OneSteel Solutions 6.pdf

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300PLUS ®Biztek Brookvale NSWBiztek – Fire Safety EngineeringSolution enabled Bare SteelConstruction.The composite steel floor framing typicallyconsists of <strong>OneSteel</strong>’s 300PLUS ® 530UB82universal beams as primary members spanningapproximately eight metres with 300PLUS ®310UB40 universal beams as secondary beamsat third points on the primary beams.The floor-to-floor height is 3.6 metres.Mechanical services for the building were runthrough penetrations that had been pre-cutthrough the floor beams.The long street frontage is broken by twocourtyard voids defined by strong steel beambracing, shaped in an elongated crossconstructed from <strong>OneSteel</strong>’s 300PLUS ®200UC46 universal column sections.“As a design team we decided that thebest, most cost effective material toachieve the architectural requirementsfor the upper floors would be to usestructural steel in combination with thestructural decking slabs and concretetilt-up wall panels for the three wallsnot facing the road.”“In combination with the top downconstruction this presented the builderwith a number of attractive options tominimise construction time.By utilising composite construction ofsteel and concrete the structural steelsizes could be minimised.”“In combination with the top downconstruction this presented the builderwith a number of attractive options tominimise construction time. By utilisingcomposite construction of steel andconcrete the structural steel sizes couldbe minimised.”This in turn led to a significant reductionin the extent of substructure andgeotechnical works to the site, and theassociated timeframe for these works –when compared with traditional concreteconstruction“Once structural steel had been adoptedfor the framing of the upper floors itbecame apparent that a number ofeconomies could be achieved due tothe simplicity of building with steel,”Ray Kusturin said.To save construction time, the large twostorey basement car park was built afterthe upper structure.The above ground structure of the firesafety engineered, unprotected steel(see boxed text) was prefabricated off-site.At the same time preliminary excavationwas started and perimeter curtain pilingwas commenced to contain the groundwater, without the need for ground anchors.Once the ground water dam was in placeone metre diameter piles were thenbored at the column locations and steelstanchions lowered into the wet concrete.Next the post-tensioned ground floortransfer slab was laid on top of the onemetre diameter piles. At the same time,the superstructure was being erected andfitted out above the transfer slab whilethe basement was excavated to its fulldepth, the low strength concrete scrapedoff the steel column supports and anintermediate basement floor was poured.This way the critical path through theconstruction process, which was theexcavation and construction of awaterlogged basement, was bypassed.Mike Berkery, Project Manager of BeremIndustrial, the builders on the projectsaid that: “Once we got the tilt-up panelserected the steel structure just flew up.“We used relatively simple connectionsfor the steel to concrete panels and wewere able to work on a number of frontssimultaneously.”“Because the super-structure wasconstructed of structural steel it waspossible to install the unpropped deckingsteel formwork system at the same timeas the structural steel which saved moretime. The shear studs were stud weldedon site through the pan and erection ofthe roof sheeting was completed prior topouring the 150mm thick slab.”Gian Callegaro, Universal SteelConstructions’ Manager who fabricatedthe job, reinforced Berkery’s commentssaying: ”The simple connection designadopted by the design team madefabrication of the structural steel veryeasy. This simple but extremely efficientapproach to steel design also hadbenefits when erecting the structure.onesteel solutions issue 6 page 12
300PLUS ®BHP Billiton CentreAs the main supporting columns werecontinuous from the ground floor allthe way up to the roof, we were ableto complete two floors plus the roofsimultaneously. Once the southern partof the structure was erected, we wereable to immediately start laying thestructural decking as well as roofsheeting.”“The site constraints and the E shapedesign meant that the perimeter steelwas erected and completed and thenthe centre section of the buildingerected in stages. We worked fromground to roof from the rear of thebuilding out to the road.”The exposed steelwork has beenprotected with inorganic zinc silicateand top-coated with a Ferreko finish.The fire engineering study found that thedesign benefits to the project included:OWNEROrlani PropertyGroupARCHITECTNordon JagoArchitects Pty LtdENGINEERHenry and HymasBUILDERBerem ConstructionsSTEEL FABRICATORUniversal SteelConstructions(Australia) Pty LtdSTEEL DETAILERJem Drafting ServicePty LtdBiztek is a steel showcase designedas a stimulating and harmonious workenvironment with ample parking. Theproject was efficiently designed andbuilt in structural steel employing aclever construction technique toovercome the site constrictions forthe basement levels.Homes Fire & Safety undertook afire-safety engineering study andadopted an unprotected steel primarystructural system for the building. BevenJones from Homes Fire & Safety saidthat: “The study looked at the variouscollapse mechanisms exhibited by steelexposed to fire and the performance ofstructural steel in a sprinkler protectedbuilding, with consideration of sprinklerredundancy. The design utilised theinherent fire resistance of steel,protection afforded by proprietarynon-fire-rated inter-tenancy walls andnatural separation provided by thebuilding design to achieve anacceptable structural system.• Compartmentalisation locales thepossibility of structural collapse to asmall portion of the building in theevent that the sprinkler system failsto control a fire within a tenancy• Services were able to be run throughthe steel framing in prefabricatedholes without affecting the fireresisting performance of the element• Vertical separation was provided bythe floor slabs accompanied by thesprinkler system, which in turnprovided lateral restraint to theunprotected columns• Structural beams are containedwithin concealed ceiling spaces ofnon-combustible linings where theyare protected from direct flameimpingement and radiant heat fluxexposure during the early stagesof a fire• Sprinkler protection allowed shopfronts to be full height glazing withminimal obtrusion by the structuralsystem• No proprietary fire rated systemswere required to protect thestructural system, therebysignificantly reducing costs andtime associated with the labourintensive task of fire rating structuralelements• The provision of sprinkler protectionallowed full height glazing to theshop fronts with minimal obtrusionby the structural system• The unprotected steel structureformed a major part of the externaland internal architecture of thebuildingFIRE ENGINEERINGHolmes Fire andSafety LimitedPHOTOGRAPHYAnthony FretwellEric Sierensonesteel solutions issue 6 page 13
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