Strut-and-Tie Model

BSM+

The BSM+ programme generates strut-and-tie models for the design of reinforced concrete components. Right-angled structures with any number of re-entrant corners as well as recesses can be calculated. In the first version of the programme, the focus is on generating stiffness-optimised strut-and-tie models with a given component geometry and load.

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System
  • Entry of right-angled structures
  • Thin plates (walls) with openings
  • Most variable concentrated supports with rigid or free supporting conditions
Loading
  • Vertical and horizontal loads from concentrated loads
  • Internal conversion of line loads and trapezoidal loads into resulting concentrated loads
Material

Concrete of all strength classes (C 12/15 to C 90/105) specified by the standard


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Dateiformate
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Output profiles
  • Short
  • Detailed
  • Custom
Import options

FRILO XML

Export options
  • Word
  • PDF
  • FRILO XML

DIN EN 1995:2013

Basis of calculation

The basis of the calculation is a topology optimisation algorithm based on the so-called ground structure method. This method consists in finding a maximally stiff frame with as few members as possible.

Verification/quality criteria

Verification of the following quality criteria in the determination process of the strut-and-tie model:

  • Crossing compression struts – in this case the strut-and-tie model becomes invalid
  • Verification of acute angles between compression and tension struts according to the strut-and-tie modelling theory by Schlaich/Schäfer
Design

In the current version, the design and the reinforcement layout are not available yet. All member forces with the resulting horizontal and vertical load components can be put out.