APPENDIX 13.5 STRUCTURAL APPRAISAL

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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
3 Condition Of Structure The steel structure generally appears to be in a good condition with only the exposed end frame to the rear of the building showing any signs of corrosion (photos 9 & 10). This frame is on the external side of the rear masonry wall and is heavily corroded at both connections to the ground floor slab. The internal frames, purlins and bracing are not showing any significant signs of corrosion. Two areas of minor mechanical damage to the main frames were seen at high level, see photographs (photos 11 & 12) 24540241 Chertsey Building 10 3
Page 1 and 2: APPENDIX 13.5 STRUCTURAL APPRAISAL
Page 3 and 4: QM Issue/revision Issue 1 Revision
Page 5: 1 Introduction WSP were appointed t
Page 9 and 10: 5 Re-Erecting Frame New foundations
Page 11 and 12: 7 Conclusion In conclusion it is re
Page 13 and 14: Photo 1 - Front elevation Photo 2 -
Page 15 and 16: Photo 5 - Diagonal bracing to front
Page 17 and 18: Photo 9 - Corrosion to rear frame b

APPENDIX 13.5 STRUCTURAL APPRAISAL

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