Blackheath Road, Phase 2 Rodgers Leask Ltd 43 Friends Road Croydon CR0 1ED London United Kingdom Tel.: +44 2086048721 Fax: +44 2086048722 Contact: M. David Wadsworth Email: [email protected] Rodgers leask Ltd was established nearly 20 years ago by John Rodgers and Andy Leask and now stands at 46 technical and administrative staff. Annual turnover is £1.6 million. Andy and John are still very much at the helm and are overseeing a period of steady growth of the practice with the assistance of three new directors. The practice offers services over the whole range of civil, environmental, and structural engineering commissions ranging from modest one off domestic projects to multi million pound major redevelopments and structures. The practice has three offices. The head office in Derby houses the administrative, and HR departments along with teams of structural, highway, drainage and environmental/geotechnical engineers. Projects in the South of the country are handled from the London office, which has a team of mainly structural and civil engineers. Specialist expertise is drawn from the Derby teams when it is required. The company also has an office in Birmingham to look after local interests there. The main board directors work in Derby and a regional manager looks after the London office. The practise employs nine Chartered Engineers including three fellows of the engineering institutions. Current projects include high rise blocks of apartments, up to 10 stories with 2 storey underground car parks, prestigious residential developments in London, A town centre redevelopment, trade parks, housing estates, leisure premises, a university buildings, a theatre, remediation of brownfield sites, roads and bridges. All offices are fully equipped with up to date IT equipment and software. For the larger projects full 3D modelling is used for both draughting and design ensuring economy of design and reliability of working documentation. The Derby office is ISO 9001 registered. All drawings are now prepared in digital form using Autocad 2004 and along with all other project specific documentation, archived in digital form. David Wadsworth is a Chartered Engineer and runs the London office for Rodgers Leask Ltd. He first introduced ESA-Prima Win to the practice and has encouraged its use both in his own office and in Derby. The project involves the construction of a new building on the site of existing industrial units and Victorian buildings. It will be of mixed residential and office use. The area of building fronting onto Blackheath Road will be just under 4000m² of offices. The rear part and the wings include 84 residential 1 and 2 bedroom apartments. The scheme is an extension to the successful Deals Gateway development adjacent to the site, which is already substantially occupied with just the last phase under construction. Phase 1 of the development is to start on site early 2005 with phase 2 commencing in 2006. The scheme comprises the construction of a 10 storey building, sitting on a 2 storey basement car park. The superstructure is to be on 3 sides of a ground level podium. The basement is to link with a similar building currently under construction on the adjacent Deals Gateway Site. The site is a reasonably level urban brownfield site and overlies a major chalk aquifer some 10m below ground level. The basement will be smaller than the footprint of the building to allow open cut techniques to be used in its construction. The basement slab itself will act as a raft foundation supported in dense sands and gravels overlying chalk. The building around the basement will be on piles deriving both end resistance and skin friction in the same stratum. The basement will be reinforced concrete, tanked to category 2 water and vapour protection. Reinforced concrete cores and columns will strike off the basement slab and rise up through the superstructure. The entire superstructure will be designed as a braced structure with stability forces being transmitted to the cores and shear walls via flat slabs at each level. Slabs in the commercial areas will be 275mm and in the residential areas 225mm thick. Column positions are optimised to fall within the party walls of the apartments and between car parking bays within the basement. There is a transfer beam at 1st floor level where column positions cannot run through. The entire structure has been modelled using ESA-Prima Win 3D modelling software. Loads include various permanently applied dead loads from finishes, allowances for internal partitions; patch loads for bathroom pods; line loads from external walling; plant loads on the roof; imposed floor loads; snow and wind loads. Floor slabs have been designed without column heads or drops, and punching shear checked by ESA-Prima Win. A 1m mesh has been adopted for the FEM analysis with a finer mesh at critical areas of stress concentration. Sensitivity checks were run on the raft design to check for the effect on contact stresses and forces of a range of soil subgrade spring values. Rodgers Leask has used ESA-Prima Win on several similar projects but Phase 2 of Blackheath Road project is the largest structure analysed and designed from one model. Modelling FE software was chosen for its ability to accurately analyse irregular shaped slabs on a non-regular pattern of supports. The need to keep the structure as slender as possible to optimise storey heights and structural supports has necessitated the careful prediction of the distribution of stability and lateral loads between the cores, shear walls and columns. Accurate prediction of slab edge deflections has been necessary as part of the lightweight cladding design and detailing. 126 Company Project Blackheath Road, Phase 2 Rodgers Leask Ltd SCIA User Contest 2005 / Commercial and industrial building 3 Categorie
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