NUIG New Engineering Building Lecture 2

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Presentation to the 3rd & 4th Year Civil Engineering Students in NUIG on the New Engineering Building

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NUIG New Engineering Building Lecture 2

  1. 1. Presenter Cian O’Donnchadha BEng CEng MIEI MIStrutE4th Year Civil Engineering Arup Consulting Engineers 5th March 2010 NUIG School of Engineering Wexford Opera House
  2. 2. Presentation Overview • Structural Development • Precast Concrete – Voided Slab • Precast Concrete – Beams and Double T Units • Site Progress – August 2009 to November 2009 • Fairfaced Concrete • Site Progress – Weather • Site Progress – Dec 2009 to March 2010NUIG School of EngineeringWexford Opera House
  3. 3. Structural DevelopmentNUIG School of EngineeringWexford Opera House
  4. 4. KEY STRUCTURAL CHOICE CRITERIA Architectural Issues at scheme stage– Grid • An initial planning grid of 1.5 m • A west wing width of 18.0 m and an east wing width of 11.0 metres. • A grid spacing along the building edge of 7.5 m • A notional building height of 4 storeys was assumed at concept stage. • Central Bay 30m long West Wing – Structural Grids 4.5m Span + 9.0m Span + 4.5m Span 2 No 9.0m Spans 3 No 6.0m SpansNUIG School of EngineeringWexford Opera House
  5. 5. Other Factors Influencing Structural Choice In addition to the usual issues of cost and programme we have also considered issues such as adaptability, flexibility, partition systems, weights (foundation loads) etc. Site Disruption: •Amount of traffic into and out of site. •Nuisance caused by construction process (Noise, Vibration, Dust etc) •Equipment associated with the construction process. •Neighbour issues Adaptability: •Capacity for future service penetrations (both vertical and horizontal). •Ease of insertion or removal of stairs, lifts, floors. •Response to changes in loading requirements or capacity for late Client Changes. Services: •Ease of services integration. Flat soffits or limited steel beam depths are ideal. Can primary and secondary service runs follow beam/downstand layouts? •Are there problems associated with vertical ductwork. •Ease of addition of future services Procurement: •Lead in times and any effect on design programme/design freeze.NUIG School of EngineeringWexford Opera House
  6. 6. Buildability: •Achievement of good tolerances/good fit. •Sensitivity to weather conditions. •Lack of reliance on temporary works and following work (cleanliness) Cladding: •Ease of base and head fixings. Stiffness and stability provided by base structure. Soffit Quality: •This covers soffit treatment. Solutions such as precast slabs may require only painting, steel frames may require suspended ceilings. This will also have an effect on thermal issues. Partitions: •Ease of base and head fixings, flat soffit allows for easier and quicker installation. •Does the structural grid tie in with planning grid? Thermal: •Effect of structure mass on diurnal temperature fluctuations within building. •Ability to cool and heat a structure out of hours (night time cooling). •Ribbed soffits have more exposed area and are more efficient than flat soffitsNUIG School of EngineeringWexford Opera House
  7. 7. Depth: •Influence of slab depth on services and building envelope. Sound/Acoustics: •Influence of structure mass and soffit on sound/acoustic characteristics Speed: •Influence of structural system on construction programme. •Early weather tightness and optimisation of following trades. Stability: •Lateral stability, ease of provision and effect on programme. •Construction of insitu concrete core walls may be on critical path. Foundations: •Influence on total building weight and thus on foundations. Limitations on pile numbers and rate of piling. Cost: •Overall cost (including effects of time). Fast construction may have higher cost for construction. Shorter overall construction programme may give lower total cost if cost of money is allowed for.NUIG School of EngineeringWexford Opera House
  8. 8. Scheme workshop with RMJM architectsNUIG School of EngineeringWexford Opera House
  9. 9. Models of different Structural SolutionsNUIG School of EngineeringWexford Opera House
  10. 10. Choice of Material Insitu Concrete Construction Advantages Disadvantages •Increased thermal mass, particularly with ribbed •An exposed concrete soffit can be expensive when forms of construction. producing a high quality finish. (Costs may be offset against suspended ceiling costs). •With flat slab construction, detailing of partitioning •With the use of post tensioned concrete a limited systems is simple number of contractors are available (2-3). •On a 7.5 m grid, good cladding support with •A heavier form of construction (compared to steel), minimal deflection. which can result in an increase in foundation costs. •On long span particularly post tensioned, vibration •In general with insitu construction there is more and deflection can be more easily controlled disruption to the site due to the construction process compared to steel (Concrete deliveries etc) •Easier to accommodate changes to elements/details •Longer site period compared to steel. at a later stage •Shallower form of construction compared to steel. •Short lead in, 6 – 8 weeksNUIG School of EngineeringWexford Opera House
