Unsupported browser

For a better experience please update your browser to its latest version.

Your browser appears to have cookies disabled. For the best experience of this website, please enable cookies in your browser

We'll assume we have your consent to use cookies, for example so you won't need to log in each time you visit our site.
Learn more

A trussed girder structure with canted supports

  • Comment

A framework of tubular trusses with canted supports rests on a solid mezzanine floor. Both are visible through the two-storey glazed facade of the 20 x 40m pumping station.

The structure was designed as a delicate filigree of steel tubes, which would clearly indicate the line of forces. It consists of four triangulated truss girders, each measuring 1.3m deep and spanning 20m, which support a steel/concrete composite roof. The paired top booms and bottom boom (168.3mm diameter CHSs) are connected by canted 114.3mm diameter CHS props.

The load from the roof is transferred to the trusses by 168.3mm diameter CHS compression members. These are coupled to the top and bottom chords of the trusses by 40mm diameter steel tension rods, creating a cantilever action on both sides of the truss.

Each truss is supported at its ends by two pairs of canted 193.7mm diameter CHS legs, which rest on floorplates alongside the glass facade. The plates also act as fixing points for a pair of vertical tension rods, which transfer loads from the top chords of the truss down to the concrete floor. The plates are positioned on concrete pockets to distribute the additional horizontal force component from the diagonal legs, through the concrete table and sheer walls, down to the concrete slab below ground. As some of the sheer walls did not match the position of the legs, loads were modelled on a computer program.

The roof consists of 180mm deep in-situ concrete cast on a profiled steel deck. At the perimeter, the roof is supported by a 300mm deep universal beam, which is bolted to the top booms of the trusses. To reduce the level of noise from the pumps, the roof and the facade are separated from the supporting structure by elastomeric anti-vibration bearings.

  • Comment

Have your say

You must sign in to make a comment

Please remember that the submission of any material is governed by our Terms and Conditions and by submitting material you confirm your agreement to these Terms and Conditions.

Links may be included in your comments but HTML is not permitted.

Related Jobs

AJ Jobs