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  • Answer

    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.

  • Answer

    The problem occurring when importing DXF drawings cannot be avoided.

    However, you can use the plausibility check or other functions available for the elimination of double coordinates. Here are some of them:

    • Connect members
    • Join members
    • Plausibility check -> identical nodes
    • Regenerate model -> round node coordinates
    Connect members

    With this function (Tools -> Connect Members) you draw a window over the relevant area in RSTAB. If there are members intersecting with nodes, they will be automatically divided.

    Join members

    With this tool (Tools -> Join Members) you can define an area around a node/member and join the nodes lying in a particular radius to this node/member, either eccentrically or by shifting.

    Plausibility -> identical nodes

    allows for selecting double nodes. Among the settings you can specify for example that all nodes are merged in the same node and that also all related properties have an effect on this node (supports, eccentric connections, etc.).

    Regenerate model -> round node coordinates

    Nodes with many decimal places resulting from the import can be rounded down.

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First Steps

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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