Vibration from a number of sources, such as air handling units, was considered in the structural design process. The result of the preliminary design was a robust steel frame utilising a 225mm composite concrete/profiled metal deck floor slab spanning between composite primary and secondary beams. "By using 225mmthick slabs we were able to provide floor beams with a high natural frequency and a slab with inherent mass to damp induced vibration," says Mr Garland. "It was essential to maintain standard grid arrangements with continuous lines of secondary beams to promote the mobilisation of large areas of floor plate and increase the modal mass for vibration damping."
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