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Steel Design

EC3 steel design can both check and auto design your steel members. 

Everything is presented like hand-calculations to make sure, that this is not a 'black box'.

National annexes handled are Danish, Finnish, German, Hungarian, Norwegian, Polish, Rumanian, Swedish, and British.The Steel Design module handles bars and shells in ULS, SLS and fire. It takes you through all Eurocode checks. Steel Design also has the 'clean' Eurocode without national annexes.


1. Steel Bar Design

This is not a black box. All design calculations are presented like hand calculations. → Read more... Easy to follow:

2. Steel Shell Design

Convert your bar element into shells with one click. Add holes etc. Follow the design calculations and create your structural report. Easy. → Read more...

3. Steel Fire Design

FEM-Design checks and designs steel bars for fire effects according to EN 1993-1-2 for nominal fire curves. → Read more...

Design options

Steel members can be verified and designed for fire effects based on (among other parameters) the fire duration, fire curve, and section exposure. FEM-Design allows for auto-design and manual design of steel members.


Auto design

Manual Design

There are two manual design options:

  • Design for fire protection material (from the library or user-defined)
  • Calculate maximum temperature


Steel fire design: Auto Design options

There are two manual design options:

  • Apply chosen fire protection material (from the library or user-defined)
  • Set maximum member temperature


Steel fire design: Manual Design options

Detailed results and documentation

It is possible to display a detailed calculation report for each steel bar, for both protected and unprotected members, for auto- and manual design. That report can be added to the documentation module, or exported to .docx or Mathcad format.

Steel fire design: Detailed results

In the Documentation module, one can display utilization tables containing crucial information regarding fire duration, applied insulation, and utilization before the fire and at fire conditions.

Steel fire design: Utilization table Steel fire design: Combinaed utilization table

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Steel Design Module

Steel Joints Design

FEM-Design checks and designs steel joint according to EN 1993-1-2. Steel Joint is a separate module that is available in two versions: standalone or built-in FEM-Design 3D Structure.


  • Total of 51 solutions and 7 types (according to the Swedish Institute of Steel Construction).
  • Use predefined solutions and design the connection using bolt and/or welds.
  • Define the load and steel sections in the stand-alone version, or get an automatic import of the geometry and load combination results from FEM-Design 3D model.
  • Easy and clear overview of the results and utilizations.
  • Save your solution in a collection for future use.
  • Get documentation of both drawings, but also welds and bolts needed.

Watch the video presentations


Steel Joint: Built-in version

Steel Joint: Standalone version

Webinar: FEM-Design Steel Joint

Steel Joint Stiffness

FEM-Design gives the opportunity to set the rotation stiffness of Steel Joints automatically or manually, and apply it to the structure. The rotational stiffness of semi-rigid joints connecting H and I profiles can be calculated automatically according to methods given in EN 1993-1-8.

Watch the video presentation:


FEM-Design automatically generates documentation for each joint that contains the input data of the joint (Member data, Load combinations, data of all components) and detailed calculations, so-called detailed results. → Read more...

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Steel Design Module

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)


→

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).


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.

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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Steel Design Module

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...

Steel Design Module