STEEL FRAME CONSTRUCTION: DRIVEN BY STEEL: - OneSteel

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300PLUS ® Latitude East @ World Square Designed by leading architects Crone Partners and engineered by Taylor Thomson Whitting (TTW) Latitude East is being developed on the World Square site by Multiplex and follows the three high-rise towers and the Retail Complex completed between September 2002 and May 2006. Construction on this site has presented a number of design challenges, not the least of which has been the pre-existence of the multi-level carpark, loading dock and parts of the retail structure. Multiplex had designed the World Square Retail Complex, over which Latitude East is built, to support a future residential development above. When the feasibility of a major government tenant (the ATO) became a commercial reality, Multiplex realised the layout of the proposed building would have to alter and the columns would have to be strengthened substantially to support the change. Weight, always an issue on the World Square site because of load limitations on the pre-existing multilevel carpark, became even more critical on Latitude East. Steel, as a material able to deliver a 30% lighter building, was the ideal structural solution. The lighter frame greatly reduced the degree to which the existing structure needed to be strengthened. Stephen Boss of Multiplex said that: “The strengthening work would have meant time delays on the project that couldn’t be predicted because of uncertain access to existing retail tenancies. However, a structural steel solution was around 30% lighter so many less columns needed to be strengthened, reducing the uncertain time risks. The steel option allowed Multiplex to improve our risk profile on the project.” Apart from the increased time and cost to strengthen the columns to carry a heavier commercial structure the site had other constraints including: • construction operating times restricted to 7am-7pm weekdays and Saturdays from 7am-5pm • limitation to traffic movements on and off the site • workforce number limitations of the site. OneSteel Solutions issue 8 page 10 Construction work shows the atrium with balustrades to the lower floors in position.
300PLUS ® Latitude East @ World Square Offsite fabrication of the steelwork and a cooperative approach from the steel industry overcame these and other restrictions. TTW carried out the engineering design, including design of the floors to meet structural requirements. Greg Kane, TTW’s Structural Engineer, said that: “There are 12 storeys below the new structure. The first new level (level 13) was built as a transfer deck. From level 14 the construction is composite steel decking with a structural steel frame. Of over 200 existing columns only 30 needed to be strengthened for structural reasons, with a few more modified for architectural motives, greatly reducing the impact on the retail tenancies and to discuss the feasibility of the steel option. These meetings were the genesis of a cooperative coordinated working relationship between Multiplex and the emergent BlueScope Lysaght Design & Construction team which resulted in a win-win outcome for all and substantially reduced Multiplex’s risk profile on the project.” Multiplex contracted BlueScope Lysaght Design & Construction Pty Ltd to manage the steelwork packages, including supply, fabrication and erection of the steel frame and the installation of the steel decking and shear studs. Greg Kane said that: “Erection was very fast. The average deck was on a six-day site-work drilling, surveying, fitting safety barriers and the installation of the curtain wall brackets. We coordinated the work of over 20 suppliers. This approach gave Multiplex a completely integrated delivery of the steelwork and reduced the risks associated with the steel option.” Brent Poll said that the 900 tonnes of steel beams, plus the columns, decking installation and the roof structure, was erected over 11 weeks. The composite beams were designed with OneSteel’s latest CompPanel ® software. Pre-cambers offset the beam self weight and wet concrete deflection to provide a horizontal beam soffit and Erection was very fast. The average deck was on a six-day cycle. We started construction in mid September and had virtually finished the structure by late December. access to the carpark. Only eight new columns were needed.” Chris Mathews, a former Multiplex Construction Manager had worked on the Latitude/Ernest & Young Tower and the Retail Complex with Harry Young (Project Manager) and Stephen Boss of Multiplex. Their combined experience on both projects and Chris Mathews’ association as a consultant to BlueScope Lysaght’s Design & Construction business meant the team was able to sit down and design out a lot of the construction issues on the Latitude East project. Stephen Boss said that: “Chris Mathews bought to the evolving design table OneSteel engineers and the BlueScope Lysaght Design & Construction business cycle. We started construction in mid September and had virtually finished the structure by late December.” Greg attributed the speed of erection to pre-planning. “Once into the construction phase all went smoothly. It went very well largely because of the detailed pre-planning which went into the steelwork. Weekly pre-planning meetings were held between May and August to design out any aspects which might hold up the project.” Brent Poll, Manager of BlueScope Lysaght Design & Construction, said that they put a huge effort into the management of the job. “We took a holistic approach and integrated the design management, the steelwork detailing, fabrication, ancillary formwork, uniform slab thickness. This meant that the slabs could be poured to a level with a uniform thickness resulting in minimal concrete wastage. Site feedback indicated that the pre-cambers specified generally came out as calculated. An oversized pressed metal edge form was used at the edges of the slabs. Extensive interactions between BlueScope Lysaght Design & Construction and TTW generated highly economical connection details. Most of the web side plate (WSP) connections were changed to angle cleat connections. The single angle cleat connections (rather than a WSP) meant many of the primary beams, as well as all the secondary beams could be processed on a beam line by Sebastian Engineering rather than OneSteel Solutions issue 8 page 11
Page 1 and 2: Construction Solutions in Structura
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STEEL FRAME CONSTRUCTION: DRIVEN BY STEEL: - OneSteel

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