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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 to the program features.
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Calculating Timber Panel Walls | 1. Determining the Ultimate Limit State and Stiffness
The stiffening of timber structures is usually carried out by means of timber panels. For this purpose, structural components consisting of slabs (chipboards, OSB) are connected with members. Several articles will describe the basics of this construction method and the calculation in the RFEM program. This first article describes the basic determination of the stiffnesses as well as the calculation.
Internal Forces Diagram/Surface Stresses - Smoothing Options
The deformations of the FE nodes are always the first result of an FE calculation. Based on these deformations and the stiffness of the elements, it is possible to calculate strains, internal forces, and stresses.
Modeling Approaches for Shear/Hole Bearing Connections by Means of FEAFor more detailed investigations of shear/hole bearing connections or their immediate environment, the definition of the non-linear contact problem plays an important role. This article uses a solid model to search for comparable and simplified surface models.
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.
Documenting Graphical Results of Reinforcement in RF-CONCRETE SurfacesRFEM offers different options to display results graphically which have been determined in RF-CONCRETE Surfaces. This article gives an overview of these options.
Considering End Releases Between SurfacesThis paper explains the consideration of compliance between surfaces using line joints and line releases. Line joints and line shares take into account compliances between areas. Examples of this are joints in reinforced concrete construction or corner joints in cross-laminated timber construction.
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.
Modeling and Bending Design of Point-Supported Flat SlabThis article describes how a flat slab is generated as 2D model in RFEM and the loading is applied according to Eurocode 1.
Modeling of Semi-Rigid Composite Beam Made of Timber as Surface ModelThere are several options to calculate a semi-rigid composite beam. They differ primarily in the type of modeling. Whereas the Gamma method ensures a simple modeling, additional efforts are required when using other methods (e.g. shear analogy) for the modeling which are, however, offset by the much more flexible application compared to the Gamma method.
FEM Modeling Approaches of Rigid ConnectionsEspecially when the adjacent area of connection points should be analyzed, the geometry or load of the connection does not correspond to the standard specifications and/or a structure should be analyzed with an FE model (for example in plant engineering), it is necessary to evaluate the connections in detail on the FE model.
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