#### Further Information

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• ### How to set the calculation parameters using the COM interface?

FAQ 004184 EN-US

The following code shows how to get different calculation parameters via the COM interface. It also demonstrates how to specify a setting for deactivating shear stiffness:

    '   get model interface    Set iApp = iModel.GetApplication()    iApp.LockLicense        '   get calculation interface    Dim iCalc As RFEM5.ICalculation2    Set iCalc = iModel.GetCalculation        '   get surface bending theory    Dim calc_bend As RFEM5.BendingTheoryType    calc_bend = iCalc.GetBendingTheory        '   get settings for nonlinearities    Dim calc_nl As RFEM5.CalculationNonlinearities    calc_nl = iCalc.GetNonlinearities        '   get precision and tolerance settings    Dim calc_prec As RFEM5.PrecisionAndTolerance    calc_prec = iCalc.GetPrecisionAndTolerance        '   get calculation settings    Dim calc_sets As RFEM5.CalculationSettings    calc_sets = iCalc.GetSettings    'get calculate options    Dim calc_opts As RFEM5.CalculationOptions    calc_opts = iCalc.GetOptions        '   set ShearStiffness to false    calc_opts.ShearStiffness = False    iCalc.SetOptions calc_opts
• ### Can I also use the load generator for members lying not in one plane?

FAQ 004139 EN-US

For irregular member structures, the load generators 'From Area Load on Members via Plane' or with 'Cells' can be helpful. However, both functions assume that the nodes of the members are situated in one plane. In the settings of the load generators, it is possible to increase tolerances for the nodes to also detect nodes that lie outside the plane (see Figure 01). In interaction with the 'virtual lines', it is possible to load even more complex structures.
• ### I get the error message 30420 saying that the tolerance (epsilon) for integration of a node into a line is too large. What can I do?

FAQ 003160 EN-US

The tolerance epsilon can be found in the FE mesh settings in the "General" section of the dialog box. It controls the behavior of the FE mesh generator when nodes are very close to lines. Figure 03 shows the difference. If the tolerance is greater than the distance of a node to a line, this small local difference in the mesh generation is neglected. In the case shown, the mesh of the line is deflected towards the node. In this case, the line is not ideally straight anymore. If the tolerance is smaller than the distance, a separate FE node is generated for the node.

The error message appears if the distance between two adjacent nodes is smaller than epsilon and they are connected by a line (see Figure 03). In most cases, this is due to an inaccuracy in the modeling. Since the error message contains no information about the node numbers, you can use the "Identical Nodes" model check. The program searches for the nodes whose distance meets the tolerance delta. Now, you can set the tolerance value to the value of epsilon. Tthe nodes are then listed in the upper part of the dialog box.

As described below, the descriptions differ depending on the case. If there is an inaccuracy in the modeling, it can be adjusted. In other cases, it is possible to further reduce the tolerance of epsilon, of course.

• ### Why are the tolerance zones between the zone borders 5 km wide on the online snow load map of Austria?

FAQ 003090 EN-US

With the National Annex ÖNORM B 1991‑1‑3: 2018‑12, Austria has textually redrafted the width of tolerance zones.

[1] In the third paragraph under "Annex B," the standard states accordingly that within 2.5 km on both sides of the zone boundary, the characteristic value sk is the average of the affected zones. In the area of Vienna, we can assume 250 m per side. This results in the tolerance zone width of 2 x 2.5 km = 5 km in the country and 2 x 250 m = 500 m in Vienna.

This regulation was applied with the update of ÖNORM B 1991‑1‑3: 2018̩12 on our website Snow, Wind and Seismic Zones.

• ### Some bars are ignored during load generation. What is the reason?

FAQ 002975 EN-US

In most cases, the tolerances are insufficiently defined in the settings for the load generation (see Figure 1). The corresponding members can be recognized very quickly because they are not selected by default when previewing the load plane with the selected members. This is because the affected members lie outside the plane. Thus, further adjustments in the tolerance settings of the area load plane are required.
• ### When generating the FE mesh, an error message appears. This is saying that the tolerance for integrating the nodes in the lines is too large. What can I do?

FAQ 002788 EN-US

Please reduce the maximum distance between the node and the line in the FE mesh settings. Even with a setting of 0.001 m according to the figure, you can enter a smaller value. If the decimal places are adjusted by means of the corresponding settings, the value is also displayed completely.

• ### How can I deactive individual internal forces for design in CONCRETE or RF-CONCRETE Members (for example torsional moment M-T for ribs)?

FAQ 002142 EN-US

The internal forces to be considered in design can be found in the "1.6 Reinforcement" window, "Reinforcement Layout" tab. Here you can select the internal forces, which should not be taken into account for the respective reinforcement group. Please note that this setting is valid for all members of the reinforcement group. You should use this function carefully.

• ### I want to generate imperfections in the add-on module RSIMP using a buckling mode from RSBUCK. However, after I generate the imperfections, I obtain only values for the inclination, the values for the precamber are all zero. Why?

FAQ 000220 EN-US

The values for the precamber are not shown because the ordinate of the buckling mode is probably too small so that it cannot be considered by using the specify tolerance.

In the "Details" dialog box, you define from which ordinate of the selected buckling mode or deformation the imperfection is to be generated.

If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

#### First Steps

We provide hints and tips to help you get started with the main programs RFEM and RSTAB.

#### 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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