  11. 11. Choice of Material Precast Concrete Construction Advantages Disadvantages •Prestressed units control deflection, vibration and •Not ideally suited to a 2 way spanning system. cracking. •High quality finish can be part of a factory-produced •Lead in times are comparable with steel (12 – 14 product. weeks). •Exposed concrete aids thermal mass particularly if •Joints/details need careful attention and early ribbed. resolution. •If a high quality frame is required, only 2 –3 •Good for one-way spanning systems. contractors can supply a satisfactory product.NUIG School of EngineeringWexford Opera House
  12. 12. Choice of Material Steel Frame Construction Advantages Disadvantages •Speed on site. •Long span options tend to experience vibrations and deflection problems. •Procurement – good range of locally available •Unless structure and slab is exposed (with the subcontractors resulting industrial type finish), little thermal mass advantages are gained. •Minimal site disruption. •With the fabrication drawing and manufacture programme, an earlier design freeze is required. •Lightest form of construction generally. •Late alterations are more difficult to accommodate. •Cladding support may cause problems on long spans. •A deeper form of construction, in many cases adding to the overall building height as compared to other alternatives. •Lead in of 12-14 weeks required (from drawings to steel on site).NUIG School of EngineeringWexford Opera House
  13. 13. Options for the West and East Wing The West Wing 8 structural options have been developed on the basis of the 2 structural grids as highlighted •Grid Type A 14.0m span •Grid Type B 2No. x 7.75m spansNUIG School of EngineeringWexford Opera House
  14. 14. The following 8 options were investigated in the West Wing Option 1: Voided Flat Slab (Grid Type A). Option 2: Composite Concrete Wide Slab onto Cellular Beams (Grid Type A). Option 3: Post-Tensioned Concrete Rib Slab (Grid Type A). Option 4: Hollowcore Precast Floor and Steel Beams (Grid Type A). Option 5: Voided Concrete Flat Slab (Grid Type B). Option 6: Composite Concrete Wide Slab onto Steel Beams (Grid Type B). Option 7: Steel Metal Deck (Grid Type B). Option 8: In-Situ Flat Slab (Grid Type B).NUIG School of EngineeringWexford Opera House
  15. 15. Option 1: Voided Flat Slab (Grid Type A). Advantages for a two-way precast soffit system Disadvantages (Voided Slab) reinforced •High quality, steel mould finish ready to paint. •Long lead in 12-14 weeks. •Shallower form of construction compared to •Expensive. traditional insitu concrete. •Good fire resistance / Acoustics •Limited specialist Sub-contractor (2). •Good thermally. •Not previously used in UK or Ireland (European). •Good for partition head/base fixings. •Openings restricted to central areas. •Slim and lighter form of construction due to plastic void former. •Once on site quick installation.NUIG School of EngineeringWexford Opera House
  16. 16. Insitu Flat Slab Composite Steel Frame and metal decking Precast beams and Precast coffered slabsNUIG School of EngineeringWexford Opera House
  17. 17. Precast Concrete Voided Slab NUIG School of EngineeringWexford Opera House
  18. 18. Oran Precast, Oranmore, Co Galway NUIG School of Engineering Wexford Opera House
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  31. 31. Precast Concrete Beams & Double T units NUIG School of EngineeringWexford Opera House
  32. 32. Banagher Concrete, Banagher , Co Offaly NUIG School of Engineering Wexford Opera House
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  40. 40. Site Progress Photographs – Aug 2009 to Nov 2010NUIG School of EngineeringWexford Opera House
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  44. 44. Excavation & ReplacementNUIG School of EngineeringWexford Opera House
  45. 45. Piling Operations – Set OutNUIG School of EngineeringWexford Opera House
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  57. 57. Concrete – Fairfaced Concrete NUIG School of Engineering Wexford Opera House
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  71. 71. Site Progress – Weather NUIG School of EngineeringWexford Opera House
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  81. 81. Site Progress – November 2009 to March 2010 NUIG School of EngineeringWexford Opera House
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