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Assessment of Building Structures under Extreme Loading

Explore novel modelling solutions for engineering practice in structures subjected to extreme loading. Developments in computational mechanics, progressive collapse assessment, and integrated building responses. Discover solutions for connection failure, slab mechanics, and masonry structures under extreme loading. Research ongoing projects focusing on building robustness and material rate sensitivity influence.

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Assessment of Building Structures under Extreme Loading

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  1. Assessment of Building Structures under Extreme Loading Bassam A. IzzuddinDepartment of Civil & Environmental Engineering

  2. Buildings under Extreme Loading • Modelling capabilities • Progressive collapse • Ongoing research GEMS 2011 Meeting

  3. Modelling Capabilities • Computational Structural Mechanics Group • 2 academic staff (Izzuddin, Macorini) • 2 RA’s, 8 PhD students • http://www.imperial.ac.uk/csm • Focus on structures subject to extreme loading • Developments in computational mechanics • Applied structural engineering research • Novel modelling solutions for engineering practice • Development of advanced program ADAPTIC GEMS 2011 Meeting

  4. Modelling CapabilitiesADAPTIC • Advanced structural analysis program developed at Imperial College over past 20 years • Blast, fire, earthquake and extreme static loading • Steel, reinforced concrete and composite structures • Whole building response: frame, slabs, walls, connections,… • Geometric and material nonlinearity • Robust and efficient solution procedures • Modelling of large scale structures using HPC GEMS 2011 Meeting

  5. Modelling CapabilitiesSimplified Methods • Framework for progressive collapse assessment • Steel beams subject to fire and blast loading • Steel/composite beams with partial strength connections • Membrane action in slabs • Influence of material rate sensitivity GEMS 2011 Meeting

  6. Modelling CapabilitiesIntegrated Building Response • Frame/slab substructure under sudden column loss GEMS 2011 Meeting

  7. Modelling CapabilitiesIntegrated Building Response • Composite (ribbed) floor slab system under fire GEMS 2011 Meeting

  8. Modelling CapabilitiesConnection Failure • Detailed connection models with/without rate effect GEMS 2011 Meeting

  9. Modelling CapabilitiesSlab failure • Mechanics-based models for slabs subject to membrane action and reinforcement rupture GEMS 2011 Meeting

  10. Modelling CapabilitiesMasonry Structures • Material model • 3D Mesoscale model • FE modelling • Multi-scale modelling of masonry structures under extreme loading Wpl1 GEMS 2011 Meeting

  11. Modelling CapabilitiesPartitioned Modelling on HPC • Hierarchic partitioned approach for targeted model refinement and parallelisation on HPC GEMS 2011 Meeting

  12. Progressive Collapse AssessmentDesign-Oriented Framework • Robustness limit state • Prevention of collapse of upper floors • Stretching design envelope from strength to ductility limit • Two stages of assessment • Nonlinear static response accounting for ductility limit • Simplified dynamic assessment GEMS 2011 Meeting

  13. Progressive Collapse AssessmentDesign-Oriented Framework • Maximum gravity load sustained under sudden column loss • Multi-level framework • Reduced model where deformation is concentrated • Columns can resist re-distributed load • Floors identical in components and loading • Planar effects are neglected GEMS 2011 Meeting

  14. Progressive Collapse AssessmentNonlinear Static Response • Need models beyond conventional strength limit, including hardening, tensile catenary and compressive arching actions • Sudden column loss similar to sudden application of gravity load to structure without column • Maximum dynamic response can be approximated using amplified static loading (ld P) GEMS 2011 Meeting

  15. Progressive Collapse AssessmentSimplified Dynamic Approach • Based on conservation of energy • Work done by suddenly applied load equal to internal energy stored • Leads to maximum dynamic displacement (also to load dynamic amplification) • Definition of “pseudo-static” response GEMS 2011 Meeting

  16. Ongoing Research Projects • Robustness of composite buildings under localised fire (EU project: Liege, Imperial, Coimbra, …) • Influence of material rate sensitivity on building robustness (Imperial, Trento) • Keeping our structures standing and our people alive – The next 25 years (DHS project: Texas, Imperial, PEC, WPM) GEMS 2011 Meeting

  17. Ongoing Research ProjectsDHS Project • Testing of 3D floor systems to failure under column loss GEMS 2011 Meeting

  18. Ongoing Research ProjectsDHS Project • Sudden column loss vs blast damage • Column loss is an upper bound thus useful for design Sudden column loss GEMS 2011 Meeting

  19. Ongoing Research ProjectsDHS Project • Significance of uplift under external blast GEMS 2011 Meeting

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