Vibration monitoring and condition assessment of the University of Sheffield Arts Tower during retrofit

Abstract

The 78 m Arts Tower at the University of Sheffield was refurbished during the period 2009–2011, with improvements that included replacement of facades and partitions. The structural changes were reflected in changes in dynamic properties that were tracked by a combination of long-term acceleration monitoring and vibration tests to identify local and global vibration modes. The global horizontal plane modes of the building were correlated with finite element model simulations and real-time automated operational modal analysis to characterize the effects of the structural changes on horizontal vibration modes in sway and torsion. In addition, floor vibration tests linked to the finite element simulations identified the contribution of ‘non-structural partitions’ on the floor dynamic performance. Replacement of heavy masonry partitions with modern lightweight forms has resulted in reduction of stiffness, yet there is no obvious change in sway vibration serviceability and floor performance remains satisfactory.