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Luciano Tosini STRAINS, Paris, France

Software craftsmanship in the built environnement. Towards a fully digital modelling of steel structural joints at ULS. Luciano Tosini STRAINS, Paris, France. Structural joints design at ULS Analytical code based formula when possible Loss of the “physical” sense

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Luciano Tosini STRAINS, Paris, France

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  1. Software craftsmanship in the built environnement Towards a fully digital modelling of steel structural joints at ULS Luciano TosiniSTRAINS, Paris, France

  2. Structural joints design at ULS • Analytical code based formula when possible • Loss of the “physical” sense • Loss of the digital workflow • Finite element model, with non linear behaviour • Time consuming • Computation problems

  3. Something old: limit analysis Hypotheses: • All materials have reached their limit (cf. criterion) • All materials allow ductility Codes use the concepts of limit analysis: • Definition of yield lines • Failure mechanisms

  4. What is limit analysis?

  5. A simple method to evaluate p

  6. Something new: digital methods • Interior point algorithms to solve optimisation problems • Cloud Computing • 3D Modelling in a web browser

  7. Preliminary examples fixed M Plates S235 IPE200, S275 IPE200, S275 tp=8mm tp=15mm

  8. Preliminary examples (tp=15mm) fy Staticapproach fy ULS Plastic resisting moment: Lowerbound : Mpl = 64,40 kN.m Upperbound : Mpl = 64,62 kN.m Kinematicapproach: ruinmechanism and plastic zones

  9. Preliminary examples (tp=8mm) Staticapproach ULS Plastic resisting moment: Lowerbound : Mpl = 40,64 kN.m Upperbound : Mpl = 48,84 kN.m Kinematicapproach: ruinmechanism and plastic zones Plastic « hinges »

  10. Footbridges examples: an arch base

  11. Footbridges examples: an arch base ELU 3D Load ULS Capacity ULS Load Final mesh (2) Init mesh (0)

  12. Footbridges examples: an arch base Staticapproach Kinematicapproach 3D stress state Yield lines

  13. Footbridges examples: welded I on CHS ULS Capacity ULS Load Final mesh (2) Init mesh (0)

  14. Footbridges examples: welded I on CHS Staticapproach (VM in Mpa) Kinematicapproach

  15. Footbridges examples: support of a box girder ULS Capacity ULS Load Final mesh (1) Init mesh (0)

  16. Footbridges examples: support of a box girder Staticapproach (VM in Mpa) Kinematicapproach

  17. Conclusion/Cultivate debate… • Next brick? • Reinforced concrete… • How this method compatible with codes? • Why do we need new methods for structural analysis?

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