View source for Video case studies

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This series of ‘Framed in Steel’ video case studies covers notable recent steel building and bridge projects. Interviews with the participants interspersed with footage of the structure are used to describe the project in general terms encompassing the client’s aims, [[Design|design]] drivers and challenges faced during [[Construction|construction]]. Clients, architects, engineers and contractors give their views on what each project represents for them, what’s important, why steel was used and how steel helped to achieve the client’s objectives.

==The Walbrook Building, London==
{{#image_template:image=File: Walbrook_Building.jpg|caption=[[The Walbrook Building, London|The Walbrook Building, London]]|align=right|wrap=true|width=300}}
Incorporating some large open trading floors, the Walbrook marks the latest in design development of [[Multi-storey office buildings|office buildings]] for the City of London. Built on a City of London site directly opposite Cannon Street Station, the 10 storey Walbrook Building is an L shaped structure providing 3,693m<sup>2</sup>  of retail space and 35,283m<sup>2</sup>  of office floor space.
 
The project required more than 6,000t of [[Steel construction products|structural steelwork]] and is located within the height limitation band imposed by the nearby St Paul’s Cathedral. The structure consists of steel columns and beams with [[Composite_construction#Composite_slabs|composite floor slabs]] cast in situ on [[Steel_construction_products#Decking_for_floors|metal decking]], with [[Steel_construction_products#Cellular_beams|cellular beams]] used extensively throughout to [[Service integration|accommodate services]]. In order to create the desired open plan column free spaces, the steelwork is based around a 9m grid pattern, with only 10 internal columns on a typical floor plate.
 
{|class="wikitable"  width=400
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|'''Architect'''||Foster + Partners
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|'''Structural engineer'''||Arup
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|'''Steelwork contractor'''||William Hare Ltd
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|'''Main contractor'''||Skanska UK Plc
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|'''Client'''||Minerva Ltd
|}

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==The Co-operative Group Head Office, Manchester==
{{#image_template:image=File: Coop_HQ.jpg|caption=[[The Co-operative Group head office, Manchester|Co-operative Group Head Office, Manchester]]|align=right|wrap=true|width=300}}
Founded in 1863, the Co-operative Group has always had its headquarters in Manchester and is continuing its commercial contribution to city life by constructing a brand new 16-storey headquarters. The building represents the first phase in the redevelopment and regeneration of the Group’s 20-acre site, and will include around 30,000m<sup>2</sup> of open plan office space, providing modern working facilities for the Co-op’s staff. The client wants the project to be a sustainable landmark by becoming the first building in Manchester to achieve a [[Sustainability#BREEAM|BREEAM]] ‘Outstanding’ rating and so becoming a benchmark for the [[Multi-storey office buildings|commercial sector]].  [[Thermal mass]] and a [[Facades_and_interfaces#Double_fa.C3.A7ade_systems|double façade system]] are utilised to minimise [[Sustainability#Operational_carbon|operational energy]] requirements. 

Architecturally, the structure is far from being run-of-the-mill. Its footprint is a triangle with three rounded corners, giving the building a guitar plectrum shape. Each of the corners has a core, two of which rise up to level 11, with the third core extending up to the penultimate level 15. The building’s overall architectural orientation is completed by its sloping upper levels. From the ninth floor the levels step back and are terraced, topping out at the 16th floor core area. The centre of the building is hollow, as a large triangular atrium extends from ground floor all the way up to a sloping roof, a glazed structure that follows the line of the ninth floor to 16th floor terracing.

{|class="wikitable"  width=400
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|'''Architect'''||3D Reid
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|'''Structural engineer'''||Buro Happold
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|'''Steelwork contractor'''||Severfield (NI) Ltd
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|'''Main contractor'''||BAM Construction
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|'''Client'''||Co-operative Group
|}

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==Peace Bridge, Derry-Londonderry==
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The Peace Bridge in Derry-Londonderry has quickly become a symbol of recent political and cultural changes in Northern Ireland. Connecting two historically divided communities on the east and west banks of the River Foyle, it is an aesthetically pleasing expression of the unification of the city.
 
