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Frequently Asked Questions (FAQ)
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AnswerIf stiffeners are welded into the crane runway, the corresponding notch category 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 detail categories depending on the geometry of the stiffener.During the fatigue design of the craneway girder, the design of the axial stress range is additionally performed in the newly created stress points for the x-locations on which a stiffener is provided.
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:
Calculation method for determining the 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 second-order analysis for torsional buckling)
- Detailed calculation (calculation of all load combinations according to second-order analysis for torsional buckling)
Maximum target length of the finite elementsThe maximum length of the finite elements generated for the calculation according to the second-order analysis for torsional buckling can be entered within a range of 100 mm to 2500 mm. The calculation time can be increased significantly by the finer division of finite elements.Thus, you should select a reasonable length of the finite elements for an optimized calculation time depending on the structural system. Usually, 8 elements for each girder span are enough to calculate the deformations with a deviation of less than 5% relative to the precise solution.
Number of load combinationsYou can use a reasonable setting of the load increment to control the number of generated load combinations. When entering the load increment, the generated number of crane load positions and load combinations is already displayed in a preview. A small load increment may result in many load combinations that take accordingly more time in the calculation.
AnswerWith the FE mesh refinement, it is also possible to create an aligned FE mesh in the program. Thus, the automatic FE mesh generator can be controlled to a certain extent. However, it is not possible to use it for setting of a specified mesh geometry.
AnswerIn CRANEWAY, you enter the exposure category declared by the manufacturer for each crane. For the fatigue design, CRANEWAY performs the designs for the individual damage as well as for the total damage from both cranes. According to EN 1993-6 chapter 9.4.2, the rule recommended in NOTE is applied. Considering two cranes, the exposure category of the crane with the lowest exposure category is reduced by 2 for the total damage.
Crane 1 S-Class: S6 Crane 2 S-Class: S5 Total damage S-Class: S3
AnswerThe setting of partial safety factors can be done by defining the National Annex of the standard in the General Data. The predefined National Annexes can not be modified, but it is very easy to create a user-defined National Annex.In this case, it is possible to adjust all standard-specific factors.
The distances of the crane axes can be entered in the "1.4 Loading" window within the crane parameters depending on the number of crane axes, see Figure 1.
AnswerThe Steel Type used is carried out in window 1.1 General Data of the CRANEWAY program (except in the RSTAB8 user interface). The list contains the types of steel that depend on the selected standard.You can select steel St 37 if you select the design standard "DIN 4132" (see Figure 1).When you select EN1993-6, you can also create your own User-defined material and use it for the design (see Figure 2).
AnswerUnfortunately, this is not possible yet. The additional loads can only be considered as a uniformly distributed load over the entire beam.
AnswerIn the definition of the carrier geometry in mask 1.2, the option "Vertical stiffeners at the end of the carrier" is activated as standard in the tab "Stiffener". Proceed as follows
Now the overhead crane can go beyond the beam ends.
- In Mask 1.2, open the "Stiffen" tab and deactivate the option (Fig. 01)
- Now you can deactivate the stiffeners in column K in the "Storage" tab (Fig. 02)
- In mask 1.4 "Load", the carrier buffers can now be deactivated (Fig. 03)
Entering a sway bracing as a structure is currently not possible in CRANEWAY. However, you can determine the replacement spring in RSTAB or RFEM, which can then be considered as lateral support in CRANEWAY. Proceed as follows:
- Model the sway bracing in RSTAB or RFEM
- Apply the unit load 1kN at the location of the lateral support
- In this way, determine the nodal deformation in global Y for each position of the lateral support.
- Calculate the equivalent spring from the determined deformation and the load. (see Figure)
This method is not recommended in specialized literature. The reason for this is that the spring stiffnesses change for each wheel position and furthermore the RFEM for the crane runway girder in its capacity as truss flange remains unconsidered in the design.
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