerIf you are using members with cross-sections, which are not known be the interface, you should use the mapping file for cross-sections. The mapping file can be easily filled with the names of the cross-sections. In the left column of the table write the names of cross-section used in TEKLA and in the right column you write the DLUBAL names or select them from the library.Please check the attached video.Note:
In TEKLA you have to have loaded the right environment. In the video Chinese cross-sections should be transferred, so the Chinese environment has to be used in TEKLA.
Define a suitable load case to correctly combine the planned prestress with the other load cases and apply a "pulling" strain to the members affected. A pulling strain load can, for. B.
Input via a Longitudinal Displacement is the most comprehensible input because you can directly measure the offset on the turnbuckle of a tension member.
- a negative temperature load T c distributed uniformly over the cross-section,
- a negative change in length ε,
- a negative longitudinal displacement Δl,
- a positive initial prestress V or
- its positive final prestress V only in RFEM.
The logs or log files of an installation can be found under the following path:
C: \ Users \ Public \ Documents \ Dlubal \ Logs
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