OneSteel Solutions 6.pdf

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300PLUS ®BEDEV Office DevelopmentBEDEVOFFICE DEVELOPMENTBENEFITSAT A GLANCE• Early occupancyFASTER CONSTRUCTION IN STRUCTURALSTEEL DELIVERS FIRST CLASS OFFICEACCOMMODATION AHEAD OF TIME• Large column free spansto accommodate client’sneeds now and in thefuture• Faster construction by“jump starting” upperfloors• Elimination of proppingfor faster constructionand less site congestion• Fire Safety EngineeringSolution to allow BareSteel Construction• Shallow floors to meetbuilding heightrestrictions• Structural steel mosteconomic optionWhen Built EnvironsDevelopmentsdecided to developthe prime commercialsite on the corner ofFrome and FlindersStreets in Adelaide’sCBD they wanted tocreate an A-gradeoffice building thatwould capitalise onthe tenancy marketfor prestige clients.As the building is the first officefacility to be constructed in the areafor over 10 years the developers neededto maximise utilisation of the site.Located in the eastern precinct of thecity’s CBD the four storey development,with a 32 metre x 42 metre footprint, hasrealised 4650 square metres of rentableoffice space. It is serviced by three liftsand a basement carpark to accommodate37 cars.At the concept stage Built EnvironsDevelopments contracted theirconstruction arm, Built Environs,to project manage and build thedevelopment. The company was advisedthat the fastest and cheapest constructionmethod would be to build in steel. “Theadvice on the cost and time advantage ofsteel came from our consultants andfrom the quantity surveyors, Rider Hunt,”said Nick Emmett of Built Environs.“ the overall cost of the building was reducedand the owner was able to gain occupancyahead of the scheduled completion date”onesteel solutions issue 6 page 14
300PLUS ®BEDEV Office DevelopmentThere was a height restriction of 12metres in the area, which meant that thestructural depth of the floor system wasrestricted to accommodate the threesuspended levels above the ground floorthat were critical to the commercialviability of the project.Matthews Architects were briefed todesign the A-grade office developmentwith open floor plates which wouldincorporate state-of-the-art environmentalfeatures. Carl Reeves, the project architecton the job, originates from the UK where,he said, structural steel construction isthe preferred option on many projectsdue to the increased speed of erectionand the potential to ‘fast track’construction.At the early stage of the project RiderHunt, the architects and the engineers,Meinhardt PT Design, worked with<strong>OneSteel</strong> Market Mills on a steel packagewhich entailed a preliminary design, firesafety engineering assessment and afabrication price which showed that thecomposite steel option was the mostcompetitive system.Because the height of the building wasbelow 25 metres a sprinkler system wasnot required under the deemed-to-satisfyrequirements of the Building Code ofAustralia. However, Mr Reeves said that:“In consultation with the developer it wasdecided that the installation of a sprinklersystem would be in keeping with theA-grade nature of the development andawareness of potential client perceptionson fire safety.” With the incorporation of thesprinkler system throughout the buildinga fire safety engineering solution couldbe adopted as an alternative approachunder the BCA which enabled the use ofbare steel for both beams and columns.Mr Reeves said that essentially thebuilding is a structural steel framed glassclad box that maximises the site. TheFrome Street elevation has an expressedstructure clad in aluminium panels.A series of vertical and horizontalelements break the glass curtain wallfaçade in a pleasing geometric patternwith two balconies one on top of eachother to the north and south elevationsappearing as if they are extruded from thecurtain walling and structure beyond.This division of the Frome Street façadeinto four sections is broken in the centreof the elevation by a two storey recessedentrance, below a CantileveredAluminium Panels Clad Steel FramedCanopy that extends back to the centrallift core forming a notable internalarchitectural feature to the entry foyer.The floor plates on each level encirclethe lift and service core. Two central firestairs are located behind the core in ascissor arrangement offering two meansof escape to the upper floors. Thepermanent formwork for these stairs isalso steel, with each pre-fabricated steelstair being lowered into position duringconstruction as one item and laterin-filled with concrete.Carl Reeves said that: “Because the steelframing could be fabricated offsite anderected as a kit of parts the primarystructural building elements above theground floor were faster to construct.To capitalise on the advantage that thesteel option offered the builder took thedecision to advance the ground floorconstruction over the basement in orderto foreshorten the overall constructionprogramme even further.OWNERBuilt EnvironsDevelopmentsPty LtdARCHITECTMatthews ArchitectsSTRUCTURALENGINEERMeinhardt PT DesignBUILDERBuilt EnvironsSTEEL FABRICATORSamaras StructuralEngineersSTEEL DETAILERSamaras StructuralEngineersFIRE SAFETYENGINEERINGCesare (VUT)BUILDINGCERTIFIERKatnich DoddPHOTOGRAPHYKevin O’DalyThe grid for the building was set at 8.1 metres (typically three-car bayspaces) in one direction and a variable 6 to 9 metre grid in the other.The steel frame is constructed entirety of <strong>OneSteel</strong>’s 300PLUS ®Structural Steel sections.• Primary beams are typically 530UB92.• Secondary beams vary from 360UB45s for the 6m spansto 410UB54s for the 9m spans.• Column range from 150UC23 to 310UC97s depending onthe tributary area supported.onesteel solutions issue 6 page 15
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