Timber Design | National Annexes (NA) to Eurocode 5

Using the Timber Design add-on, 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 strength calculated by the Timber Design add-on using step-by-step analytical equations as per the NDS 2018 standard including the compressive adjustment factors, adjusted compressive design value, and final design ratio.

When calculating regular structures, data input is often not complicated but time-consuming. Input automation can save valuable time. The task described in the present article is to consider the stories of a house as single construction stages. Data is entered using a C# program so that the user does not have to enter the elements of the individual floors manually.

Our webservice offers users the opportunity to communicate with RFEM 6 and RSTAB 9 using various programming languages. Dlubal's high-level functions (HLFs) allow you to expand and simplify the WebService's functionality. In line with RFEM 6 and RSTAB 9, using our WebService makes the engineer's work easier and faster. Check it out now! This tutorial shows you how to use the C# library by means of a simple example.

In RFEM and RSTAB, you can design members with the "Laminated Veneer Lumber" material type. The following manufacturers are available:

• Pollmeier (Baubuche)
• Metsä (Kerto LVL)
• STEICO
• Stora Enso

In the ultimate configuration, you can consider strength coefficients for increasing the strengths. The coefficients reducing the strengths are automatically taken into account regardless of this. Try it now!

Go to Explanatory Video

• A wide range of cross-sections, such as rectangular sections, square sections, T‑sections, circular sections, built-up cross-sections, irregular parametric cross-sections, and many others (suitability for design depends on the selected standard)
• Design of cross-laminated timber (CLT)
• Design of timber-based materials and laminated veneer lumber according to EC 5
• Design of tapered and curved members (design method according to the standard)
• Adjustment of the essential design factors and standard parameters is possible
• Flexibility due to detailed setting options for basis and extent of calculations
• Fast and clear results output for an immediate overview of the result distribution after the design
• Detailed output of the design results and essential formulas (comprehensible and verifiable result path)
• Numerical results clearly arranged in tables and graphical display of the results in the model
• Integration of the output into the RFEM/RSTAB printout report

• Design of tension, compression, bending, shear, torsion, and combined internal forces
• Consideration of a notch
• Design of compression perpendicular to the grain on the end and intermediate supports with (EC 5) and without reinforcement elements (fully threaded screws)
• Optional shear force reduction at the support (see the Product Feature)
• Design of curved and tapered members
• Consideration of higher strengths for similar components that are close together (factor k_sys according to EN 1995‑1‑1, 6.6(1)-(3))
• Option to increase shear resistance for softwood timber according to DIN EN 1995‑1‑1:NA NDP to 6.1.7(2)