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The existing building consists of traditional filler joints, floor slabs supported on steel beams with cast-iron columns internally and loadbearing masonry walls externally. Floors generally span 4.0m with columns at 4.0m or 8.0m centres. A survey of the building and load testing of the floors established the extent of remedial/strengthening works required. Proposed alterations included the replacement of the main spine wall by rigid steel frames which incorporate circular hollow section ...

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