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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AnswerIn most cases, the problem is that in the edge area of the cushion, the finite elements of the cover surfaces are very close to each other when Bezier surfaces have been used. The FE mesh nodes of the bottom and top surface may then be combined. The FE mesh nodes of the bottom and top surface may then be combined.1. Numerical correction of the problem:You can adjust the tolerance for combining FE mesh nodes via the menu 'Tools' → 'Regenerate model'.2. Solving the problem geometrically:The more reasonable solution is to increase the distance between surfaces by edge surfaces, as shown in Figure 01.
AnswerYes, the data is freely available. Use the following download option to load the presentations and finished models of the consultants.
The directions of the warp and weft are linked to the axes of the surface. With the default setting, only an isotropic prestress can be applied. If the axes are aligned, orthotropic or radial prestress will be available as well.
The procedure is demonstrated in the video.
AnswerThe sag can be influenced by the prestress of the membrane. Please note that a uniform increase in both directions does not cause any changes in the shape. Thus, a modification must only be made in the desired direction. The video shows the procedure.
AnswerDeformation of members are displayed as single colored lines per default. Please let them displayed as colored cross-sections. Therefore, it is always a good idea to decrease the Display factor by the deformation to 1.0, otherwise, the results might be misinterpreted.
AnswerThe deformations of load cases and load combinations always refer to the deformed form-finding and thus to the shifted FE mesh. In this case, the result is saved in the 'DL_LK_DEFORMATION u' layers. The 'DL_FE_MESH' layer shows the result of the form-finding. The initial structure is situated in the 'DL_TOPOLOGY' layer.If the DXF file was generated when the 'Form-finding' load case is active (see Figure 02), that is, not via a load case or a load combination, the deformation for the initial structure can be found in the 'DL_FE_MESH' layer. The deformations of the 'DL_LK_DEFORMATION u' layers are not important in this case and should be hidden.Basically, the display factor should be set to '1' when exporting the deformed structure (see Figure 03). Defining a larger or smaller factor also affects the result in the DXF file.
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.
AnswerThe load from the form-finding load case (FF) is impressed 1.0-fold into the system. If you want to factorize the dead-load in combination with combinatorics, it is possible to additionally create a permanent load case for the dead-load with a load of 0.35 times the load.
AnswerSuch an effect could be caused by free edges, which can be deformed almost infinitely during the form-finding process. In this case, it is difficult to achieve the state of equilibrium.As a basis for the form-finding, there should be no free edges on the membrane surface. There must be cables arranged on the free edges of the membrane whose stiffness can be based, for example, on the folded or strengthened membrane edge strips.
For form-finding, it is primarily important to apply the prestress for the membrane and the border cables that are possibly available. It is not necessary to prestress the riggings.
The riggings can be created as a tension member with its initial length (see the figure). Due to the prestressed membrane and the border cables, the load for the rigging results during the calculation.
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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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