Steel
All structural steel hot rolled sections Onesteel grade 300 and all plate elements over 16mm thick for 280MPa loads Welded connections have a 6mm continuous fillet weld All bolts are M20 high strength. No connections has less than 2M16 8.8/S bolts and bolts are galvanised Ends of all hollow sections sealed Purlins are cold roleld zinc coated high strength steel with min. yield stress of 450MPa Lysaght or Stramit Cleat plates are used to connect beams onto the precast concrete panel. They are often bolted to the beam and welded to cast plate in panels. Fire protection is as follows: Remove surface contaminants, rust and scale by abrasive blasting to AS1627.4 Class 2.5. Apply One (1) coat zinc phosphate primer dry film 70-90 microns (or Two (2) coats 35 microns each). Subframing includes fascia support made up of 50x50x5.0 EA and a 8mm thick cleat plate (to attach OR2 by). Cleat plate is bolted to purlins and then welded to cleat plate welded to OR2 (89x89x6 SHS) which is welded to cast plate RJB-CP2. 6mm CFW is used all around RB2 20mm diameter rod Universal wind bracing is used with support from roof purlins at midspans
Precast Concrete Walls
Rebate to accomodate first floor slab Exposed concrete finish with cladding Edges are chamfered during production to avoid damagePacker below panel on footing to even out the surface keeping the panel straight Precast connection plates are used to join the panels 1/N16 perimeter bar to all edges with 400mm min laps at corners or projections Min 40 MPa compressive strength after 28 days with normal weight structural concrete, normal weight course aggregate and normal weight fine aggregate
First Floor Slab
Post tensioned floor slab 40MPa on 1mm condek for spanning purposes IBB4 is a concrete beam 450mm deep accomodated by side rebates in precat conrete panels and housing postensioning cables and reinforcement. N12-200 CRS around perimeter 500mm long N16 ferrules at mid depth of beam 500mm long N16 ferrules at top and bottom of beam Beam is setdown by 230mm Concrete cover over condek is top internal and bottom internal: 25mm Post tensioning wire: 7x 12.7 or 15.2mm 24 hours after slab is poured, jacking of tensioning wire comences This section includes top stressing pand and live end anchorages from which the wires are tnesioned
Detailing
First floor external cladding around windows: Aluminium composite cladding with reflective sarking behind supported on the subframing by metal stripping Moisture ingress protection: Window sill flashing extends from under window onto overhang, features a lip to stop capillary movement back into building. Weap holes are also included int he brick work to release vapour build up between brick veneer and stud framing (sarking). Precast concrete panels clad in aluminium composite cladding Window frames are powder coated
Concrete Ground Floor Slab
Reinforcment should lap in slab at 225 laps and in beams at 500 laps Reinforcment is supported by low bar chairs for bottom bars and high chairs for top bars, both sitting on dishes to prevent puncturing of the waterproof membrane. Bar chair located at 1200mm CRS max in both directions Waterproof membrane is to be lapped by 200mm with joins taped and penetrations sealed. Ligatures used to keep top and bottom layers of reinforcement in place in strip footings EB1 extends deeper to account for the rebate and loading of brick veneer wall at WG17 Precast panels joined to slab with N16-400 dowels cast in side of slab by 120mmwhich slot into cast ferrules in panel. N12-200 deformed bars extends into edge beam horizontally to each other to resist tipping moments
Ceilings
50mm Pretensioned corregated duct in panel slots ontovertical N20 bar cast into slab
Celing heights differ according to where services are run Ground floor ceiling height at class room : 3600, at window: 3300 First floor ceiling height at class room: 3000, at window: 3600 Ceiling constructed of timber lining and 10mm flush plasterboard
Footings
Geotechnical report recommends the use of pad and strip footings (350 / 300 kPa respectively) Massing concrete (unreinforced) to be poured under all strip footings to extend depth to weathered siltstone
Masonry
Non-structural masonry - brick veneer wall concealing stud frame. Grade 15 blockwork Nominal proportions of mortar 1:1:6 cement:lime:sand Ties and weep holes included Wall is supported by exteded EB1 below with rebate Machine made pre-cast concrete units with sharp arrises, free from distortion, cracks and other defects, uniform in colour and texture.
Site Works and Foundations
Bore hole 4: Unstable clayey sandey fill until 1m, weathered siltstone from 1m No water found but soil found to be very reactive to moisture following prolonged periods of rainfall. Stripping of the site and compacting the sub soil clay layer is necessary Angle of repose of fill is 45 degrees affecting the proximity of beam trenches to other works.
F1 has N12-200 CRS bottom in both directions F2 has SL81 at bottom EB1 has 3-L-12-TM top and bottom IB1 has 3-L-12-TM top and bottom Bored Piers to be utilised to facilitate the angle of influenece on the retaining wall on other side of building and to reduce load on geothermal piers throughout building. To allow for 450kPa at end bearing (min 2000mm) With beams at the same level as pad footings (IB1), reinforcement continues through the pad footing Order of footings is as follows: natural fill, compacted fill in 150mm layers to achieve floor level, polystyrene insulation/sacrificial formwork (100mm), 0.2mm polythene waterproofing layer, large and small barchairs to facilitate top and bottom reinforcement, SL92 mesh top and SL92 mesh bottom, 2N12 above piers(to increse resistance against bending moments of slab, 150mm thick concrete slab with min 20mm cover depending on bearing load. Line of influence extends from bottom of footing at a 45 degree angle into the foundations. Bored piers takes this load further down and distributes it lower into the foundations