Crossrail Station Canary Wharf in London, United Kingdom
A unique timber structure has been located in the heart of London since the end of March 2014. In a period of just six months, the Austrian company WIEHAG built the roof with a total length of 984.2 feet for the Crossrail railway station situated in the Canary Wharf business district.
Planning, Analysis, and Construction of Roofing
Overall Project Engineering
Foster + Partners
Adamson Associates Architects
Canary Wharf Contractors Ltd
Crossrail is a railway and infrastructure construction project in Greater London, which is to be completed by 2018. The cost for the entire project with its route network, which is about 62 miles long, is estimated at approximately 18 billion euros.
WIEHAG was not only responsible for the construction work, but also for the planning and structural analysis of the timber grid roof. The structural analysis of the structure, with a total of 1,414 glulam timber members as well as 111 steel pipes, was performed in RSTAB.
In its cross‑section, the roof structure of the station building can be described as a semi‑ellipse. The arc spans freely over a width of about 102 ft Coupled triangles form the mesh structure of the load‑bearing shell. With a regular grid of 19.6 ft, the timber structure is supported at the nodal points.
At both ends of the longitudinal sides, the roof cantilevers a spectacular 98.4 ft over the water surface. There, round steel pipes running parallel to the diagonal timber beams form the end of the roof. These so-called end ring beams are double curved and have an architectural function in addition to strengthening the structure.
One major engineering challenge was the design of the nodal points consisting of steel. They were represented and calculated as finite element models in RFEM.
The structural steel parts had to be made with a high degree of accuracy in order to keep the tolerance compensation as low as possible at the construction site.
The roof covering consists of membrane cushions. In the central area, however, the roof is open to facilitate the natural watering of a park created inside.
The Crossrail station in Canary Wharf is one of the largest timber construction projects in Great Britain. With this building, London receives another architectural highlight.
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Compared to the RF‑/TIMBER Pro add-on module (RFEM 5 / RSTAB 8), the following new features have been added to the Timber Design add-on for RFEM 6 / RSTAB 9:
- In addition to Eurocode 5, other international standards are integrated (SIA 265, ANSI/AWC NDS, CSA 086, GB 50005)
- Design of compression perpendicular to grain (support pressure)
- Implementation of eigenvalue solver for determining the critical moment for lateral-torsional buckling (EC 5 only)
- Definition of different effective lengths for design at normal temperature and fire resistance design
- Evaluation of stresses via unit stresses (FEA)
- Optimized stability analyses for tapered members
- Unification of the materials for all national annexes (only one "EN" standard is now available in the material library for a better overview)
- Display of cross-section weakenings directly in the rendering
- Output of the used design check formulas (including a reference to the used equation from the standard)
- I just have to calculate an open hall with low roof loads and, compared to them, relatively high wind loads. In theory, it is necessary to perform the lateral-torsional buckling design of the bottom flange. Unfortunately, the combination 1.0*G + 1.5*W is missing.
- How do I obtain the maximum column load in my RFEM 3D model?
- How can I neglect torsion in the steel and timber design?
- How do I perform stability analysis to determine the critical load factor in RFEM 6?
- Where can I find the materials for the corresponding National Annexes in RFEM 6 and RSTAB 9?
- How does the "Orthotropic Plastic" material model work in RFEM?
- What is the meaning of the superposition according to the CQC rule in a dynamic analysis??
- Can I use RFEM to calculate a log house three-dimensionally?
- How do I display some results of all load cases in the printout report, but other results of the selected load cases only?
- Can I design laminated veneer lumber with RFEM/RSTAB?
Programs Used for Structural Analysis
Structural engineering software for designing frame, beam, and truss structures, as well as performing linear and nonlinear calculations of internal forces, deformations, and support reactions
Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids, and contact elements