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OFF SITE CONSTRUCTION

OFF SITE CONSTRUCTION

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OFF SITE CONSTRUCTION

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  1. OFF SITE CONSTRUCTION Dr. Ruth Collins TrinityHaus ruth.collins@tcd.ie

  2. OFF SITE CONSTRUCTION RE-CAP TYPES OF MODULAR CONSTRUCTION • Modular/POD Method • Panelised System • Infill Panels • Hybrid Construction

  3. OFF SITE CONSTRUCTION RE-CAP WHY CHOOSE EACH METHOD • Modular/POD Method • Need for fast construction • Regular shapes • Need for internal finishes to be done off site

  4. OFF SITE CONSTRUCTION RE-CAP WHY CHOOSE EACH METHOD • Panelised System • Need for Fast Construction • Large Open Space • Irregular Shapes

  5. OFF SITE CONSTRUCTION RE-CAP WHY CHOOSE EACH METHOD • Infill Panels • Multi-Storey Design • Hybrid Construction • Shear core required for services • More economical to use more than 1 method • Architectural Considerations etc.

  6. OFF SITE CONSTRUCTION LIGHT GAUGE STEEL COMPONENTS • Load Bearing Walls • Non-Load Bearing Walls or Partitions • Floors • Roof Trusses

  7. OFF SITE CONSTRUCTION LIGHT GAUGE STEEL ADVANTAGES • Dry Building Material • Not susceptible to moisture or movement • High Tolerances • High Precision Production of Profiles • Lengths cut within 2mm tolerance • Strength to Weight Ratio very high • Environmental Benefits • 100% recyclable • Flexibility in Size and Design

  8. OFF SITE CONSTRUCTION LIGHT GAUGE STEEL COMPONENTS • Hot Dipped Galvanised • Cold Rolled Steel • Load Bearing Wall Depth, 70mm to 200mm • Non-Load Bearing Wall Depth, 70mm to 100mm • Floor depth, 200mm to 350mm • Roof Trusses, 90mm U-Chord Section

  9. OFF SITE CONSTRUCTION LIGHT GAUGE STEEL COMPONENTS • Stud and Track

  10. OFF SITE CONSTRUCTION LIGHT GAUGE STEEL COMPONENTS • Stud and Track

  11. OFF SITE CONSTRUCTION LIGHT GAUGE STEEL COMPONENTS • Back to Back Stud

  12. OFF SITE CONSTRUCTION LIGHT GAUGE STEEL COMPONENTS • Boxed Stud

  13. OFF SITE CONSTRUCTION DESIGN CONSIDERATIONS • Structural Requirements • Resist Gravity and Lateral Loads • Other Physical Requirements • Depth of Required Insulation • Interface Details i.e. type of cladding, amount of glazing etc • Architectural Requirements • Depth of the window reveal • Floor spans • Handling and Erection Conditions

  14. OFF SITE CONSTRUCTION STRUCTURAL DESIGN • Gravity Loads • Wall studs must be aligned with the floor joists • Lateral Loads • Cross Bracing • K-Bracing • Sheathing Board • Openings • Avoid lines of high vertical load • Ensure lintel is strong enough to transfer load • Provide strength either side of the opening to transfer load

  15. OFF SITE CONSTRUCTION STRUCTURAL DESIGN (cont...) • Floor to Floor Dimensions i.e. height • Floor Zones and Spans • Section size depends on floor span • For large spans a lattice floor may be required • Building Height • For practical purposes, limit to 4-6 storeys • Progressive Collapse • Inter-connectivity between walls and floors

  16. OFF SITE CONSTRUCTION OTHER DESIGN CONSIDERATIONS • Acoustics • Fire Resistance • Thermal Insulation • Durability • Environmental Performance

  17. OFF SITE CONSTRUCTION EFFECTIVE WIDTH • Effective width is a function of: • Boundary conditions • Stress conditions • Material • Width to thickness ratio etc • Stress distribution vs cross section property • Iterative process

  18. OFF SITE CONSTRUCTION EFFECTIVE SECTION PROPERTY • Cee Section

  19. OFF SITE CONSTRUCTION EFFECTIVE SECTION PROPERTY • Lipped Section

  20. OFF SITE CONSTRUCTION EFFECTIVE SECTION PROPERTY • Back to Back Section

  21. OFF SITE CONSTRUCTION EFFECTIVE SECTION PROPERTY • Boxed Section

  22. OFF SITE CONSTRUCTION DESIGN EXAMPLE OF LIPPED SECTION

  23. OFF SITE CONSTRUCTION FIRE • Requirements vary according to height • Protected by layers of plasterboard • Staggered layers and importance of detailing • Allowed temperature of the steel • Cavity Barriers and Connections • Testing

  24. OFF SITE CONSTRUCTION ACOUSTICS • Mass • Absorption • Distance Between Layers • Stiffness • Resilience • Detailing for acoustic breaks and flanking transmission

  25. OFF SITE CONSTRUCTION ACOUSTICS

  26. OFF SITE CONSTRUCTION ACOUSTICS

  27. OFF SITE CONSTRUCTION THERMAL PERFORMANCE • Thermal performance depends on • Thermal performance of the building envelope • Ventilation rate and form of construction • Air leakages • External climate • Internal gains

  28. OFF SITE CONSTRUCTION THERMAL PERFORMANCE • Thermal performance of building envelope • Depends on position of steel studs • Insulation Type • Insulation Thickness • Insulation Placement • Wall Penetrations • Thermal Bridging

  29. OFF SITE CONSTRUCTION THERMAL PERFORMANCE • The ‘Warm Frame’ Approach

  30. OFF SITE CONSTRUCTION THERMAL PERFORMANCE • Air Tightness • No point in placing lots of insulation if there are lots of air leaks letting all the hot air escape • Comes back to detailing

  31. OFF SITE CONSTRUCTION THERMAL PERFORMANCE • General Guidance • Maximise the stud spacing • Minimise the stud steel thickness • Use ‘warm frame’ construction • Minimise cold bridging at openings and joints • Provide air tight seal around the building envelope

  32. OFF SITE CONSTRUCTION DURABILITY • Light Gauge Steel protected by Galvanised Coating • Must look at all components regarding durability • Insulation materials • Claddings • Fixings etc…

  33. OFF SITE CONSTRUCTION ENVIRONMENTAL PERFORMANCE • Steel is 100% recyclable • Light gauge steel companies use recycled steel • Risk of moisture problems reduced • Efficiency of Production – Little Waste • High Quality – Little Waste • Light weight – Transport more at one time • Components can be re-used

  34. OFF SITE CONSTRUCTION USING OFF SITE CONSTRUCTION FOR CONSTRUCTION INNOVATION?