Structural Steel - OneSteel

More documents

Recommendations

Info

300PLUS ®BHP Billiton CentreThe column-free floor plate of thebase building allowed the fit outdesign by Woods Bagot to incorporatea continuous subdivision modulethat allows all work point types tobe interchangeable across the spaceand throughout the tenancy.“The side core creates an uninterruptedeast/west length in the building. Byproviding a central community zone withan inter-tenancy stair, the building waseffectively divided in two. The enormouslength of the building is managed by acombination of angled corridors brokenat intervals with points of interest andnatural light throughout,” Ms Kay said.The final base building plan, with itslarge column-free internal space andsymmetrical layout, facilitated asophisticated flexible and efficient fit-outdesign creating maximum light andbrightness within.The 45 metre long reinforced concreteeccentric jump-formed service core is thelongest to be jumped in one operation onan Australian building site.This service core supports 18.3 metreOneSteel 300PLUS ® Welded Beams, clearspanning from the walls of the core tothe perimeter of the building.These beams, in turn, support a 120 mmthick un-propped composite slab onprofiled steel decking which was laidunder the fabricator’s contract. The shearstuds were welded to the top flanges ofthe beams on site, also under thefabricator’s contract along with the 2,700tonnes of structural steelwork.Innovative long span floor framing and aneccentrically located side service core delivereda highly flexible, column free workspace.The 47,500 square metres of profiledsteel decking used on the buildingincorporated a blue anti-glare coating.This was the first time this newAustralian invention had been usedin the world.Nat Bonacci of The Bonacci Groupcommented that “BHP Billiton setstringent deflection levels, similar tothose more commonly used for beams of10 metre span. To meet these levels thebeams on the BHP Billiton tenancy floorswere OneSteel 300PLUS ® 800WB122,while those for the remaining officelevels were typically 300PLUS ®700WB115.”Nat Bonacci went on to say: “For efficientrouting of air-conditioning and otherservices, the floor beams were providedwith standardised notched cut-outs ateach end that reduced the beam depth toabout half, and were reinforced withrelatively inexpensive stiffening. Wherecut-outs were necessary at some otherlocations, they were generally able to becircular, and of a diameter and locationsuch that they did not need stiffening.”In addition, the time taken to erect an 18metre structural steel floor beam was lessthan an 18 metre concrete beam, whichrequires a greater volume of concrete,and longer pouring time, also contributedto a faster construction program.The concrete encased steel columnsaround the perimeter of the building,incorporated OneSteel 300PLUS ®200UC46 erection columns, which wereable to support one level of steelworkand construction load above the level ofconcrete encasement.Concrete column encasement around theends of the beams falling on the columngrids were poured at the same time asthe slab concrete to ensure deflectioncharacteristics of those beams under theweight of the wet floor slab were similarto the beams not on the column grid.FURTHER COST & TIMESAVING INITIATIVESAt tender stage Grocon asked steelfabricator, Alfasi Steel Constructions andtheir nominated supplier of OneSteelproducts, to explore ways of furtherreducing the cost and construction time.The collaboration between Alfasi andtheir steel distributor reduced thehandling of the many hundreds of steelbeams by eliminating delivery from thewarehouse of the steel distributor to thefabricator’s shop prior to transport to site.onesteel solutions issue 5 page 14
300PLUS ®BHP Billiton CentreThe steel distributor provided the beamscut-to-length and cambered, and with allthe necessary penetrations, copes andbolt holes. To reduce handling theyprovided a temporary fenced-off area forthe Alfasi crews to carry out fabricationwork, welding the necessary fitments andstiffeners to the beams, prior to directdelivery to site.Furthermore, because sealed windowswere used and the air-conditioningsystem kept out moisture, the structuralsteel framing did not need painting.This meant the cost of painting and theextra associated costs of handling andtransporting the steelwork to the paintshop were saved.Ricky Hains, Director of PlanIt DesignGroup, oversaw the steel detailing for theproject carried out by his staff in theAlfasi fabrication workshop. Thisarrangement facilitated communicationbetween the fabricator and the detailerand enabled prompt resolution of issuesas they arose.A 3-D model was created and DXF fileswere used to directly control profilecutting and order lists for the profiledsteel decking and the special foldedangle edge-form were also produced bythe software.FIRE ENGINEERINGA fire engineering study for the project,carried out by Arup Fire, determined thatonly the floor beams above the two retaillevels were required to be sprayed withan appropriate fire-protective coating.Those above the office and carparklevels, by far the greater proportionof the building, used bare steel beamsutilising the inherent fire resistance of300PLUS ® steel.Tony O’Meagher of Arup Fire said that:“This assessment was based on theperformance of similar types ofcomposite building frames in full scalefire tests with office fuel loads.Enhancing the sprinkler system toincrease its reliability reduced thelikelihood of a major fire developing. Theanalysis of the structure also determinedthat the size and strength of the concreteencased steel columns was sufficient tomaintain their structural stability duringand after a fire.”One of the many benefits ofthe composite system is thatit did not require propping,providing for fasterconstruction and anun-cluttered workingenvironment.onesteel solutions issue 5 page 15
Page 5 and 6: Splitting on corner radiiIN FABRICA
Page 7 and 8: INTERVIEWRichard BarrettWith nearly
Page 9 and 10: 300PLUS ®Suncorp StadiumSuncorp St
Page 11 and 12: 300PLUS ®Suncorp StadiumGreat team
Page 13: 300PLUS ®BHP Billiton CentreThe BH
Page 18: 300PLUS ®Erina Ice WorldErina Ice
Page 22: 300PLUS ® Tempus Two Winery Visual

Structural Steel - OneSteel

Create successful ePaper yourself

Delete template?

Save as template?