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OFF SITE CONSTRUCTION Dr. Ruth Collins TrinityHaus

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Presentation on theme: "OFF SITE CONSTRUCTION Dr. Ruth Collins TrinityHaus"— Presentation transcript:

1 OFF SITE CONSTRUCTION Dr. Ruth Collins TrinityHaus

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?


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