The structure is a 312m long S-shaped self-anchored [[Bridges#Suspension_bridges|suspension bridge]] for pedestrians and cyclists, divided in half with each portion supported from a single 38m high inclined steel pylon. At the centre of the river these systems cross over to form what has been called a symbolic handshake
 
The bridge deck is an orthotropic steel triangular [[Box_girder_bridges#Steel_box_girders|box section]], [[Fabrication|fabricated]] from painted [[Weathering steel|weathering steel]] and stiffened both longitudinally and transversely. The width of the deck varies, from 3.5m at the ends to 4.5m at pier locations. An array of hanger rods, comprising of helically spun spiral strands, supports the deck at one edge only. They are spaced along the concave edge at approximately 4.5m centres.
 
{|class="wikitable"  width=400
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|'''Architect'''||Wilkinson Eyre Architects
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|'''Structural engineer'''||AECOM
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|'''Steelwork contractor'''||Rowecord Engineering Ltd
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|'''Main contractor'''||Graham Construction
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|'''Client'''||Ilex Urban Regeneration Company
|}

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==NEO Bankside, London==
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Representing a considerable engineering challenge, the NEO Bankside development consists of four concrete framed residential pavilions each featuring a perimeter steel [[Braced_frames#Bracing_systems|bracing system]]. The systems serve three key purposes: to provide lateral and overall stability; to reduce the requirement for shear walls allowing greater internal flexibility, and to provide support for the winter garden elements at the prows of the buildings.
 
Stability forces are transferred into the external perimeter bracing via nodes, which are arranged on a six storey interval vertically and on a sequenced interval horizontally. Prefabricated spindle and node [[Simple_connections#Fin_plates|fin plate]] assemblies were delivered to site on 4.5m long steel stanchions that were then embedded within the primary concrete columns. 

The bracing sections taper at their ends and attach to the node [[Simple_connections#Fin_plates|fin plates]] via cast fork ends, with close tolerance pins of up to 100mm in diameter. The colour of the external perimeter bracing was an important factor affecting the structural design, with implications to the range of thermal stresses and movements to which the system would be subjected. The external diagrid bracing system provides gravity load support to the promontory winter gardens at each end of the pavilions by utilising a system of external hangers or struts at their apexes.
 
{|class="wikitable"  width=400
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|'''Architect'''||Rogers Stirk Harbour + Partners
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|'''Structural engineer'''||Waterman Structures Ltd
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|'''Steelwork contractor'''||Severfield (UK) Ltd
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|'''Main contractor'''||Carillion
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|'''Client'''||GC Bankside LLP
|}

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==Siemens Facility, Lincoln==
{{#image_template:image=File: Siemens-1.jpg|caption=[[Siemens Facility, Lincoln]]|align=right|wrap=true|width=300}}
The new Siemens facility is situated on a landmark development, known as Teal Park, on the outskirts of Lincoln, and includes a three level 4,500m<sup>2</sup> [[Multi-storey_office_buildings|office building]], adjacent to a 7,300m<sup>2</sup> [[Single_storey_industrial_buildings|service workshop]]. Both are structurally independent steel framed buildings, [[Construction#Steel erection|erected]] during a nine week programme which completed in March 2012. Structural steelwork was chosen for this project for a number of reasons, such as [[The_case_for_steel#Speed of construction|speed of construction]], the long spans required in the workshop and the [[The_case_for_steel#Economics|economy of construction]].
 
The three level [[Multi-storey_office_buildings|office building]] is approximately 100m long by 15m wide, and split into three zones by two [[Concept_design#Concrete or steel cores|braced cores]]. Steelwork is based around a regimented 7.5m x 6m [[Concept_design#Floor grids|grid pattern]], which will give the offices an open plan feel as there is only one internal column line.
 
