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Timber Design

Fast auto design and check are available to find the most suitable timber bar cross-sections and panel types. Based on Eurocode 5 (EN 1995-1-1:2004), load-duration classes can be taken into account in the Timber design. The load-duration classes are characterized by the effect of the constant load acting for a certain period of time in the life of the structure.

       

Timber Design

Fast auto design and check are available to find the most suitable timber bar cross-sections and panel types.

Based on Eurocode 5 (EN 1995-1-1:2004), load-duration classes can be taken into account in the Timber design.
The load-duration classes are characterized by the effect of constant load acting for a certain period of time in the life of the structure.
For a variable action the appropriate class shall be determined on the basis of an estimate of the typical variation of the load with time.
Actions shall be assigned to one of the load-duration classes given for strength and stiffness calculations.

The following design considers EC5 (standard) and the National Annex (NA) for Denmark, Finland, Hungary, Norway, Poland, Rumania and Sweden. With the timber module, arbitrary structures in space can be designed with regard to a 1st order or a 2nd order analysis. In the Code Check all checks prescribed in the codes depending on acting section forces are displayed. → Read more...

 


 

1. Timber Bar Design

The timber bar design tool finds the most suitable cross-section for all timber bars (columns, beams and truss members) based on their initial calculation parameters, internal forces and detailed utilization calculations. Read more about timber bar design on our → Read more...

Fire design for timber bars is now available in FEM-Design. Timber bars can initially be protected from fire exposure by structural elements or fire protective claddings and it’s now possible to consider these effects in FEM-Design. → Read more...

 


 

2. Timber Panel Design

The timber panel design tool finds the most suitable type for all timber panels (plates and walls) based on internal forces and detailed utilization calculations. With Manual design, you can run quick utilization check for given panel types by elements and/or design groups. Read more about Timber panel design on our → Read more...

 

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Timber Design Module

Learn about the most exceptional features of the Timber Design Module in FEM-Design

CLT Panels (Cross-laminated timber)

Analysis of laminated type shell structures is now available with a new mechanical model implemented into FEM-Design 19, based on the laminated shell theory. → Read more...

   

 

 

Timber Design Module

Learn about the most exceptional features of the Timber Design Module in FEM-Design

The Dynamics module include Footfall analysis, Seismic analysis and Stability analysis. 

1. Footfall analysis

This calculation method allows for checking the structure's response for an exciting vibration. The calculation can be started in Analysis/Calculations/Footfall analysis. The settings for the calculation can be found under the Setup.... Here one can select one of the three available methods:

  • Self excitation
  • Full excitation
  • Rhythmic crowd load (Load case shall be selected with this method)

 

→ Read more...

Watch Webinar about Footfall Analysis in FEM-Design.


2. Seismic analysis

FEM-Design offers the seismic analysis in two of its modules: FEM-Design 3D Structure and FEM-Design Frame.

FEM-Design offers the following methods of seismic calculations according to Eurocode 8.

  • Modal response spectrum analysis (“Modal analysis”)  
  • Linear shape method (Static, linear shape)
  • Mode shape method (Static, mode shape)

 

Seismic loads

Seismic loads are taken into account according to the Response Spectrum Analysis method of Eurocode 8 or Turkish seismic code.  Only the response spectrum and some additional parameters have to be defined as Seismic load. Required spectrums can be defined with the Seismic load by using standard spectra (automatic) or by manual definition (unique).

Results

Besides displacements, reactions, connection forces, and internal forces, the program calculates the Equivalent loads and the “Base shear force”. Results can be displayed by vibration shape (selected at calculation settings), from torsional effect, from sums by direction, and from the total sum (Seismic max). If equivalent loads are displayed, also the “base shear force” appears on screen (in grey color). Torsional moment effect on the whole structure can also be displayed, if the torsional effect was taken into consideration during the calculation. → Read more...

Parameters and automatic generation of horizontal spectra

Results of Seismic analysis

Watch Webinar about Seismic analysis in FEM-Design. 


3. Stability analysis

At the description of the second-order theory, it was pointed out that the resultant stiffness of the system depends on the normal force distribution. In case of linear elastic structures the geometrical stiffness matrix is a linear function of normal forces and consequently of loads:

KG (λN) = λ KG 

The structure loses its loadbearing capability if the normal forces decrease the stiffness to zero, i.e. the resultant stiffness matrix becomes singular:

det [K + λ KG (N)] = 0

It is an eigenvalue calculation problem, and the smallest λ eigenvalue is the critical load parameter.

The calculation has to be performed in two steps. First, the normal forces of the elements have to be calculated by using the K matrix. In the second step KG and the λ parameter can be determined. The critical load is the product of the load and the λ parameter. The above-mentioned eigenvalue problem is solved by the so-called Lanczos method in FEM-Design. The results of the calculations are as many buckling shapes as the user required and the matching λ critical load parameters.

In the example below, the eH value of the first shape is 89%, which means it is probably a global buckling shape with horizontal displacement. Displaying the result (see the leftmost inset above) and examining the buckling shape shows that this is indeed a case of global buckling with the horizontal displacement of the frame’s top. The same structure’s second shape possesses a very high rZ value (99%), meaning this almost certainly is a global torsional buckling shape (shown in the middle inset). The fourth shape’s eH, eV and rZ values are significantly lower, which implies it is a local buckling shape. As the rightmost inset shows, the assumption was correct (local buckling of both columns). → Read more...

Stability analysis - column buckling

Watch a basic course on Stability Analysis in FEM-Design

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Timber Design Module

Learn about the most exceptional features of the Timber Design Module in FEM-Design

Documentation in FEM-Design

This chapter summarizes the documentation possibilities of FEM-Design projects, models and results. It introduces the printing and listing (summary tables) functions and the automatic documentation based on templates (Documentation module). → Read more...

Timber Design Module

Learn about the most exceptional features of the Timber Design Module in FEM-Design