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, it is possible to resize them by right-clicking next to the symbol area.
AnswerWhen determining the torsional moment of inertia, point elements are not considered for I t in the analytical equations. Therefore, for cross-sections with distinct fillets such as B. rolled cross-sections, a correction factor is applied to determine the effect of the point elements. Figure 01 shows recommendations for different types of rolled cross-sections. This correction factor can be adjusted in the calculation parameters. In addition, the torsional moment of inertia can also be calculated with the FE method, which also covers the effect of point elements and welds. This approach requires slightly more computing time than the analytical calculation.
AnswerMembers with the member type "Spring" or "Damper" have only axial stiffness, that is, in the direction of the local x-direction. The bending stiffness and the stiffness perpendicular to the longitudinal axis of the member are negligibly small and are not considered in RFEM and RSTAB.Consequently, if a spring is to be used in the structure, it acts only in one direction; in the other two directions (local y- and z-direction), this member type must receive an additional support, otherwise the system becomes unstable.
AnswerUnfortunately, there is no option in the program. Here, you only have the possibility to edit the existing load and, if necessary, redefine it.
AnswerThe font size of the title and Max / Min info can be set in the display properties. To use this function, select Options → Display Properties → Edit in the menu.
AnswerIf stiffeners are welded into the runway girder, the corresponding notch design according to EN 1993-1-9, Table 8.4, detail 7 has to be considered for the fatigue design. This is implemented in CRANEWAY by creating additional stress points at the connection point of the stiffeners to the section. They can be adjusted manually in the settings for the notch cases depending on the geometry of the stiffener.During the fatigue design of the crane runway girder, the design of the normal stress range is additionally performed in the newly created stress points for the x-locations on which a stiffener is provided.
AnswerTo provide members with different supports, it must consist of several members and be designed by a set of members. Different parameters can then be assigned to the individual members. The procedure can be found in the video.
AnswerIn the case of long crane runways and many cranes, the large number of load combinations can lead to a long calculation time. The following settings affect the calculation time significantly:
Method of calculation for determining internal forces
The fast calculation type may therefore be useful for the preliminary design.
- Fast calculation (calculation of all load combinations according to the 1st-order analysis, then calculation of the governing load combinations according to the second-order bending-torsion analysis)
- Detailed calculation (calculation of all load combinations according to second-order bending torsion analysis)
Desired maximum length of the finite elementsThe maximum length of the finite elements generated for the calculation according to the second-order analysis for flexural-torsional buckling analysis can be entered within a range of 100mm to 2500mm. A finer division of finite elements significantly increases the calculation time.Thus, you should select a reasonable length of the finite elements for an optimized calculation time depending on the structural system. In general, eight elements per beam surface are sufficient to calculate the deformations with a deviation of less than 5% relative to the exact solution.
Number of load combinationsYou can use a reasonable setting of the moving step to control the number of generated load combinations. When entering the moving step, the generated number of crane load positions and load combinations is already displayed in a preview. A small increment results in many load combinations that take more time in the calculation.
AnswerWhen I have a trapezoidal load value that tends to zero for example, it may happen that the scale is correct for small values displayed. In this case, there is a setting error in the display properties.It will simply proceed as follows:
Important note :1- The value zero is not displayed on the loads (cf. figure 3)2- When a zero value is displayed, it certainly contains decimal digits. By zooming in, you discover that the diagram does not form a closed angle at the end. (Cf. figure 4)
- Right click on the load to access its context menu
- Select "Display Properties ..."
- Click on the magnifying glass at the height scale of size 1 [kN / m]
- Fill in eg the most minimal value of the minimum limits at 0.1%
- Confirm by clicking on OK
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