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Frequently Asked Questions (FAQ)
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AnswerThe 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 interfaceSet iApp = iModel.GetApplication()iApp.LockLicense' get calculation interfaceDim iCalc As RFEM5.ICalculation2Set iCalc = iModel.GetCalculation' get surface bending theoryDim calc_bend As RFEM5.BendingTheoryTypecalc_bend = iCalc.GetBendingTheory' get settings for nonlinearitiesDim calc_nl As RFEM5.CalculationNonlinearitiescalc_nl = iCalc.GetNonlinearities' get precision and tolerance settingsDim calc_prec As RFEM5.PrecisionAndTolerancecalc_prec = iCalc.GetPrecisionAndTolerance' get calculation settingsDim calc_sets As RFEM5.CalculationSettingscalc_sets = iCalc.GetSettings'get calculate optionsDim calc_opts As RFEM5.CalculationOptionscalc_opts = iCalc.GetOptions' set ShearStiffness to falsecalc_opts.ShearStiffness = FalseiCalc.SetOptions calc_optsIn the annex, there is an EXCEL macro to download.
AnswerFor 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.
AnswerThe 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.
With the National Annex ÖNORM B 1991‑1‑3: 2018‑12, Austria has textually redrafted the width of tolerance zones.
 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.
→ See Snow Load Map of Austria
This regulation was applied with the update of ÖNORM B 1991‑1‑3: 2018̩12 on our website Snow, Wind and Seismic Zones.
AnswerIn 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.
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.
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.
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.
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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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