# Knowledge Base

#### Why Dlubal Software?

• More than 45,000 users in 95 countries
• One software package for all application areas
• Free support provided by experienced engineers
• Short learning time and intuitive handling
• Excellent price/performance ratio
• Flexible modular concept, extensible according to your needs
• Proven software used in many well-known projects

#### 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.

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• ## Nonlinear Calculation of a Floor Slab Made of Steel Fiber Reinforced Concrete in the Serviceability Limit State with RFEM

Describing the procedure for the serviceability limit state design of a floor slab made of steel fiber reinforced concrete. This article shows how to perform the corresponding design for the SLS by means of the iteratively determined FEA results.

• ## Nonlinear Calculation of a Floor Slab Made of Steel Fiber Reinforced Concrete in the Ultimate Limit State with RFEM

Steel fiber reinforced concrete is nowadays mainly used for industrial floors or hall floors, for foundation plates with low loads, basement walls and basement floors. Since the publication of the first guideline by the German Committee for Reinforced Concrete (DAfStb) about steel fiber reinforced concrete in 2010, the structural engineer can use standards for the design of the composite material steel fiber reinforced concrete, which makes the use of fiber reinforced concrete increasingly popular in construction. This article describes the nonlinear calculation of a foundation plate made of steel fiber reinforced concrete in the ultimate limit state with the FEA software RFEM.

• ## Calculating Timber Panel Walls | 3 Floor Plan

This article shows the effect of the different stiffnesses of the timber panel walls on the floor plan.

• ## Comparing the Stability Analysis of a Column Containing Internal Forces from Load Combinations with an Enveloping Result Combination

This example will show what you should consider when you perform column design for bending and compression with regard to the internal forces from load combinations and result combinations.

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

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.

• ## Iterative RFEM Calculation with Load Increments

The calculation in RFEM is usually carried out in several calculation steps, the so-called iterations. It is then possible to consider particular characteristics of the model such as objects with nonlinear functions. In addition, by using the iterative calculation, nonlinear effects are taken into account which result from changes in deformation and internal forces in case of the second-order analysis or when considering large deformations (cable theory). In case of complex models, geometric linear calculations are usually not sufficient.

• ## Differences of Calculation Methods in Structural Analysis

For structural dimensioning according to the valid rules, there are often several options or calculation methods to determine the internal forces. It is up to the engineer to decide which theory is suitable to design the structure.

• ## Setting National Annex as Default

If you want to design structural components in an RFEM or RSTAB add‑on module, there are several National Annexes available in some add‑on modules. In the case of structures, which are to be analysed mainly according to a specific National Annex, the add‑on modules provide the option to set a default value. Thus, it is not necessary to select the NA again for each new model.

• ## Keeping Local Iteration Conditions

If there are nonlinearities used in a model, for example contact solids, an error message may appear at the end of the calculation due to the locally unfulfilled convergence criteria. The reason for this is that the convergence of the global iteration conditions is governing in the calculation.

• ## Calculation Diagrams

To record and display a relation between various calculation results, it is possible to use the calculation diagrams. You can create and display them using the “Calculation Parameters” dialog box available under “Calculation” → “Calculation Parameters”.

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