Dynamic modelling of post-tensioned concrete floors using finite element analysis

摘要

The only existing guidelines developed specifically for checking the vibration serviceability of slender post-tensioned concrete floors, which are simplified and suitable for hand calculations, have proved to be unreliable. The alternative approach recommended here for checking the vibration serviceability of such floors with high span-to-depth ratios is based on dynamic finite element modelling. This paper presents an experimentally verified set of guidelines for performing such modelling. In particular, it is recommended that band beams and wide, shallow ribs, which are common features in long-span in situ cast post-tensioned floors, are modelled using orthotropic shell elements with smeared stiffness propertiess, instead of standard beam elements.