XFEM4U Analysis

Calculation settings

Analysis

You can choose between two types of analysis: Geometric non-linear (GNL) or Geometric linear (GL). When you have chosen for a check according to the Eurocode (timber and steel), the analysis is always Geometric non-linear (GNL).

Dead weight

You can choose if you want the dead weight to be automatically generated or not.

Gravity acceleration g

Gravity acceleration in m/s2.

Code check

Design working life

The design working life of the construction in years

Consequence class

The consequence class of the construction. This determines among other things, the load factors that need to be used.

National Annex

The national annex can be chosen by land.

Steel code

The steel code you want to use

Imperfections

It can be set whether you want to take imperfections into account or not.

m

is the number of columns in a row including only those columns which carry a vertical load NEd not less than 50% of the average value of the column in the vertical plane considered

See Eurocode EN 1993-1-1 art. 5.3.2 Imperfections for global analysis of frames. In XFEM4U all node coordinates will automatically be corrected/adjusted with +dx and -dx. So all UGT combinations will be automatically calculated twice. One with imperfections in positive direction, and one with imperfections in negative direction. Furthermore, in XFEM4U all Eurocode design checks are based on a geometrically non-linear analysis. Imperfections (initial sway imperfections) will be automatically included in calculating load combination(s). This is a very accurate calculation method and is applicable for every type of frame. Sway or braced/non-sway frames. In addition, there is no need to calculate (error-prone) buckling lengths any more. The geometrical non- linear analysis (Second-order analysis) ensures global buckling stability check.

In XFEM4U global initial sway imperfections according to EN 1993-1-1 art. 5.3.2 (3) a) are taken into account automatically. The beam imperfections according to EN 1993-1-1 art. 5.3.2 (3) b) are NOT taken into account. This means that the individual stability of all beams needs to be checked according 6.3. The buckling length can be assumed equal to its beam length since the calculation is based on analysis, including global second order effects and global imperfections. See EN 1993-1-1 art. 5.2.2 (7) b).

Concrete code

The concrete code you want to use

Partial fixity

Specific for concrete setting if partial fixity should be taken into account.

Timber code

The timber code you want to use