# 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
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• 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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• ## Stability analysis of a purlin with I-section without fork support

This technical article deals with the stability analysis of a roof purlin, which is connected without stiffening by means of a screw connection on the lower flange in the sense of a minimum manufacturing effort.

• ## Increased Yield Strength According to EN 1993-1-3, 3.2.2 (3)

According to clause 3.2.2, EN 1993-1-3 allows the use of an average increased yield strength fya of a cross-section due to strain hardening.

• ## Steel Frame Considering Connection Stiffness

This technical article analyzes the effects of the connection stiffness on the determination of internal forces as well as the design of connections using the example of a two-story, double-spanned steel frame.

• ## Rib Transformation Into Surface Model With Result Beam Using VBA

If a rib is part of a nonlinear design or is rigidly connected to following walls, a surface should be used for the modeling instead of a member. So that the rib can still be designed as a member, a result member with the correct eccentricity is required, which transforms the surface internal forces into member internal forces.

• ## Lateral-torsional buckling in timber structures | Examples 1

In the article Lateral-Torsional Buckling in Timber Structures | Theory explains the theoretical background for the analytical determination of the critical bending moment Mcrit or the critical bending stress σcrit for the tilting of a bending beam. The following article uses examples to verify the analytical solution with the result from the eigenvalue analysis.

• ## Wind Comfort in Pedestrian Areas and Around Buildings

Buildings are structures surrounded by wind. The flow around it creates specific loads on the surfaces, which are to be used for the design in structural analysis.

• ## 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.

• ## Fire Resistance Design of a Column Under Axial Force

In this technical article, a hinged column with a centrally acting axial force will be designed by means of the RF-/STEEL EC3 add-on module according to EN 1993-1-2. We will use the National Annex of Germany here.

• ## Timber Column Design per the 2018 NDS Standard

Using the RF-TIMBER AWC module, timber column design is possible according to the 2018 NDS standard ASD method. Accurately calculating timber member compressive capacity and adjustment factors is important for safety considerations and design. The following article will verify the maximum critical buckling in RF-TIMBER AWC using step-by-step analytical equations per the NDS 2018 standard including the compressive adjustment factors, adjusted compressive design value, and final design ratio.

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