The 30m high [[Single_storey_industrial_buildings|workshop]] has a footprint of approximately 100m × 100m. Structurally it is a battened [[Portal_frames|portal frame]] with four 23m wide spans, each of which will accommodate overhead gantry cranes.  Supporting the crane beams are a series of 7.5m high welded double lattice columns, spaced at 9m centres and[[Fabrication#Handling and transportation| brought to site]] as fully assembled members. In order to limit deflections each of the lattice column’s base plates includes a [[Moment_resisting_connections#Column bases|moment connection]].

{|class="wikitable"  width=400
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|'''Architect'''||Stephen George & Partners
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|'''Structural engineer'''||Alan Brough Associates
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|'''Steelwork contractor'''||Hambleton Steel
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|'''Main contractor'''||Bowmer & Kirkland
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|'''Client'''||St Modwen
|}

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==Isaac Newton Academy, Ilford==
{{#image_template:image=File:Isaac_Newton-1.jpg|caption=[[Isaac Newton Academy, Ilford|Isaac Newton Academy]]|align=right|wrap=true|width=300}}
Isaac Newton Academy in Ilford, east London, is a £30 million, 1,250-pupil [[Education_buildings|secondary school]] specialising in maths and music, which opened in September 2012.

A key feature of the solution proposed for this tightly constrained site was a double height “sports beam”, projecting 55.8m out of the main building beyond the school’s original site boundaries and over an adjacent car park. This allowed the architects to provide the other school facilities in an interlocking four-storey main block, permeated with outdoor space in the form of courtyards to bring in natural daylight to as many rooms as possible.

Structural steelwork was chosen for this project for a number of reasons, such as [[The_case_for_steel#Speed of construction|speed of construction]], the [[Long-span_beams|long spans]] required in the “Sports beam” and the [[The_case_for_steel#Economics|economy of construction]]. [[Thermal mass]] is utilised via exposed [[Floor_systems#Precast units|precast slabs]] on the [[Braced_frames|steel frame]], and the new building has a super-insulated, high-performance [[Facades_and_interfaces|envelope]] to reduce energy demands. A particularly challenging part of the [[Design|design]] was the dynamic loading in the sports hall, where the [[Long-span_beams|long span steel beams]] were designed to minimise [[Floor_vibrations|floor vibrations]].

The frame comprises 1,269 tonnes of steel with nearly 2,000 pieces bolted together using [[Simple_connections|simple connections]] to speed up the [[Construction#Steel erection|erection]]. The steelwork is protected with [[Fire_protecting_structural_steelwork#Intumescent Coatings|intumescent coating]], where needed, to give four hours of [[Structural_fire_resistance_requirements|fire protection]].

{|class="wikitable"  width=500
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|'''Architect'''||Feilden Clegg Bradley Studios
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|'''Structural engineer'''||Skanksa
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|'''Steelwork contractor'''||William Hare
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|'''Main contractor'''||Skanksa
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|'''Clients'''||London Borough of Redbridge and ARK Schools
|}

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==20 Fenchurch Street, London==
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There is a new landmark structure in the City of London. 20 Fenchurch Street (dubbed the Walkie Talkie) enhances a skyline that has altered continuously over the years, as this 38 storey tower has an iconic and unique structural shape. From a relatively narrow base the building gradually flares outwards providing larger floor plates on the upper levels. Each floor has a unique size and the final office level 34 achieves an impressive increase in floorspace of up to 60%. Topping off the structure is a fully enclosed sky garden that includes catering facilities as well as 360 degree views over the capital.
 
The project required more than 8,200t of [[Steel construction products|structural steelwork]], which equates to some 4,500 separate sections. The largest steel members to be lifted into place were also the longest beams at 15m and weighing 9t each. A large number of the main floor beams are [[Steel_construction_products#Cellular beams|cellular members]], used for their efficiency and [[Service_integration#Cellular beams|service openings]]. To [[Construction#Steel erection|erect]] the outer cranked columns, William Hare utilised a bespoke spigot that was [[Welding|welded]] to the top of each column, which allowed the column above to be placed at the correct angle. 

