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Compusoft Engineering Ltd was charged with completing a detailed seismic assessment of a structure in Auckland. CSI was engaged by the building owner and Compusoft were the consultant engineers in the project.
The building has multiple stories and was constructed utilising reinforced concrete construction and the recorded drawings gave the option to use either discrete bars or non-ductile mesh to reinforce the floor diaphragm. However, there was no record of what was used in the as-built construction.
The original assessment identified some deficiencies in the seismic resisting system that would require retrofit strengthening.
Due to the ambiguity and uncertainty in the construction details, CSI was engaged to scan and confirm the reinforcement present.
The key focus was to confirm that the ‘as-built’ reinforcement detail in the slab was in place, as this would influence the extent of strengthening required.
Through scanning of the floor, it was established what reinforcement was used in the floor diaphragms. Scanning also identified variances in the as-built construction from that detailed in the record drawings. In particular, CSI was able to confirm that a number of starter bars were not installed as required.