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Smart Structural Systems vs. Reliability and Robustness

Smart Structural Systems vs. Reliability and Robustness. Fabio CASCIATI, Lucia Faravelli University of Pavia, Italy Sara Casciati University of Catania at Syracuse, Italy. Outline. Large structures Devices and smartness Design constraints Building a numerical model Optimization?

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Smart Structural Systems vs. Reliability and Robustness

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  1. Smart Structural Systems vs. Reliability and Robustness Fabio CASCIATI, Lucia Faravelli University of Pavia, Italy Sara Casciati University of Catania at Syracuse, Italy

  2. Outline • Large structures • Devices and smartness • Design constraints • Building a numerical model • Optimization? • Conclusions Smart Structural Systems

  3. 2 pairs of cables 2 road decks Rail deck Crossbeams Large structures Smart Structural Systems

  4. The Deck: innovative conception & demanding optimization Feasibility study 1986 Deck unit weight: 38,0 t/m all superstructures: 624,000 t 1990 design Deck unit weight: 22,6 t/m all superstructures: 458,000 t 1992 - 2002 design Deck unit weight: 18,5 t/m all superstructures: 344,000 t Smart Structural Systems

  5. Towers and navigation channel Tower height: 383 m Navigation clearance 65 x 600 m Smart Structural Systems

  6. Smart Structural Systems

  7. Constructive Stages of the Pylon Smart Structural Systems

  8. Evolution of Natural Periods during the Construction Out-of-plane Active/Hybrid strategies In-plane Passive strategies Smart Structural Systems

  9. Devices & Smartness Smart Structural Systems

  10. Smart Structural Systems

  11. Design Constraints • Performance-based design a) Lifetime 200 years b) Return periods: 4000-10000 years SI 2000 years ULS 200 years SLS2 50 years SLS1 • Robustness • Devices obliged to work as passive devices in case of failure of the control. Smart Structural Systems

  12. Building a numerical model • Constraints positive mass and dampers technological constraint, f.i., 0.017 - <0 • Limit States Smart Structural Systems

  13. Limit states • SLE • SLU • Out-of-plane displacement • Device relative displacement • Fatigue Smart Structural Systems

  14. Robustness • Via scenarios of damage: 1 hanger damaged 2 hangers damaged … Smart Structural Systems

  15. Optimization ? • Optimization vs. preliminary design PUT: x design variables C design and construction cost K cost of failure Pfi probability of failure in mode i Irobustness index Smart Structural Systems

  16. Updating after monitoring Smart Structural Systems

  17. Conclusions • The design process is well established, but for some return period values any statistical meaning is lost; • Substructuring is a must: it introduces one of the main component of uncertainty; • Soil-structure and wind-structures interactions represent the other sources of main uncertainty. • Structural control potential is not adequately utilised. THE AUTHORS ARE GRATEFUL TO FABIO GIULIANO FOR THE PREPARATION OF THE TMD SLIDES Smart Structural Systems

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