{|class="wikitable" width=400
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|'''Architect'''||Rafael Viñoly Architects
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|'''Structural Engineer'''||Halcrow Yolles
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|'''Steelwork Contractor'''||William Hare
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|'''Construction Manager'''||Canary Wharf Contractors<br>(subsidiary of Canary Wharf Group)
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|'''Developers'''||Land Securities, Canary Wharf Group
|}

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==Derby Arena==
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The Derby Arena was one of the first Olympics legacy projects to get under way following last year’s Games. The three-storey multi-sports [[Leisure_buildings#Indoor arenas|arena]] will contain a main sports hall the size of 12 badminton courts at ground floor, a 250m national standard indoor cycling track on the first floor and fitness studios and offices on the second floor. Plant and meeting rooms occupy the third floor. The centre of the track is open to the main sports hall below. This layout allows the [[Leisure_buildings#Indoor arenas|arena]] the flexibility to be used as a 5,000-seater concert venue as well as for sports.

Designed by architect FaulknerBrowns, the [[Leisure_buildings#Indoor arenas|arena]] building is diamond-shaped with chamfered corners, and features pre-cambered 84 m long [[Trusses|trusses]] at roof level over the main hall area.

With so much of the building being [[The_case_for_steel#Offsite fabrication for precision parts|manufactured offsite]] – the 700t of steelwork, [[Floor_systems#Precast units|precast floors]], stairs and terracing – the quality of finish will be high, but to keep on [[Construction#Construction sequence|programme]] the contractor has had to keep a strong focus on site progress and timing deliveries correctly.

[[Derby_Arena.|Derby Arena]] was an 'Award' winner in the [[Structural_steel_design_awards#Structural_steel_design_awards_2015|Structural Steel Design Awards 2015]]

{|class="wikitable" width=400
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|'''Architect'''||FaulknerBrowns
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|'''Structural Engineer'''||Arup
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|'''Steelwork Contractor'''||Billington Structures
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|'''Main Contractor'''||Bowmer and Kirkland
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|'''Client'''||Derby City Council
|}

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==First Direct Arena, Leeds==
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The £60M First Direct Arena is a unique 13,500 capacity music venue built on a constricted site, bounded by residential accommodation and the Leeds Inner Ring Road. It is the most sustainable [[Leisure_buildings#Indoor arenas|arena]] in the UK and a striking landmark structure that combines innovative features to optimise audience experience with extreme restrictions on noise breakout to minimise any impact on neighbouring residents.

Creating the arena’s large clear spans demanded a steel solution and a total of 13 [[Trusses|trusses]] spanning up to 72m were installed. Innovation and collaboration between project team members enabled an increase in truss depth to minimise weight whilst still maintaining the same overall depth of the roof zone.

{|class="wikitable" width=400
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|'''Architect'''||Populous
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|'''Structural Engineer'''||Arup
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|'''Steelwork Contractor'''||Severfield (NI) Ltd
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|'''Main Contractor'''||BAM
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|'''Client'''||Leeds City Council
|}

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==Other case studies – by sector==
*[[Multi-storey office buildings#Case studies|Multi-storey office buildings]]
*[[Single storey industrial buildings#Case studies|Single storey industrial buildings]]
*[[Retail buildings#Case studies|Retail buildings]]
*[[Healthcare buildings#Case studies|Healthcare buildings]]
*[[Education buildings#Case studies|Education buildings]]
*[[Leisure buildings#Case studies|Leisure buildings]]
*[[Residential and mixed-use buildings#Case studies|Residential and mixed-use buildings]]
*[[Bridges#Case studies|Bridges]]

[[Category:Construction News]]