In addition to our technical support (e.g. via chat), you’ll find resources on our website that may help you with your design using Dlubal Software.
Frequently Asked Questions (FAQ)
Search FAQ
Further Information
Customer Support 24/7

Answer
By default, the fire resistance design is not implemented in the RFLAMINATE module.However, it is possible to calculate the burnup rates yourself and consider them accordingly in the module. The following example explains this on a simple plate.System (Figure 1): Span 5m
 Slab width 2m
 LC1 (permanent) 1kN/m² plus selfweight
 LC2 (medium) 2.5kN/m²
 3 layers
 S1, 35mm, C24
 S2, 20mm, C24
 S3, 35mm, C24
Factors Fire Resistance: Burning rate ß_{0} = 0.65mm/min
 Pyrolysis zone k_{0} d_{0} = 7 mm
 Burning time t = 30min
 Effective thickness d_{ef} = t ß_{0} + k_{0} d_{0} = 30min x 0.65mm/min + 7mm = 26.5mm
Residual thickness of layer 3 = 3526.5 = 8.5mm> 3mm => thickness may be applied. (Photo 2)Due to the changed layer thicknesses, a new stiffness matrix results, which is applied in RFEM for the Extraordinary Combinations with characteristic stiffness values. Design values are calculated for the ultimate limit state (Figure 3). 
Answer
The reason for the different results is probably due to the settings of the effective lengths for the stability analysis. According to the default setting, they are determined automatically in the RF/CONCRETE Columns addon module. However, this method does not work for separate members and no stability analysis is performed (a corresponding warning message appears).If the effective lengths have been entered manually, they only apply to the single member. To perform a correct stability analysis for the column as an entire structural component, it has to be defined as a set of members. 
Answer
In principle, it is also possible to perform detailed analysis in RF‑LAMINATE. In the case of a very high shear distortion, for example, it can be reasonable to use orthotropic solids for modeling. The video shows a simple modeling and result evaluation of a layer structure by using solids.
A criterion, as of when is the modeling using solids useful, is the shear correction factor. Further information and other criteria can be found in the following FAQ:

Answer
The easiest way to consider this is to use the RF‑/JOINTS Timber  Steel to Timber addon module. For this purpose, the module decomposes the original connection, and creates a new structural system that considers the flexibility accordingly. In this case, the ultimate limit state, the serviceability limit state, and the accidental design situation are considered separately. 
Answer
This is not possible directly in RFEM, but the RF‑/STEEL EC3 addon module allows you to create a list of steel parts. In Details of the addon module, you can specify whether the parts list should apply to all members or only for members to be designed. Then, you can simply carry out the calculation and the parts list will be displayed. It is also possible to export the parts list to Excel and further edit it. 
Answer
In order to display the loads correctly, it is necessary to make some adjustments. In the case of an incrementally applied load, the boundary of the area load plane may only be defined in sections (by load increment). Otherwise, the load is distributed linearly over the entire area load plane. 
Answer
The result display of intermediate values is generally linked to the member division property. Also, member loads defined in sections in RFEM generate further intermediate results. For example, if a member load defined in sections is distributed from the member start to the member end, the intermediate results are obtained at the member end nodes.

Answer
In the Dlubal programs, all values are stored internally based on SI units. When a user changes the units in the program to metric or imperial, SI units are still used internally and only the value displayed in the interface is modified. Therefore, all values set in the time diagram function also default to SI units unless the user clarifies an alternative unit.
Let's look at a simple example shown in Figure 1 where the parameter x = 1 ft has been set in RFEM.In RFDYNAM PRO  Forced Vibrations, the time diagram function is defined as k(t) = 1*x where 1 is the multiplier (1/ft) to convert x to a dimensionless value. You can see in Figure 2, because all values default to SI units, the Multiplier column produces values of 0.305 instead of the correct value of 1.000.In order to correct the issue, the user only needs to specify the units of the multiplier as (1/ft) in the function equation. This can be done with the formula modification k(t) = 1/1[ft]*x as shown in Figure 3. Notice the Multiplier column now shows the correct values of 1.000.In summary, when using units in the program other than SI units, coefficients or multipliers in the time diagram function should be accompanied with alternative units defined in brackets. 
Answer
The Poisson's ratio is set under the material by using the Edit Material dialog box. 
Answer
The force V_{L} is the longitudinal shear force between the top surface and the member. It is calculated as an integrated shear flow between the plate and the member at a particular point on the member.For the simplified example provided here, the resulting crosssection values for the integration width of 10 cm are as follows: $I_y=\frac{b\times h^3}{12}=\frac{10 cm\times20 cm^3}{12}=6,666.67 cm^4$
 $S_y=h_1\times b\times((he_z)\frac{h_2}2)=10 cm\times10 cm\times((20 cm10 cm)\frac{10 cm}2)=500 cm^3$
 $\tau=V_L=\frac{V_z\times S_y}{I_y\times b}=\frac{5.53 kN\times500 cm^3}{6,666.67 cm^4}=0.415 kN/cm=41.5 kN/m$
The integration width has been set to the total of 10 cm.Values: I_{y} second moment of area
 S_{y} statical moment
 h_{1} height of the upper crosssection part
 h_{2} height of the lower crosssection part
 e_{z} centroidal distance
 h total height
The values can be adjusted for a Tbeam.
Contact us
Did you find your question?
If not, contact us via our free email, 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 standalone 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. ”