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Useful Program Features
The Knowledge Base includes technical articles on a wide array of structural analysis and design topics.
These articles are intended to help you navigate through the Dlubal programs, learn efficient tips and tricks, and provide further insight into the program features.
Why Dlubal Software?
Load Combinations in Timber Structures for European and American Timber Standards
In addition to determine loads, there are some particularities concerning the load combinatorics in timber design which have to be considered. Contrary to steel structures where the largest loading results from all unfavorable actions, in timber construction, the strength values are dependent on the load duration and the timber humidity. Special characteristics have to be considered as well for the serviceability limit state design. The following article discusses the effects on the design of wooden elements and how this is possible with RSTAB and RFEM.
Modeling Joints as Surface ModelWith RF-/FRAME-JOINT Pro, it is possible to design frame joints according to DIN 18800 or Eurocode 3. When considering non-standardized joints or taking a closer look at the joint and its behavior, it is recommended to use a modeling as surface model. The following article will show how such a model is created in principle.
Influence of Slip of Standardized Joints in Steel StructuresThis article deals with the stiffness of standardized joints according to the DSTV (German Steel Construction Association)/DASt (German Committee for Structural Steelwork) standards, often used in steel construction, and its effects on structural analysis and design results according to DIN EN 1993-1-1.
Fin Plate Connections: Theory and ApplicationFin plate connections are a popular form of pinned steel connections and are commonly used for secondary beams in steel structures. They can be easily used in beam structures arranged on the top edge, e.g. working platforms. Manufacturing expenditures in the workshop as well as the assembly costs on-site are normally manageable. The design seems to be completed easily and quickly, but has to be put into perspective to a certain extent in the following. Moreover, this connection type is basically possible as pinned beam to beam or pinned beam to column connection, whereas the first case is the more common one in design practice.
Modelling and Design of Pinned End Plate ConnectionRFEM offers the following possibilities to design a pinned end plate connection. Firstly, there is the possibility in RF-JOINTS Steel - Pinned to enter the corresponding parameters quickly and easily to receive a documented analysis including graphics. It is also possible to model such a connection individually in RFEM and then to evaluate or manually design the results. In the following example, the particularities of this modelling will be explained and the shear forces of the bolts will be compared to the corresponding results from RF-JOINTS Steel - Pinned.
Forces by Screw in Main-Connected Beam Joint
RF-/JOINTS Timber - Timber to Timber allows you to design main-connected beam joints. This article explains the determination of forces in screws of a beam connected to a torsionally rigid main beam.
Tension Connections in RF-/JOINTS Timber - Steel to Timber
In the case of tension connections with cleats subjected to unilateral loading, the external members (side timber) are loaded by an additional bending moment due to the eccentric load distribution. However, this fact is not mentioned in EN 1995‑1‑1 and is considered in the National Annex to DIN EN 1995‑1‑1 by the reduction of the tensile strength. This reduction depends on the pull‑off strength of the fasteners.
DXF Export of Connection Geometry
Since the last update of RFEM/RSTAB, you can export the entire connection geometry in the DXF file format from RF‑/JOINTS. This is possible for all connection groups, both steel and timber. You can start the export in the “Results - Graphic” window by clicking the new button below the graphics window.
Joint Types in RF-/JOINTS Timber - Steel to Timber
The joint type ‘Main member only’ in RF‑/JOINTS Timber - Steel to Timber can also be applied for more than one connected member. This is particularly useful in the case of very complex connection geometry of connected members. For this type, the number of connected members is unlimited.
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