FAQ 004635 | Which types of glued-laminated beams can be calculated with a raised dry joint?

In current literature, the formulas used to determine internal forces and deformations manually are usually specified without considering the shear deformation. The deformations resulting from shear force are often underestimated in timber construction in particular.

Long-span glued-laminated beams are usually supported by a reinforced concrete column with torsional restraints.

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.

In RX-TIMBER Glued-Laminated Beam, the following calculation settings are available:

• Design of ULS, SLS, and/or fire resistance
  • Selection of designs to be performed
  • Determination of displaying support forces and deformations
  • Adjusting the recommended limit values for the deformation analyses
  • Definition of parameters for the fire resistance design performed according to the simplified method (optionally for F 30‑B, F 60‑B, F 90‑B, and user‑defined)
  • Determination of tilting moment for pinned support
• Definition of support conditions for a beam
• Beam optimization by means of:
  • Beam depth modification
  • Modification of beam scene
  • cross-section width
  • Spacing of lateral supports

After the calculation, the results of performed designs, including all required intermediate values, are displayed in clearly arranged result tables sorted by various criteria.

Since the program displays the intermediate values in detail, the transparency of all designs is ensured. It is possible to display the distribution of internal forces for each x-location of the beam in a separate graphical window. Here, both the deformations and the individual internal forces can be displayed.

Designs with design details and selected result diagrams can be added in the printout report, providing clearly arranged documentation. The printout report can include graphics, descriptions, drawings, and more. Moreover, it is possible to select which calculation data will be covered in the printout.

There are various options available for beam modeling. Graphical representations facilitate the geometry input. Modifications are updated automatically. Deflection of cantilevers can be set in the serviceability limit state design, independently of the deflection in the span.

The relevant timber grade of the material can be selected from the material library. All material grades specified in EN 1995-1-1: 2004 (EC 5) or DIN 1052:2008-12 and the selected National Annex are available for glulam, hardwood, and softwood timber. Furthermore, it is possible to generate a strength class with user-defined material properties in order to extend the library. Permanent loads (for example, roof structure) can also be entered using the comprehensive and extensible material library.

Generators integrated in RX-TIMBER Purlin allow for convenient generation of various wind and snow load cases. Load cases are displayed graphically and superimposed in automatically generated load combinations according to EN 1990, DIN 1055-100, or DIN 1052. This way, the required input data are reduced to a minimum. However, you can enter load specifications manually as well.