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Introduction

The internal forces, which are used for design and checks of concrete members can be different as internal forces calculated from FEM analysis. The differences may be caused by:

• for compression member (column)
  • taken into account eccentricities caused by imperfections
  • taken into account second order eccentricity

• for beams and beams as slab

  • taken into account additional tensile forces caused by shear and torsion (shifting of bending moments)

. The following preconditions are used for calculation :

• The shifting of bending moments is taken into account only for beams and beams as slab and in both directions
• The second order effect and geometrical imperfection are calculated only for column in compression
• Cross-section with one polygon and one material is taken into account for calculation second order effect and imperfection in version SCIA Engineer 15
• The material of all reinforcement bars have to be same in SCIA Engineer 15

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