Aluminium code check (esaad.01)

 

esaad.01

The Aluminium Code Check module is a powerful module for design of aluminium structures. Specific checks are integrated according to the latest European standards (EN1999). In line with the “cold formed steel module” both section and stability checks are supported; the reduced effective section properties due to local and distortional buckling are taken into account.

The program supports safety factors and coefficients that are significance to structural analysis and design. Simple design, fast assessment, detailed calculation report and clear drawings. Further more the stability behaviour (e.g. buckling) depending on other factors like HAZ (heath affected zones) is integrated in Scia Engineer.

Highlights
Integrated solution
Conforms to the general application user interface
Initial and reduced shapes, including integrated cross-section classification tool
Wide variety of open and closed cross-section can be analysed for localized buckling effects

Standard section types are available in the profile library (e.g. Sigma, C etc.). Furthermore, the custumer has the possibility to define cross section in term of centerlines and thickness. Besides the integrated drawing tools, cross sections can be imported from .dxf and .dwg files.

 
The stability behavior (e.g. buckling) depends on other factors like HAZ (heath affected zones), transversal welding etc. is integrated in Scia Engineer.
Checks are performed according with the Eurocode (EN1999) and a detailed calculation note includes all used formulas, tables and references.
The AutoDesign functionality makes possible to optimize the dimensions of the section in order to obtain the optimal design.
Global optimizations features in Scia Engineer considerably reduces the time in the modelling part ( e.g. time needed for selecting suitable profiles for all members in a structure) and during calculation and analysis (e.g. the cross-section routine to determine the maximum allowable unity check threshold and selection of the profile according by the user input)

Benefits

  • Wide variety of sections can be analysed for localized buckling effects.
  • Detailed analysis of effective section increases productivity and requires very limited user input.
  • The obtain effective section can be displayed graphically.
  • Localised transverse welds can be inputted, the extend of the HAZ is calculated and compared to the least width of cross-section.
  • Using the obtained general cross section Editor ( included module esa.07) it is possible to define custom cross-section in terms of centerlines and thickness.
  • Code check per member or per selection of a group of members eliminates potentially long calculation runs for large model, consisting also of parts made of other materials.
  • Explicit settings for lateral-torsional buckling – buckling length, position of load, effective length factor, LTB restrains, HAZ (heath affected zones) factor.
  • The degree of utilization of each cross-section is expressed by color coding the unity check diagrams (over-dimensioned parts, section that fulfil the checks and under-dimensioned are displayed). Color coding makes easy for the user to visually assess the outcome design.
  • The Engineering Report gathers all steps of structural analysis and design – the modelled geometry, internal forces and deformations, the performed section and stability checks, etc.

Summary of performed checks

  • Classification for cross section: for each intermediary section, the classification is determined and the proper checks are performed
  • Reduced cross-section properties are calculated with the appropriate reduction factor for local buckling, distortional buckling and HAZ effect
  • Section checks for:
    • Normal forces (tension/ compression)
    • Bending moment
    • Shear forces (dependent on slenderness of the cross section parts, in addition the shear area is dependent on the cross section type)
    • Torsion
    • Section warping in I-, U-, S- sections
    • Combination of load effect (axial force + bending moments + shear force)
  • Stability checks
    • Flexural buckling for axial loaded element
    • Torsional (-flexural buckling) for axial loaded element
    • Lateral torsional buckling for loaded in bending
    • Combined bending and axial compression
    • Shear buckling and effect of lateral forces for elements loaded in shear
  • Scaffolding member couplers ( included module esasd.13.01)
  • Lateral Torsional Buckling 2nd order analysis (LTB II) ( included module esasd.14)
    • Eigenvalue analysis for the determination of Mcr
    • 2nd order analysis - according to code (elastic/plastic)

Thanks to single check within SCIA Engineer the document style (table composer) is supported and through the single check the user has direct access to the member buckling data and buckling coefficients.

Special considerations aluminium frame design

  • Design for static and dynamic loads
  • Straight and curved girder design
  • Automatic calculation of k-factors and P-Delta factors

Supported cross section

  • Symmetric and asymmetric sections (hot-rolled, welded and cold formed)
  • Rectangular and circular hollow sections
  • Angles, U -, T-, C-, S- sections
  • Section with haunches
  • General section with arbitrary shape
  • Thin-walled geometry, initial shape used for effective section calculation. In fact initial shape for general cross-section can be define by using "Thin-walled representation"; several types of thin-walled cross-section parts can be defined by the user (F-fixed part, I-Internal cross-section part, SO-Symmetrical Outstand, UO-unsymmetrical outstand); parts can also be specified as reinforcement (RI-reinforced internal; RUO-reinforced unsymmetrical outstand).

Regulations background

  • EN 1999-1-1: Design of aluminium structures – General structural rules
  • Actual code version used according with the "Aluminium code check - Theoretical Background".

20/08/2015