In addition to our technical support (e.g. via chat), you’ll find resources on our website that may help you with your design using Dlubal Software.
Frequently Asked Questions (FAQ)
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AnswerYes, in the global selection, it is possible to select the chapters that you want to get displayed in the printout report. To access this function, use the menu 'Edit' → 'Selection'.The four checkboxes in the "Display of" section at the bottom left control whether a cover sheet, a table of contents, small info pictures, and large headings should be displayed in the report margin.
The wind directionality factor (Kd) from the ASCE 7-16 Sect. 26.6 is considered in the ASCE 7-16 wind load profile or RWIND Simulation calculation and can be adjusted manually by the engineer. The wind directionality factor (Kd) can be considered in RWIND Simulation by modifying the factor under the wind veloicty profile settings before running RWIND Simulation in RFEM.
This factor for various structure types can be determined from table 26.6-1 from the ASCE 7-16 .
AnswerIn the navigator of the printout report, some chapters are marked with a red pin. This chapter starts a new page.If you remove the pin you will not get any space on your sheet, and the chapters will be moved together.
AnswerYes, it is possible.You can enter all the data necessary for:
If the cross-section description from the Dlubal cross-section library is known, this can also be entered directly in Column A in Table 1.13. Otherwise, you can use the cell to open the cross-section library.This is also possible in RSTAB. Here, it is not required to enter the line. This is only necessary in RFEM.
To correctly combine the planned prestress with the other load cases, define a suitable load case and apply a "pulling" strain load to the members concerned. The pulling strain load can be, for example:
The input by using the axial displacement is the most comprehensible input as you can directly measure the displacement at the turnbuckle of the tension member.
- a negative temperature load Tc distributed uniformly over a cross‑section,
- a negative axial strain ε,
- a negative axial displacement Δl,
- a positive initial prestress V, or
- a positive final prestress V (in RFEM only).
AnswerThis may be caused by the definition of member eccentricities. For a better overview, the original lines are automatically hidden in the case of eccentric members. In some cases, it may appear that a member end is not sufficiently supported (see Figure 01, left). However, the meshed line acts in the background. This can be clearly displayed by hiding the members in the Display navigator (see Figure 01, right).In Figure 01, the line at the common node has not been divided geometrically. For this reason, there is no graphical connection line representing the eccentricity, which would result in this case. However, because of the setting displayed in Figure 02, the node is still meshed with the vertical member.In order to display the graphical connection line, it is recommended to divide the member or the line at this node (see Figure 03).
AnswerThe members with the "Spring" or "Dashpot" member type only have theaxial stiffness, that is, in the direction of the local x‑direction. The bending stiffness and the stiffness perpendicular to the longitudinal member axis are negligibly small and are not considered in RFEM and RSTAB.If there should be a spring used in the structure, it only acts in one direction; in the other two directions (local y- and z-direction), this member type must have an additional support, otherwise the system becomes unstable.
AnswerThis message indicates that the critical load of the structure or the cross-section has been exceeded.The causes for this are very diverse. There are often insufficient lateral supports defined in the STEEL EC3 add-on module.It is also possible that the used cross-sections or the structure itself cannot be calculated according to the general method in EC3. This FAQ provides more information about this issue.
AnswerPlease check if all sets of members selected for the design are straight sets of members. The equivalent member method is only applicable for straight sets of members with a uniform cross-section, so no taper is applicable, for example. In this case, use the preset General Method.
AnswerThe graphical result display always shows the extreme values of all support reactions. That is, the largest and the smallest values across all combination possibilities. The individual support forces cannot be combined in this way as they usually occur in different load situations.
However, the extreme values with the corresponding results are displayed in result tables. Furthermore, Column H shows the corresponding load combination or the corresponding load cases by default.
If you only need to display the extreme values of PZ with the corresponding horizontal forces, you can use the filter function of the result table as shown in the figure.
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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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