# Knowledge Base

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1. ## Designing End Plate Connection of Hollow Sections Under Tension According to the CIDECT Method and by Means of the FEM Model

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A site joint consisting of hollow sections with end plates will be designed. It is the bottom chord of a truss which has to be divided for transport reasons.

2. ## Differences Between the Analytical and Nonlinear Deformation Analysis of Reinforced Concrete

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Different methods are available for calculating the deformation in the cracked state. RFEM provides an analytical method according to DIN EN 1992-1-1 7.4.3 and a physical-nonlinear analysis. Both methods have different features and can be more or less suitable depending on the circumstances. This article will give an overview of the two calculation methods.

3. ## Calculating Timber Panel Walls | 1. Determining the Ultimate Limit State and Stiffness

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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.

4. ## Internal Forces Diagram/Surface Stresses - Smoothing Options

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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.

5. ## Modelling Approaches for Shear/Hole Bearing Connections by Means of FEA

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For 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.
6. ## Load Combinations in Timber Structures for European and American Timber Standards

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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.

7. ## Documenting Graphical Results of Reinforcement in RF-CONCRETE Surfaces

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RFEM offers different options to display results graphically which have been determined in RF-CONCRETE Surfaces. This article gives an overview of these options.
8. ## Considering End Releases Between Surfaces

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This article deals with considering end releases between surfaces with line hinges and line releases. Examples are joints in reinforced concrete structures or frame joints in cross-laminated timber structures.
9. ## Modeling Joints as Surface Model

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With 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.
10. ## Modeling and Bending Design of Point-Supported Flat Slab

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This article describes how a flat slab is generated as 2D model in RFEM and the loading is applied according to Eurocode 1.

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