BiaxialCrack software

Biaxial bending resistance of generic section with crack width calculation

BiaxialCrack is one of the most advance tool developed by STRUANG. It allows the biaxial bending calculation of complex and generic composite sections with crack width calculation. Starting from a section CAD file (.dxf) is possible to define the reinforcement, all the embedded profiles and the openings through the concrete. BiaxialCrack studies the section uscing finite elements defining high level mesh. The software can be used for generic composite material. The current version has been written mainly for composite concrete/steel elements. After the calculation an excel report can be exported with all the relevant results.

Brief description

Software purpose
The Biaxialcrack software is used for analysis and verification of a generic reinforced concrete section.

Scope of application
The Biaxialcrack software is very practical for every day design work. It allows different analysis for a generic reinforced concrete section which may comprises irregular geometry of the concrete area, openings with genric geometry as well, user defined arrangement of the reinforcement rebars and embedded steel profiles.

Method of analysis and design checks

On the basis of a definition of section geometry directly from CAD drawings, materials and forces, the program allows ULS and SLS resistance and stress calculation.
The Biaxial software uses elasto plastic linear behaviour for concrete and reinforcement as defined in EC2.
For each ULS combination, it evaluates:
- Bending moment curvature diagram for biaxial in tensile or compression regime
- Interaction resistance domain N Mx and My varying number of characteristic sections
- Non linear stress analysis
- Unlimited number of combinations
For each SLS combination, it evaluates:
- Linear stress analysis considering tensile contribution of concrete
- Linear stress analysis without considering tensile contribution of concrete
- Crack width calculation based on 7.3.4 EN 1992-1-1
- Unlimited number of combinations

The software stands out because it allows:

- Any type of section geometry (rectanglular, poligonal, circular) based on CAD drawing
- Any type of openings with generic geometry
- For rebars
  - No limitation in terms of number of rebar
  - Customisation of rebar diameter
  - Customisation of rebar material properties (i.e. Elastic modulo)
- For embedded profiles
  - Generic section geometry definition based on CAD drawing
  - Customisation of profile material properties (i.e. Elastic modulo)

The current version allows a quick input process based on an excel file.

For crack width calculation, according to EN 1992-1-1:2004 7.3.4, BiaxialCrack considers the following parameters:

1 - For rebars inside tension zone:
    1.1 - Equivalent diameter
    1.2 - Rebar spacing
    1.3 - Cover
    1.4 - Effective rebars area for crack width calculation
2 - User can define k1, k2, k3 and k4
3 - It evaluates if the section is cracked, if it is, it distinguishes two calculation cases based on rebars spacing
4 - It evaluates effective rebar stress inside the tension zone.

Typical cases study are represented by the analysis and verification of RC column, beam and bridge pier section.

The Software Biaxialcrack provides several graphs and diagrams output using Matlab libraries.
Output information consists of
  - Section geometry
  - Section mesh
  - Section solid domain
- Diagrams
  - Steel stress strain
  - Concrete stress stain
  - 3D interaction domain (N Mx My)
  - For each combination:
      2D interaction domain ( N M )
      Moment curvature
      Stress map with Matlab colormap

- Detailed report (Excel format)

  - Assumptions
  - Geometry information (i.e. reinforcement position, Inertia, neutral axis, etc)
  - Crack width calculation details based on 7.3.4 EN 1992-1-1
  - Maximum and minimum stress for each combination
  - 3D interaction domain points for each orientation defined

The program can easly deal with complex reinforced section geometry throught CAD drawing.
The software establishes a consistent section analysis, stress verification and crack width control in accordance with Eurocode 2.
The current version does not carry out any reinforcement optimisation. Current version does not includes post tension which is under construction and will be released with the next version.

Biaxialcrack has been developed in MATLAB by Ing. Alessandro Angelini (STRUANG).
Copyright : STRUANG Ing. Alessandro Angelini Monteleone di Spoleto ITALY.

Preliminary validation test document:


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