APPENDIX 13.5 STRUCTURAL APPRAISAL

2 Building Structure
The building is approximately 27.5m x 13.75m in plan and is arch shaped with a
maximum height of approximately 6.5m. The front and rear elevations consist of
brickwork walls with piers and inset doors (photos 1 & 2). Large folding doors are
situated in the front elevation of the building with a smaller standard access door to the
rear.
The structure of the building consists of 7 number steel arch frames at approximately
3.0m centres, spanning from one side to the other down to ground level. The frames are
made up of sections of curved lattice beams approximately 3.8m in length made from
steel flange plates and lattice rods connecting the plates. The sections are bolted
together to form the arch shape of the building. Purlins are bolted to the tops of the main
frames which in turn support the corrugated metal roof and ceiling.
The stability of the structure is achieved by diagonal bracing at the front and rear of the
building in the plane of the arch. Loads are transferred through the structure using
purlins and longitudinal bracing. Both bracing and purlins are made from steel angles
measuring approximately 50mm x 50mm, (photos 3, 4 & 5).
The ends of each of the steel arches are restrained at ground level with horizontal lattice
beams fixed to the ground floor slab and with angles which appear to be cast into the
foundation below the slab (photo 6). Vertical lattice columns provide additional support
to reduce the effective length of the arches.
The ends of the building are constructed from brickwork walls which support the doors
as mentioned above. The building also has some 2.5m high free standing dividing walls
in two corners which create sectioned off areas within the main building (photo 7).
The floor construction is a concrete slab with raised areas to both sides made up with a
concrete screed. This screed partially encases the ground level steel lattice beams
(photo 8).
24540241 Chertsey Building 10 2