#### Further Information

In addition to our technical support (e.g. via email, chat), we also offer an extensive range of free online services available 24/7 on our website.

Receive information including news, useful tips, scheduled events, special offers, and vouchers on a regular basis.

1 - 10 of 430

Sort by:

Items:

• ### How can I teach the program that it automatically increases the longitudinal reinforcement when calculating the deflection of the slabs so that the specified deflection is met?

An automatic increase of the reinforcement for the deformation analysis is not possible. As soon as the deformation calculation is based on the determination of the stiffness, it is not expedient to develop an algorithm that B. increases the reinforcement at the point of maximum deformation. Such a procedure would not result in the deformation being reduced.

Therefore, the reinforcement must be increased manually.

• ### I calculate the deformations at time 0 and at time infinite. The deformations at the time infinite seem plausible to me. The deformations at time 0 seem significantly smaller and therefore implausible. What is the reason?

Please check if the structure tears due to pure load. It is possible that the increase in deformations is mainly caused by creep and shrinkage, which are not active at time 0. In the nonlinear calculation, shrinkage is considered as a strain load, which can cause additional stresses.
• ### Does the program use different values of modulus of elasticity for different temperatures? How to activate it?

New

004835

Temperature-dependent stress-strain properties of an elastic isotropic material can be defined in a diagram or imported from [Excel]. These properties are considered for member and surface elements subjected to thermal load (changes or differences in temperature).

The Reference temperature defines stiffnesses for the members or surfaces that have no temperature loads. For example, if a reference temperature of 300 °C is set, the reduced elastic modulus of this point of the temperature curve is applied to all members and surfaces.

The Options dialog section allows you to control if the Poisson's ratios that are applied to the complete temperature diagram are identical. Clear the check box to access the Poisson's Ratio table column for individual entries.

You have to select and define the Temperature/Modulus diagram by your own.

• ### I am using COM interface and Grasshopper for the calculation of complicated structures. For this task I need to create NURBS lines. Could you explain how NURBS should be set? For example what kind of data should be provided for Knots?

New

004832

In the FAQ downloads you'll find a sample code how to set NURBS surfaces. The knot vector KnotsX, KnotsY determines how the control points affect the NURBS curve. The number of knots is equal to the number of nodes plus order.

• ### I cannot find any reason why no plastic design is performed for a class 1 cross-section. Normally, you have to select the check box for the elastic design.

In principle, the program always tries to perform a plastic design for cross-section classes 1 and 2. However, if torsion is additionally contained, the design can only be performed elastically. This is due to the interaction conditions according to EN 1993-1-1 clause 6.2.9, which do not include any torsional component.

For this reason, the "Cross-Section Design and Torsion" setting is available in the details of the add-on module. By adjusting the limit shear stress for the cross-section designs, you can also neglect the torsion under your own responsibility.

• ### I would like to export the reinforcement of a slab in the Nemetschek format. However, no setting is available in the following window after selecting the surface.

When exporting the data to the Nemetschek format, the grayed-out options are generally not available. Everything is always exported.

You can only select the options when exporting the results to the Glaser format.
• ### How can I quickly transfer a modified value to the other rows in the input table of an add-on module?

In addition to the standard functions, all input tables in the program also have the block functions. They allow you to edit marked numbers and number fields in the table in one step.

You can access the block functions by right-clicking in the table:
1. Add - A value is added to or subtracted from the selected cells with a numerical value.
2. Multiply - Cells with a numerical value are multiplied by a factor.
3. Divide - Cells with a numerical value are divided by a divisor.
4. Set - The value of the first selected cell is set to all cells in the selection.
5. Generate - Cells between the first and the last selected row are generated by interpolation of both edge values.

The "Set" function allows you to quickly transfer a value to other rows.

These functions are an ideal tool for changing the existing node coordinates to a new geometry, for linear extrapolation of unit load entries to any value, for unifying the values, ​​and much more.
• ### I would like to use surface releases to model a bolt connection, which can only absorb compressive stresses from the support. Unfortunately, I cannot do this because my model is always unstable. Is there a model as a template?

The best way is to create the bolt as a single solid and not from several partial solids (within the hole). Then, you can arrange the surface release between the contact surfaces of the solids. In the case of a bolt connection, the setting for the surface release type would have to be defined with a nonlinearity in the uz direction.

As an alternative, you can also enter releases and spring stiffnesses for the other directions.

• ### Why do I only obtain the seismic loads calculated in one direction in the case of design with RF‑/DYNAM Pro?

You have probably selected too few mode shapes in the "Natural Vibration Cases" window of RF‑/DYNAM Pro. In this case, it may happen that the defined mode shapes do not vibrate in all directions and thus no mass is excited in these directions.

Therefore, you should calculate at least so many mode shapes that the required 90% of the mass is excited in each direction in your calculation.

This is also described in more detail in the FAQ under the link below.

• ### The technical article about a result beam says that it should rest in the center of gravity of the considered objects. Does this mean the centroid of stiffness? Can I display it graphically with coordinates?

004743

In this case, the center of gravity is the geometric center of gravity of the considered objects. This can be generated by the program: Select all relevant objects and then right-click one of these objects. In the shortcut menu, select the "Center of Gravity and Info..." feature.

1 - 10 of 430

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.

#### Your support is by far the best

“Thank you for the valuable information.

I would like to pay a compliment to your support team. I am always impressed how quickly and professionally the questions are answered. I have used a lot of software with a support contract in the field of structural analysis, but your support is by far the best. ”