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From page 10
“
This project showcases how flexible Ultra-Span LSF steel is .”
– Uwe Schlüter , MiTek
flexible Ultra-Span LSF steel is and how it makes it possible to design and erect a complex roof safely , cost-effectively and on time .”
He adds that this is only possible if the contracting company has the requisite skills . “ In this regard , I must commend EcoStruct ’ s Jacques Cloete who designed this structure on the MiTek 20 / 20 roof design and engineering software with full 3D resolution , which certainly helped to achieve all the complex curves and roof lines ,” Schlüter says . The result is an extremely lightweight 3 250m ² roof structure using only 8.7kg / m ² of LSF sections , roll-formed using ArcelorMittal ’ s high strength galvanised steel sheet . This means a total mass of just 28.3 tons of LSF was used for the entire roof structure .
John Barnard , Southern African Light Steel Frame Building Association ( Sasfa ) director , says that one of the keys to this project is the assembly of ‘ clusters of trusses ’ on the ground , which significantly increase the safety of the process . The process was quicker as the trusses were lifted by a mobile crane with a long reach . “ The combination of low mass , safety and speed translates into costeffectiveness ,” he says .
To achieve this , EcoStrut used a 160-ton mobile crane with a long reach capability , enabled the erector to lift simultaneously five pre-assembled braced roof truss clusters into the final position . “ Therefore , it took only one day to lift all 46 trusses of the main roof into position therefore greatly reducing the total time spent on site ,” Barnard says .
The mobile crane used to erect pre-assembled braced roof trusses .
The material was light which translates into a smaller mass for the entire structure . www . ecostrut . co . za A team that had the requisite skills helped to successfully complete the project .
12 RESIDENTIAL
MAY 2018