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The long term instrumentation of the NMIT arts building – Expan shear walls

Hugh Morris, Maggie Zhu and Michelle Wang

The NMIT Arts building completed in 2011 in Nelson is the first three storey building using Expan type technology with energy dissipating rocking shear walls constructed from laminated veneer lumber (LVL). The long term wall post tensioning, wall shortening, and concrete composite floor deformations have been evaluated in more detail from April 2011 until October 2011. An overview is given of the building and overall instrumentation systems. Detail is given on the long term instrumentation on-site data logging systems, data transfer, Auckland monitoring equipment, data extraction and development of the web interface. The instrumentation is temperature sensitive but gross variations are predictable and corrected. The data will provide further opportunity to investigate hygro-thermal response. Preliminary results for the rate of compressive deformation were 0.4 to 1.4 mm in five months till mid October 2011 and the post tension loss is between 8 and 14.5 kN over the same five months. The post-tension losses since June 2010 vary from 13.9 to 20.6%.

TDJ 20/1

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