The data exchange between RFEM 6 and Allplan can be done using various file formats. This article describes the data exchange of a determined surface reinforcement using the ASF interface. This allows you to display the RFEM reinforcement values as level curves or colored reinforcement images in Allplan.
When modeling structural systems or loads, input errors or faulty objects may occur due to subsequent modifications, displacements, and adjustments in the model.
Creating a validation example for Computational Fluid Dynamics (CFD) is a critical step in ensuring the accuracy and reliability of simulation results. This process involves comparing the outcomes of CFD simulations with experimental or analytical data from real-world scenarios. The objective is to establish that the CFD model can faithfully replicate the physical phenomena it is intended to simulate. This guide outlines the essential steps in developing a validation example for CFD simulation, from selecting a suitable physical scenario to analyzing and comparing the results. By meticulously following these steps, engineers and researchers can enhance the credibility of their CFD models, paving the way for their effective application in diverse fields such as aerodynamics, aerospace, and environmental studies.
When wind-induced surface pressures on a building are available, they can be applied on a structural model in RFEM 6, processed by RWIND 2, and used as wind loads for static analysis in RFEM 6.
You can select an object in RFEM or RSTAB by simply clicking it. However, only the last object clicked will stay selected. In order to select several objects at a time, press the Control key while clicking. Since this procedure is not always possible, you can use the "Add to Selection" function in the toolbar or in the "Edit" → "Select" menu.
A modell check allows you to find overlapping members, among other things. However, this targeted selection could cause some minor problems. Therefore, there is a selection window now available, which appears when you click on one of the elements. This appears by clicking on one of the elements. Additional information helps you to select the correct member.
You may already be familiar with the "Center of Gravity and Info" function, which can be accessed using the shortcut menu of any element. If you want to display this information on several elements consecutively, you have to close the dialog box and open the shortcut menu of the next element over and over again.
In RFEM, if you want to display a curved geometry (preferably in one continuous line), you can use splines or NURBS, for example. When modeling, you should pick the individual nodes one after another. If a mistake is made, you can go back using the special Undo function in the "New Spline Line" window. Thus, it is not necessary to enter the entire continuous line again.
With the "Info About Object..." function available in the menu under "Tools", you can display all the information about an object by placing the cursor on it in the graphical window.
Sometimes, a model in the graphic window is displayed without filling the entire window, or with overly large margins after clicking the [Show Whole Model] button. To set the size of the graphic margins, click "Options" → "Display Margins and Stretch Factors". The value specifies the percentage of the margin relative to the graphic window size.
CFD calculations are in general very complex. An accurate calculation of wind flow around complicated structures is very demanding on time and computational costs. In many civil engineering applications, high accuracy is not needed and our CFD program RWIND 2 enables in such cases to simplify the model of a structure and reduce the costs significantly. In this article, some questions about the simplification are answered.
The geometry data of an RFEM model are currently managed in 29 tables, so not all of the tabs are displayed at once. To open a particular table, we recommend using the navigation menu that you can open by right-clicking on any tab. A shortcut menu appears, where you can quickly access the desired input table.
RFEM and RSTAB provide the option to create load and result combinations automatically according to the combination expressions defined in the standards. Partial safety factors and combination coefficients are specified in the standards or National Annexes. You can customize them as necessary and save them in a modified standard.
In RFEM and RSTAB, you can now rotate nodal loads or apply them on member axes. Thus, inclined members can also be loaded with nodal loads perpendicularly or along the member axis.
The network-capable Project Manager controls the projects of all Dlubal Software applications in one central location. A table displays the important information for each model and corresponding file. Now, you can set dimension and weight units in the program options.
Surfaces can be created using the "Surface via Line Extrusion" function by extruding lines perpendicular to the active work plane. The Video (WMV) shows how to use this function.
If intersections created in RFEM 4 are opened in an RFEM 5 file, the file management of intersections remains in the old format for compatibility reasons. Thus, the individual partial surfaces of the intersection can be activated or deactivated using only the "Integrated/Components" tab, all partial surfaces can only have the same thickness, and it is impossible to use the separate FE mesh refinement for the individual surface components.
The local coordinate system of a member is particularly important when defining member end releases and member nonlinearities. The definitions follow the orientation of the axes. You can temporarily adjust the visibility of these member axes by means of preselection.
In RFEM and RSTAB, you can create a combination scheme in the combinatorics of load cases and combinations. This scheme can be used for other projects by transferring it to other computers using the Export/Import function. Thus, multiple people working on a project can use the same scheme.
If you want to design structural components in an RFEM or RSTAB add‑on module, several National Annexes are available in some add‑on modules. In the case of structures that are to be analyzed mainly according to a specific National Annex, the add‑on modules provide the option to set a default value. Thus, it is unnecessary to select the NA again for each new model.
In RFEM and RSTAB, load cases can be combined automatically using combination coefficients (partial safety factors) in order to determine the required design situations.
If a section is not on a straight line but on a curved or angled line, this line has to be defined accordingly as a polyline or a curved line. You can define the section along a line using the "Create Section Numerically" function.
When calculating foundations according to EC 7 or EC 2, different foundation types or sizes are usually used in one object. However, boundary conditions like the soil parameters, the materials for foundations, concrete covers, and the load combinations selected for design remain the same for all foundations, as a rule.
User-defined views are a very useful tool for effective modeling, as the previously selected and adapted objects appear directly with a click of the mouse. These objects can also be used easily to create informative and clearly arranged result graphics. With just a few clicks, you can create all result graphics at once using the mass print function.
Generally, RFEM automatically detects all objects lying on a surface that are not used for surface definition. Objects integrated into surfaces can be selected using the "Select Integrated Objects" option in the shortcut menu of the relevant surface in Project Navigator. This way, you can easily find in the graphics which objects have already been integrated into a surface, for example.