Post-Fire Evaluation of the New Zealand International Convention Centre.

In October 2019, the largest fire in a commercial building in New Zealand since 1947 burned for over ten days through the roof and upper floor of the 120 m wide × 100 m long New Zealand International Convention Centre, which was under construction and nearing completion at the time. The steel composite and reinforced concrete framed building features five storeys above grade of structural steel framing with composite floors, comprising heavy, intricate steel work that was impacted by the fire. The main steel structure performed very well in response to fire exposure ranging from low to severe, with minimal damage and distortion to the heavy steel roof members in general, considering the severity of the fire. Secondary steel angles, tubular steel, and wide-flange members at the roof elevation were locally more heavily distorted. A very detailed post-fire evaluation of the structure was carried out, comprising mapping of the fire effects, deflections, metallurgical changes, extensive numerical modelling, and full scale in-situ experimental testing. The outcome resulted in retention of over 95% of the total roof steelwork (2500 tonnes). This paper provides an overview of the fire and the key steps involved in the post-fire structural evaluation of this unique fire case history. [ABSTRACT FROM AUTHOR]